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1 | Which of the following best describes a fractional pitch coil in an electrical machine? |
A | The coil covers more than two poles |
B | The coil span is less than the pole pitch |
C | The coil span is greater than the pole pitch |
D | The coil span is equal to the pole pitch |
| 2 | Fires involving materials such as paper, wood, and textiles fall under which fire classification? |
| A | Class A |
| B | Class B |
| C | Class C |
| D | Class F |
| 3 | What is the primary principle by which an electric stove generates heat for cooking? |
| A | Chemical reaction |
| B | Electromechanical conversion |
| C | Electromagnetic induction |
| D | Resistive heating |
| 4 | At absolute zero temperature, how does an undoped (intrinsic) semiconductor behave, and what does this imply for its use in electronic devices? |
| A | Insulator - making it unsuitable for conduction without doping or heat |
| B | Perfect diode - enabling unidirectional current flow at zero voltage |
| C | Superconductor - allowing perfect current flow with zero resistance |
| D | Conductor - making it ideal for low-resistance wiring |
| 5 | When is mouth-to-nose artificial respiration most typically administered? |
| A | When the mouth is injured or cannot be opened |
| B | When the person's nose is blocked due to injury |
| C | When the casualty is unconscious but breathing normally |
| D | When there is an abdominal injury |
| 6 | What is the correct expression for the reduction factor in illumination? |
| A | 1 / MSCP |
| B | MHCP / MSCP |
| C | MSCP / MHCP |
| D | 2 x MSCP / MHCP |
| 7 | In a nuclear power plant, what is the primary function of the reflector? |
| A | Decrease the efficiency of chain reaction. |
| B | Bounce back most of the neutrons that escape from the fuel core. |
| C | Decrease the speed of neutrons. |
| D | Cease chain reaction. |
| 8 | A group of molecules possessing an electric charge is known as: |
| A | Electron |
| B | Nucleus |
| C | Proton |
| D | Ion |
| 9 | The peak-to-peak value of a sinusoidal voltage with an average value of 200 V is approximately: |
| A | 141.4 V |
| B | 282.8 V |
| C | 628.3 V |
| D | 400 V |
| 10 | If the frequency is fixed, the torque of an induction motor is proportional to: |
| A | Applied voltage |
| B | Square root of the applied voltage |
| C | Square of the applied voltage |
| D | Cube root of applied voltage |
OHPC DIPLOMA QUESTION PAPER
| 11 | Which of the following elements must be added to pure germanium to create a P-type semiconductor? |
| A | Indium |
| B | Bismuth |
| C | Arsenic |
| D | Nitrogen |
| 12 | In a battery charging circuit, the RMS value of the half-wave rectified current is found to be 6 A. To improve efficiency, the system is upgraded to use a full-wave rectifier. What will be the new RMS value of the rectified current, assuming the same peak input current? |
| A | 6.25 A |
| B | 7.5 A |
| C | 8.49 A |
| D | 10.62 A |
| 13 | The primary factor affecting the insulation strength of an Extra High Voltage (EHV) transmission line is: |
| A | Switching overvoltages |
| B | Corona |
| C | Sag |
| D | Load power factor |
| 14 | Which of the following factors has the least effect on the sag of a transmission line? |
| A | Atmospheric temperature |
| B | Current through the conductor |
| C | Ice deposition |
| D | Wind pressure |
| 15 | Which of the following statements about battery charging methods is most correct? |
| A | Constant current charging increases voltage exponentially during charging |
| B | Lithium-ion batteries should only be charged with constant current |
| C | Both CC charging and CV charging methods maintain exactly the same current throughout charging |
| D | Constant voltage charging typically begins with a high current that gradually decreases |
| 16 | A backup power system uses a 160 Ah battery to supply power to a communication device during a power outage. If the system is designed to operate continuously for 20 hours, what is the average current drawn by the device from the battery? |
| A | 10 A |
| B | 16 A |
| C | 20 A |
| D | 8 A |
| 17 | Which of the following is not an advantage of a star connection in electrical systems? |
| A | It allows longer cable lengths without signal degradation |
| B | It is ideal for unbalanced loading |
| C | It requires fewer turns for the same voltage compared to delta connection |
| D | It is suitable for high-voltage applications |
| 18 | A three-phase, 6-pole, 50 Hz induction motor develops maximum torque at 960 rpm. The rotor resistance per phase is 0.25  . What is the standstill rotor reactance? |
| A | 3.15 |
| B | 0.266 |
| C | 1 |
| D | 6.25 |
| 19 | According to Rule No. 88 of the Indian Electricity Rules, what action should be taken when the electrical continuity of a guard wire is broken? |
| A | The break can be ignored if it does not pose immediate danger. |
| B | The guard wire should be replaced immediately and entirely with a new one. |
| C | Every guard-wire should be connected with earth at each point at which its electrical continuity is broken. |
| D | The entire electrical system should be shut down until the guard wire is repaired. |
| 20 | Kirchhoff's Current Law (KCL) is valid for analyzing current flow at junctions in which type of electrical networks? |
| A | All types of networks, regardless of their geometry |
| B | Only networks with at least one mesh |
| C | Only networks that can be drawn on a plane without crossing branches |
| D | Only symmetrical and balanced networks |
NCL 2020 QUESTION PAPER
| 21 | Which of the following statements about tidal barrage systems is correct? |
| A | Barrages allow unrestricted movement of marine life, ensuring no ecological disruption. |
| B | The salinity inside the tidal lagoon increases, attracting more marine organisms. |
| C | Barrages are cheaper to construct and maintain compared to single tidal turbines. |
| D | The turbines in a barrage generate power as water flows in during high tide and out during low tide. |
| 22 | Which part of a windmill acts as a housing for the turbine's key components? |
| A | Shaft |
| B | Blade |
| C | Wind vane |
| D | Nacelle |
| 23 | A coil of 250 turns is linked with a magnetic flux of 0.01 Wb when it carries a current of 10 A. What is the inductance of the coil? |
| A | 0.15 H |
| B | 0.25 H |
| C | 0.5 H |
| D | 150 H |
| 24 | Two sinusoidal currents are given by: I1 = A sin (  t +  /4); I2 = B sin (t - /6).What is the phase difference between the two quantities (in degrees)? |
| A | 75o |
| B | 90o |
| C | 150o |
| D | 105o |
| 25 | Which of the following gases is typically used along with metallic sodium in a low-pressure sodium-vapour lamp? |
| A | Argon and neon |
| B | Nitrogen and xenon |
| C | Hydrogen and oxygen |
| D | Helium and krypton |
| 26 | What is the primary purpose of the bedding layer in underground cables? |
| A | To enhance signal transmission speed |
| B | To conduct electricity efficiently |
| C | To provide mechanical protection and cushion to the insulation |
| D | To reduce the resistance of the conductor |
| 27 | Three identical resistors of 6 ohms each are connected in series across a 60 V power supply and dissipate a total power of 200 W. What will be the total power dissipated if the same resistors are connected in parallel across the same 60 V supply? |
| A | 2400 W |
| B | 1800 W |
| C | 1200 W |
| D | 1500 W |
| 28 | The relative permeability of paramagnetic material is: |
| A | Much less than zero |
| B | Equal to unity |
| C | Less than unity |
| D | Greater than unity |
| 29 | On which principle does an RCCB operate? |
| A | Overload current |
| B | Overvoltage |
| C | Short circuit current |
| D | Residual current |
| 30 | The component responsible for generating eddy current damping in a PMMC (Permanent Magnet Moving Coil) instrument is the: |
| A | Permanent magnet |
| B | Moving coil |
| C | Aluminium former |
| D | Control spring |
LMRC QUESTION PAPER
| 31 | In an MCB, which components provide protection against overload and short-circuit currents respectively? |
| A | Fuse for overload and relay for short-circuit |
| B | Thermistor for overload and diode for short-circuit |
| C | Bimetal for overload and electromagnet for short-circuit |
| D | Bimetal for short-circuit and electromagnet for overload |
| 32 | What does Indian Electricity Rule 44 primarily deal with? |
| A | Maintenance of earthing pits |
| B | Guidelines for the installation of solar panel |
| C | Specifications for conductor size in domestic wiring |
| D | Instructions for restoration of persons suffering from electric shock |
| 33 | What does an integrating instrument measure? |
| A | Peak voltage |
| B | Instantaneous current |
| C | Power at a given moment |
| D | Total energy supplied over time |
| 34 | Star-Delta starting is approximately equivalent to autotransformer starting with which tapping percentage? |
| A | 58% of tapping |
| B | 25% of tapping |
| C | 78% of tapping |
| D | 52% of tapping |
| 35 | The Wheatstone Bridge is primarily used to measure which of the following quantities? |
| A | Resistance |
| B | Voltage |
| C | Inductance |
| D | Capacitance |
| 36 | Which of the following statements correctly describes the impact of transmission line parameters on voltage regulation? |
| A | Capacitance and shunt conductance cause voltage drop, improving voltage regulation. |
| B | Resistance and inductance contribute to voltage drop, reducing the receiving-end voltage. |
| C | Resistance and shunt conductance increase the receiving-end voltage under all load conditions. |
| D | Inductance and capacitance completely cancel each other, so voltage drop is negligible in long lines. |
| 37 | Which of the following correctly describes a Double Pole Double Throw (DPDT) switch? |
| A | It controls a double-throw single pole with two inputs |
| B | It operates two poles simultaneously with each pole switching between two terminals |
| C | It switches two double-pole lines directly without interruption |
| D | It connects a double circuit with a single throw in two directions |
| 38 | Which rule is used to determine the direction of the magnetic field produced by a current-carrying conductor? |
| A | Maxwell's right-hand thumb rule |
| B | Ohm's law |
| C | Helix rule |
| D | Fleming's right-hand rule |
| 39 | In underground transmission line systems, low tension (LT) cables are typically used for voltages up to: |
| A | 33 kV |
| B | 66 kV |
| C | 11 kV |
| D | 1 kV |
| 40 | What are the reflecting mirrors called that are used to concentrate solar energy by tracking the sun and directing sunlight onto a central receiver? |
| A | Core |
| B | Heliostats |
| C | Diffusers |
| D | Flat plate collectors |
| 41 | The Buchholz relay is typically used in which of the following equipment for protection purposes? |
| A | Potential Transformer (PT) |
| B | Current Transformer (CT) |
| C | Auto transformer |
| D | Power transformer |
| 42 | A 200 W television is used for 4 hours each day, and a 1000 W microwave oven is used for 30 minutes each day. What is the total energy consumed by both appliances in a 30-day month? |
| A | 39 kWh |
| B | 52 kWh |
| C | 45 kWh |
| D | 28 kWh |
| 43 | What is the spatial displacement between the main and auxiliary windings in a Capacitor Start Capacitor Run motor? |
| A | 90 degrees |
| B | 60 degrees |
| C | 45 degrees |
| D | 120 degrees |
| 44 | What is the characteristic of the output of a full wave rectifier circuit without a smoothing capacitor? |
| A | Pure DC voltage |
| B | Alternating voltage with the same frequency as input |
| C | Constant voltage with no variation |
| D | Pulsating DC voltage with reduced ripple compared to half wave |
| 45 | What is the primary function of an economiser in a steam power plant? |
| A | Preheat the feed water |
| B | Condense the steam |
| C | Reduce volume of the exhaust gases |
| D | Increase the speed of steam |
| 46 | Which type of insulator is commonly used at the dead end of a high-tension (HT) transmission line? |
| A | Pin insulator |
| B | Strain insulator |
| C | Suspension insulator |
| D | Post insulator |
| 47 | What is the permissible upper limit for voltage drop in an electrical installation from the supply point to any load point? |
| A | 10% of the rated voltage |
| B | 2% of the rated voltage |
| C | 5% of the rated voltage |
| D | 12% of the rated voltage |
| 48 | In an HRC (High Rupturing Capacity) fuse, which material is used to quench the arc quickly and prevent any fire hazard? |
| A | Manganese |
| B | Sodium |
| C | Neon |
| D | Silica |
| 49 | What is the primary purpose of a high-rate discharge tester for batteries? |
| A | To calculate the total charging time required for full capacity |
| B | To determine the specific gravity of the electrolyte solution |
| C | To evaluate the battery's voltage response under high-current load |
| D | To measure the electrolyte temperature during charging |
| 50 | The power factor of an alternator is primarily and directly influenced by its: |
| A | Speed |
| B | Load |
| C | Frequency |
| D | Prime Mover |
| 51 | Informative signs typically have which shape? |
| A | Hexagonal |
| B | Circular |
| C | Triangular |
| D | Rectangular |
| 52 | Which type of instrument is commonly used in an insulation megger? |
| A | Moving coil type instrument |
| B | Moving iron type instrument |
| C | Electrostatic type instrument |
| D | Hot wire type instrument |
| 53 | What is the primary objective of the National Electrical Code (NEC) 2011? |
| A | Safety of electrical installations and personnel |
| B | Increased transmission efficiency |
| C | Cheaper electricity rates |
| D | Proper licensing of electrical contractors |
| 54 | Which of the following power plants typically has the lowest initial (capital) cost of installation? |
| A | Diesel power plant |
| B | Hydroelectric power plant |
| C | Nuclear power plant |
| D | Thermal power plant |
| 55 | Among the following, which can be considered a typical efficiency range of a geothermal power plant? |
| A | 40% to 50% |
| B | 10% to 20% |
| C | 30% to 40% |
| D | 80% to 90% |
| 56 | How do the operating temperature and pressure levels of geothermal power plants typically compare with those of conventional thermal power plants? |
| A | They are slightly higher |
| B | They are generally lower |
| C | They are approximately the same |
| D | They are significantly higher |
| 57 | Which of the following is a key advantage of the Delta-Delta transformer connection? |
| A | It is used primarily for high-voltage transmission |
| B | It requires fewer turns per phase than a Y-Y connection |
| C | It cannot operate under unbalanced loads |
| D | It can continue to operate in open-delta mode if one transformer fails |
| 58 | What does step potential refer to in the context of substation earthing? |
| A | The potential difference between the feet of a person standing 0.5 meters apart on the ground during a ground fault |
| B | The potential difference between the hands while operating a grounded switch |
| C | The voltage between earth and neutral during a lightning surge |
| D | The voltage between two phases during a switching operation |
| 59 | In a DC machine, if the armature has 96 slots and the machine has 4 poles, what is the pole pitch in terms of armature slots? |
| A | 12 slots |
| B | 48 slots |
| C | 24 slots |
| D | 36 slots |
| 60 | The electric field across the surface of the charged conductor is ___________. |
| A | straight line |
| B | continuous |
| C | parabolic |
| D | discontinuous |
| 61 | Which of the following is not an advantage of a dry cell battery? |
| A | Consistent performance across all temperature extremes |
| B | Minimal risk of leakage because of gel/paste electrolyte |
| C | Stable voltage output during discharge cycle |
| D | High portability due to compact and lightweight design |
| 62 | What condition marks the completion of the temperature rise test for top oil in a transformer? |
| A | When the ambient temperature equals the oil temperature |
| B | When the inlet and outlet temperatures of the cooler are the same |
| C | When the oil temperature reaches 100oC |
| D | When the temperature increase is less than 3oC in one hour |
| 63 | Which of the following is not an advantage of a sodium vapor lamp? |
| A | High efficiency |
| B | High power factor |
| C | Longer life |
| D | Operating temperature is low |
| 64 | The lightning arrester primarily acts as a |
| A | Overload protection device |
| B | Current-limiting device |
| C | Voltage stabilizing device |
| D | Surge diverting device |
| 65 | What type of protection is primarily provided by the thermal element in an MCCB? |
| A | Short-circuit protection |
| B | Overload protection |
| C | Under-voltage protection |
| D | Ground fault protection |
| 66 | What is the Curie temperature in the context of ferromagnetic materials? | |
| A | The temperature at which electrical resistance becomes zero | |
| B | The temperature below which a material exhibits diamagnetism | |
| C | The temperature at which a material becomes superconducting | |
| D | The temperature above which a ferromagnetic material becomes paramagnetic | |
| Not Answered | ||
| 67 | Crossover windings are primarily used in: |
| A | Low-voltage windings of large power transformers |
| B | Transformer bushings and tap changers |
| C | High-voltage windings of small transformers |
| D | Dry-type transformers exclusively |
| 68 | What is the power factor of an AC circuit with an impedance of 16 , through which a current of 8 A flows, and which consumes an average power of 800 W? |
| A | 0.9 |
| B | 0.78 |
| C | 1 |
| D | 0.5 |
| 69 | Which of the following is the most widely used type of generator in wind energy generation units? |
| A | MHD generator |
| B | Propane generators |
| C | DC generator |
| D | Induction generator |
| 70 | What is the most effective way to indicate a battery's state of charge in lead-acid batteries? |
| A | Specific gravity of the electrolyte |
| B | Level of the electrolyte |
| C | Temperature of the electrolyte |
| D | Color of the electrolyte |
| 71 | A sinusoidal AC voltage with a peak-to-peak amplitude of 339 V is applied across a 150 resistor. What is the RMS current through the resistor? |
| A | 1.6 A |
| B | 0.8 A |
| C | 0.4 A |
| D | 0.5 A |
| 72 | In a hydroelectric power plant, where is the draft tube located? |
| A | At the beginning of the penstock |
| B | Between the turbine runner and the tail race |
| C | In between the penstock and runner |
| D | Near the surge tank |
| 73 | Which of the following represents the relation between the root mean square (RMS) value and the average value of current for a pure sine wave? |
| A | Irms=1.11xIavg |
| B | Irms=2.22xIavg |
| C | Irms=0.637xIavg |
| D | Irms=1.41xIavg |
| 74 | The combined inductance of two coils connected in series is 0.8 H when currents are in the same direction, and 0.3 H when in the opposite direction. If one of the coils has a self-inductance of 0.2 H, what is the mutual inductance between the coils? |
| A | 0.5 H |
| B | 0.15 H |
| C | 0.0125 H |
| D | 0.125 H |
| 75 | The number of discs in a string of insulators for 220 kV AC overhead transmission lines typically lies in the range of: |
| A | 22 to 25 |
| B | 7 to 9 |
| C | 12 to 15 |
| D | 19 to 22 |
| 76 | To compensate Ferranti effect in transmission lines, shunt inductors are switched on at: |
| A | Power station |
| B | Receiving end |
| C | Substation |
| D | Generating station |
| 77 | In the 5S methodology, which step is referred to as "Shine"? |
| A | Step -2 |
| B | Step -1 |
| C | Step -4 |
| D | Step -3 |
| 78 | An ammeter has a full-scale deflection of 50 mA. To extend its range to 500 mA, a shunt resistor is added. If the resistance of the ammeter itself is 1 ohm, what should be the resistance of the shunt resistor? |
| A | 0.342 |
| B | 0.111 |
| C | 0.626 |
| D | 0.266 |
| 79 | Twelve 2 V cells, each with an internal resistance of 0.2 , are connected in series and placed across a 10 load. What is the approximate current flowing through the circuit? |
| A | 2.86 A |
| B | 2.65 A |
| C | 1.24 A |
| D | 1.94 A |
| 80 | In cleat wiring systems, the maximum allowable spacing between two adjacent cleats should not exceed ______. |
| A | 0.95 meter |
| B | 0.6 meter |
| C | 1.5 meter |
| D | 1 meter |
| 81 | The resistance of a wire is 4.5 at 0oC. If the temperature coefficient of resistance is 0.004 /oC, what will be its resistance at 25 oC? |
| A | 8.95 |
| B | 7.25 |
| C | 4.95 |
| D | 2.25 |
| 82 | What does luminous intensity measure? |
| A | Luminous flux per unit area |
| B | Luminous energy emitted per second |
| C | Luminous flux per unit solid angle |
| D | Luminous power received by a surface |
| 83 | Which law explains the formation of heat due to the flow of electric current through a conductor? |
| A | Ohm's law |
| B | Joule's law |
| C | Kelvin's law |
| D | Faraday's law |
| 84 | An engineer is testing a 3-phase squirrel cage induction motor in a laboratory. The standstill (blocked rotor) impedance of the motor per phase is given as: Z2 = 0.32+j0.4 .At what value of slip will the motor produce maximum torque, assuming stator impedance is negligible? |
| A | 1 |
| B | 0.8 |
| C | 0.2 |
| D | 0.5 |
| 85 | What type of insulation material is commonly used in oil-cooled power transformers? |
| A | Fiberglass and epoxy resins |
| B | PVC sheets and synthetic polymers |
| C | Cellulosic material made from kraft wood pulp |
| D | Silicone-based rubber insulation |
| 86 | A center-zero ammeter is connected in the rotor circuit of a 4-pole, 60 Hz induction motor. The ammeter needle makes 30 oscillations per minute. What is the approximate rotor speed of the motor? |
| A | 2050 rpm |
| B | 1450 rpm |
| C | 1250 rpm |
| D | 1785 rpm |
| 87 | What is the effect of increasing the transmission voltage in a power system? |
| A | Insulation requirement reduces |
| B | Transmission efficiency reduces |
| C | Volume of the conductor material reduces |
| D | Percentage line drop increases |
| 88 | Which of the following is generally considered the cheapest system of electrical wiring? |
| A | Cleat wiring |
| B | Conduit wiring |
| C | TRS wiring |
| D | Cast capping |
| 89 | Which of the following is a disadvantage of using a delta-delta ( -) connected transformer compared to a star-star (Y-Y) connected transformer? |
| A | Each winding must handle full line voltage |
| B | Provides a neutral point for grounding |
| C | Requires less insulation and fewer turns |
| D | Allows continued operation if one transformer fails |
| 90 | Which of the following factors does not increase the strength of the magnetic field inside a solenoid? |
| A | Increasing the number of turns |
| B | Increasing the current through the solenoid |
| C | Increasing the length of the solenoid (for a fixed number of turns) |
| D | Using a soft iron (ferromagnetic) core |
| 91 | In a two-wire DC system with the midpoint earthed, which of the following is true about the configuration? |
| A | The midpoint is earthed to stabilize the potential, but no load is connected to it |
| B | The midpoint is earthed and used to supply low-voltage loads |
| C | Both conductors are connected to earth to balance the voltage |
| D | The system uses three conductors, with the middle one carrying return current |
| 92 | A single-phase transformer is rated at 500 kVA, 1100 V/440 V, 50 Hz. If the high-voltage (HV) winding has 300 turns, how many turns are there on the low-voltage (LV) winding? | |
| A | 100 | |
| B | 350 | |
| C | 120 | |
| D | 500 | |
| Not Answered | ||
| 93 | Which of the following statements correctly distinguishes an ELCB from an MCB? |
| A | ELCB is a manual switch; MCB is an automatic alarm device |
| B | ELCB detects overload; MCB detects ground voltage |
| C | ELCB protects against short circuits; MCB protects against earth leakage faults |
| D | ELCB responds to earth leakage; MCB responds to overcurrent and short circuits |
| 94 | What is the Stroboscopic Effect observed in fluorescent lamps? |
| A | A phenomenon causing moving equipment to appear stationary or slower than they actually are |
| B | A phenomenon where the lamp emits constant light without flickering |
| C | A method used to reduce energy consumption in lamp |
| D | A visual effect that increases the brightness of the lamp |
| 95 | Which of the following actions will increase earth resistance? |
| A | Connecting electrodes in parallel |
| B | Decreasing the plate area |
| C | Pouring water |
| D | Increasing the depth of electrode |
| 96 | How does a differential MCB detect faults in a circuit? |
| A | By comparing current between live and neutral wires |
| B | By monitoring the power consumption of the circuit |
| C | By sensing high temperature in the wires |
| D | By measuring voltage drop across the load |
| 97 | What is the most effective control in the hierarchy of hazard control? |
| A | Administrative controls |
| B | Engineering controls |
| C | Use of personal protective equipment |
| D | Elimination of the hazard |
| 98 | What is the direct result of the water hammering process in penstocks of a hydroelectric power plant? |
| A | Increased turbine efficiency |
| B | Sudden rise in pressure within the penstock |
| C | Continuous flow of water to the turbine |
| D | Reduction in water pressure |
| 99 | A battery is constructed by linking six cells in series, where each cell provides 2 volts and can deliver a current of 4 amperes. What is the total voltage and current that this battery can supply? |
| A | 24 V, 8 A |
| B | 24 V, 4 A |
| C | 12 V, 8 A |
| D | 12 V, 4 A |
| 00 | Electrolytes are poor conductors of electricity in their solid state but become good conductors in: | |
| A | Gaseous state | |
| B | Molten state or in solution | |
| C | Crystalline form | |
| D | High-temperature vacuum | |
| Not Answered | ||
| 01 | A battery is rated to supply 6 A for 16 hours. If the same battery is used to power a device that draws 8 A, for how long would it typically supply power? |
| A | 14 hours |
| B | 12 hours |
| C | 18 hours |
| D | 16 hours |
| 02 | Which type of torque in an analog instrument opposes the deflecting torque and returns the pointer to zero when the current is removed? |
| A | Action of gravity |
| B | Mass of the pointer |
| C | Electromagnetic torque |
| D | Controlling torque |
| 03 | In which type of machine is short pitch winding generally not used? |
| A | Synchronous generators |
| B | DC motors |
| C | 3-phase induction motors |
| D | Permanent magnet AC motors |
| 04 | A coil of resistance 10 is connected to a galvanometer. The magnetic flux through the coil changes from 5 mWb to 0 mWb in 0.1 s. What is the induced current? |
| A | 12 mA |
| B | 5 mA |
| C | 25 mA |
| D | 10 mA |
| 05 | An alternating voltage is given by the equation v = 10 sin (314t). What is the time taken to generate two complete cycles of the voltage? | |
| A | 0.04 s | |
| B | 0.25 s | |
| C | 0.5 s | |
| D | 1 ms | |
| Not Answered | ||
| 06 | A hot-wire voltmeter is connected across the terminals of an AC generator whose voltage waveform is given by: V = 200 sin( t) + 100 sin (3t) + 50 sin (5t)What will be the reading on the voltmeter? | |
| A | 210 V | |
| B | 178 V | |
| C | 162 V | |
| D | 315 V | |
| Not Answered | ||
| 07 | Which of the following transformer types is included within the scope of IS 2026-1 (2011) (Part 1)? |
| A | Three-phase transformers rated above 5 kVA |
| B | Single-phase transformers rated below 1 kVA |
| C | Welding transformers |
| D | Instrument transformers |
| 08 | The Curie-Weiss Law is a key principle in magnetism that describes the magnetic susceptibility of which type of materials? | |
| A | Superconducting materials | |
| B | Only ferromagnetic materials | |
| C | Paramagnetic and ferromagnetic materials | |
| D | Only diamagnetic materials | |
| Not Answered | ||
| 09 | In a three-phase rotating electrical machine, what does phase displacement in terms of slots typically refer to? |
| A | 120o / slot distance |
| B | 90o / slot distance |
| C | 180o / slot distance |
| D | 360o / slot distance |
| 10 | A 12 V battery is charged at 3 A for 12 hours and then discharged at 4.5 A for 5 hours. What is the Ampere-hour (Ah) efficiency of the battery? |
| A | 45 % |
| B | 82 % |
| C | 54 % |
| D | 62.5 % |
| 11 | In a single-phase series RL circuit powered by an AC voltage source, the resistance and reactance values are both 4 . In this circuit, the: | |
| A | Current leads the voltage by 90o | |
| B | Current lags the voltage by 90o | |
| C | Current leads the voltage by 45o | |
| D | Current lags the voltage by 45o | |
| Not Answered | ||
| 12 | In a three-stage charger for lead-acid batteries, what accurately describes the transition from the absorption stage to the float stage? | |
| A | The float stage begins when the battery temperature stabilizes, causing the charger to disconnect automatically | |
| B | The charging current reduces to a low level as determined by the battery's absorption capacity, triggering a switch to a lower float voltage | |
| C | The battery voltage drops below a preset threshold, and the charger raises the current to compensate | |
| D | The charger maintains maximum voltage while continuously increasing the current to top off the battery before entering float | |
| Not Answered | ||
| 13 | What is the method of extinguishing a fire by removing its fuel source called? |
| A | Starving |
| B | Blanketing |
| C | Smothering |
| D | Cooling |
| 14 | What type of current does an alternator produce? |
| A | Pulsating current |
| B | Constant current |
| C | Alternating current |
| D | Direct current |
| 15 | What is the minimum thickness required for a copper plate electrode used in earthing as per standard practice? |
| A | 3.15 mm |
| B | 2.5 mm |
| C | 2.65 mm |
| D | 1.75 mm |
| 16 | What is the process called that is used to make the electric stress distribution more uniform within the insulation of a power cable? |
| A | Termination of cables |
| B | Grading of cables |
| C | Shielding of cables |
| D | Grounding of cables |
| 17 | When a sinusoidal AC voltage is applied to an inductor, how does the voltage relate to the current? |
| A | Voltage and current are in phase |
| B | Voltage leads current by 180o |
| C | Voltage leads current by 90o |
| D | Voltage lags current by 90o |
| 18 | Among the following, H-type cables are most suitable for use up to which voltage level? |
| A | 66 kV |
| B | 240 kV |
| C | 132 kV |
| D | Beyond 264 kV |
| 19 | What is a key characteristic of a Thyrite lightning arrester used in high voltage protection? |
| A | It has fixed resistance regardless of voltage |
| B | It uses a Thyrite disc with resistance that decreases as voltage increases |
| C | It uses air as the arc quenching medium |
| D | It contains moving contacts for arc interruption |
| 20 | According to the inverse square law, the illumination on a surface is inversely proportional to the square of the __________. |
| A | Distance between the source and the surface |
| B | Luminous flux |
| C | Angle of incidence |
| D | Wattage of the lamp |
| 21 | Two 3-phase induction motors are connected in a cumulative cascade connection. The main motor has 4 poles, and the auxiliary motor has 8 poles. If the supply frequency is 50 Hz, what is the synchronous speed of the combined set? |
| A | 750 rpm |
| B | 1000 rpm |
| C | 650 rpm |
| D | 500 rpm |
| 22 | Which of the following is a diamagnetic material? |
| A | Copper |
| B | Cobalt |
| C | Chromium |
| D | Manganese |
| 23 | Among the following options, which typically represents the specific gravity of the electrolyte in a fully charged lead-acid battery? |
| A | 1.90 |
| B | 1.28 |
| C | 2.65 |
| D | 1.85 |
| 24 | Which of the following is the correct unit of magnetic permeance? |
| A | Weber/tesla |
| B | Ampere turns/weber |
| C | Weber/ampere turns |
| D | Ampere turns |
| 25 | When a sinusoidal voltage is applied to a purely inductive coil, what does the impedance of the coil equal? |
| A | The coil's capacitance |
| B | Its inductive reactance |
| C | The coil's resistance |
| D | Zero |
| 26 | A household energy meter has a meter constant of 400 revolutions per kWh. During a test in a new apartment, the meter disc completes 5 revolutions in 30 seconds. What is the connected electrical load in kilowatts (kW)? |
| A | 1 kW |
| B | 2 kW |
| C | 1.5 kW |
| D | 3 kW |
| 27 | Which of the following statements is true about a float charger used in battery backup systems? |
| A | It continually charges the battery at a pre-set voltage regardless of the battery's state of charge |
| B | It delivers high voltage and current continuously for quick charging |
| C | It stops charging once the battery reaches full charge |
| D | It charges the battery only when the load is disconnected |
| 28 | A diode has its terminal characteristics given by where Is is the reverse saturation current. If the thermal voltage VT = 30 Mv and the diode current Id = 2 mA, what is the dynamic resistance of the diode? |
| A | 12.5 |
| B | 100 |
| C | 50 |
| D | 15 |
| 29 | Which among the following is most suitable for high voltage circuit breaking applications? |
| A | Residual Current Circuit Breaker (RCCB) |
| B | Air Circuit Breaker (ACB) |
| C | Oil Circuit Breaker (OCB) |
| D | Molded Case Circuit Breaker (MCCB) |
| 30 | Which type of geothermal power plant uses geothermal hot water to heat a secondary fluid that turns to steam and drives a turbine? |
| A | Dry steam power plant |
| B | Binary-cycle power plant |
| C | Hydrothermal steam plant |
| D | Flash steam power plant |
| 31 | Which type of power system is specially designed for efficient long-distance transmission with reduced line losses? |
| A | High-voltage DC system |
| B | Three-phase, 4-wire system |
| C | Single-phase, 2-wire system |
| D | Three-phase, 3-wire system |
| 32 | In a crossflow turbine, how does the water interact with the turbine blades? |
| A | It passes diagonally or across the turbine blades |
| B | It strikes the blades tangentially in one direction only |
| C | It flows in a spiral path along the blade surfaces |
| D | It flows vertically downward without changing direction |
| 33 | What is the major issue when using a dynamometer-type wattmeter at low power factor? |
| A | Accurate reading |
| B | Low measurement error |
| C | High measurement error |
| D | High deflecting torque |
| 34 | A 1000 kVA transformer is originally designed to operate at 200 Hz. For a specific industrial application, it needs to be operated at 50 Hz. Assuming the voltage is adjusted proportionally to maintain the same magnetic flux density, what will be its new kVA rating? |
| A | 250 kVA |
| B | 1000 kVA |
| C | 500 kVA |
| D | 100 kVA |
| 35 | What is referred to as the golden hour in the case of a victim with a serious head injury and risk of death? |
| A | The first 1 hour after injury |
| B | The first 10 minutes after injury |
| C | The first 3 hours after injury |
| D | The first 2 hours after injury |
| 36 | Which of the following statements best describes an advantage of the ring main electrical power distribution system over the radial system? |
| A | It ensures continuous supply to consumers even if one feeder fails |
| B | It requires fewer conductors and is cheaper to install |
| C | It completely eliminates the need for transformers |
| D | It allows direct connection of all consumers to the substation |
| 37 | Which type of power plant is typically chosen for continuous operation due to its low running cost despite requiring a high initial investment? |
| A | Captive power plant |
| B | Peak load plant |
| C | Standby plant |
| D | Base load plant |
| 38 | Which of the following instruments is most commonly used for testing the installation of electrical wiring? |
| A | Megger |
| B | Ammeter |
| C | Voltmeter |
| D | Ohmmeter |
| 39 | Which of the following is the dominant gas present in biogas? |
| A | Hydrogen |
| B | Methane |
| C | Oxygen |
| D | Helium |
| 40 | Which of the following best describes the chemical reaction occurring in a lead-acid battery during discharge? |
| A | Lead sulfate breaks down into lead and sulfuric acid |
| B | Hydrogen gas is evolved at both electrodes during discharge |
| C | Sulfuric acid concentration increases as the battery discharges |
| D | Lead dioxide at the anode and lead at the cathode both convert to lead sulfate |
| 41 | Which of the following laws helps in determining the most cost-effective size for an electric power transmission line conductor? |
| A | Ampere's circuital law |
| B | Kelvin's law |
| C | Faraday's law |
| D | Joule's law |
| 42 | A 6-pole DC generator has 400 armature conductors and a useful flux of 0.06 Wb per pole. When it is lap wound and runs at 1000 rpm, it generates a certain voltage. If the same generator is wave wound instead, at what speed must it run to generate the same voltage? |
| A | 333.3 rpm |
| B | 1000 rpm |
| C | 666.6 rpm |
| D | 1210 rpm |
| 43 | Electrolysis of dilute aqueous NaCl solution is carried out by passing a current of 40 mA. What will be the approximate time required to liberate 1.2 grams of H2 gas at the cathode? (Given: Equivalent weight of H2 = 1 g, Faraday's constant F = 96500 C/mol) | |
| A | 1,725,000 seconds | |
| B | 2,895,000 seconds | |
| C | 3,665,000 seconds | |
| D | 2,155,000 seconds | |
| Not Answered | ||
| 44 | Two bulbs, one rated at 200 W and the other at 100 W, both for 100 V, are connected in series across a 200 V DC supply. What is the total power consumed by the circuit? |
| A | 266.67 W |
| B | 133.33 W |
| C | 200 W |
| D | 300 W |
| 45 | Which type of power plant is physically and operationally incapable of achieving a 100% load factor due to its fundamental design purpose? |
| A | Geothermal power plant |
| B | Base load plants |
| C | Nuclear power plant |
| D | Peak load plant |
| 46 | Three impedances of 30 each are connected in a star configuration. What will be the equivalent impedance of each branch in the delta configuration? |
| A | 30 |
| B | 90 |
| C | 60 |
| D | 10 |
| 47 | Calculate the approximate current drawn by a 5 HP, 3-phase motor for selecting wire size, if the motor efficiency is 85%, power factor is 0.8, and the supply voltage is 400 V. | |
| A | 2.65 A | |
| B | 6.45 A | |
| C | 7.92 A | |
| D | 9.26 A | |
| Not Answered | ||
| 48 | Which of the following statements correctly distinguishes arc interruption methods used in AC and DC circuit breakers? |
| A | The low resistance method is effective only in AC circuits due to the presence of natural current zero |
| B | The high resistance method is suitable only for high voltage AC systems due to rapid dielectric recovery |
| C | Arc interruption using the low resistance method is applied in DC circuits where current has no natural zero |
| D | Arc interruption using the high resistance method is preferred in only AC circuits due to the natural current zero |
| 49 | A 230 V single-phase circuit supplies a current of 15 A through a copper cable with a cross-sectional area of 1.5 mm2. If the load is situated 20 meters from the distribution board and the copper conductor has a resistance of 9.5 ohms per kilometer, what is the resulting voltage drop across the cable? | |
| A | 5.7 V | |
| B | 2.85 V | |
| C | 6.75 V | |
| D | 7.25 V | |
| Not Answered | ||
| 50 | The National Electrical Code (NEC) 2011 in India is published by which organization? |
| A | Bureau of Indian Standards |
| B | Central Electricity Authority |
| C | Power Grid Corporation of India |
| D | Ministry of Power |
| 51 | In electroplating, the material to be coated is connected to which terminal of the power supply? |
| A | Positive terminal |
| B | Ground terminal |
| C | Negative terminal |
| D | Both terminals alternately |
| 52 | To increase the energy stored in the coil by 3 times, the current should be increased by: |
| A | 35 percent |
| B | 73.2 percent |
| C | 100 percent |
| D | 41.4 percent |
| 53 | What is the unit of magnetomotive force (MMF) in the CGS (centimetre-gram-second) system of units? |
| A | Gauss |
| B | Oersted |
| C | Maxwell |
| D | Gilbert |
| 54 | A 4-pole DC dynamo runs at 1000 rpm. It has 75 slots with 8 conductors per slot, and the armature is lap wound. If the flux per pole is 0.064 Weber, what is the EMF induced? |
| A | 200 V |
| B | 624 V |
| C | 640 V |
| D | 720 V |
| 55 | Which of the following waste management techniques results in the generation of considerable heat during the process? |
| A | Composting |
| B | Recycling |
| C | Incineration |
| D | Waste compaction |
| 56 | What is the SI unit of the electrochemical equivalent (Z) of a substance? |
| A | Coulomb/Kg |
| B | Kg-Coulomb |
| C | Kg/Coulomb |
| D | Coulomb/Litre |
| 57 | What is a photovoltaic (PV) array in a solar power system? |
| A | A single solar cell generating minimal power |
| B | Multiple solar panels wired together to form a larger electricity-generating unit |
| C | A battery unit storing energy from solar panels |
| D | A group of solar inverters converting DC to AC |
| 58 | Compared to MCBs, what type of current rating can MCCBs typically handle? |
| A | Higher currents |
| B | Limited short-circuit current |
| C | Only DC |
| D | Lower currents |
| 59 | According to BIS, what is the minimum standard value of insulation resistance in Mega Ohms for a 10-point electrical circuit? |
| A | 1.0 M |
| B | 0.5 M |
| C | 2.5 M |
| D | 5.0 M |
| 60 | What is the primary purpose of an Earth Leakage Circuit Breaker (ELCB)? |
| A | To protect humans and animals from electric shock |
| B | To protect devices from lightning strikes |
| C | To increase voltage in electrical circuits |
| D | To prevent damage due to overcurrent |
Section - II (Numerical, G.K & Reasoning)
| 61 | Whom did Prithvi Raj Chauhan defeat in the First Battle of Terrain in 1191 A.D? |
| A | Humayun |
| B | Nadir Shah |
| C | Rana Sanga |
| D | Mohammed Ghori |
| 62 | Which organization of India has received the Aviation Week Laureates Award? |
| A | ISRO |
| B | CSIR |
| C | ICAR |
| D | DRDO |
| 63 | Find the simple interest, when principal amount is Rs. 3600, rate of interest is 6% per annum and the time is 4 years. |
| A | Rs. 901 |
| B | Rs. 799 |
| C | Rs. 864 |
| D | Rs. 787 |
| 64 | The average of 20 numbers is 180 and the average of first 5 numbers is 90.The average of the rest is: |
| A | 250 |
| B | 310 |
| C | 210 |
| D | 300 |
| 65 | The sum of the ages of Mary and Jane is 64. If the ratio of Mary's age to Jane's age is 3 : 5 respectively, what is Jane's age? |
| A | 49 |
| B | 46 |
| C | 40 |
| D | 36 |
| 66 | In a row of boys, A is 16th from the left end and B is 20th from the right end, if they interchange their positions, then A becomes 24th from left end. How many boys are there in the row? |
| A | 42 |
| B | 40 |
| C | 43 |
| D | 45 |
| 67 | When did the Constitution of India come into effect? |
| A | March 15, 1950 |
| B | August 15, 1947 |
| C | January 26, 1950 |
| D | January 1, 1950 |
| 68 | Which of the following words has its letters in an English alphabetical order? Bus, Beast, Base, Bow. |
| A | Bow |
| B | Base |
| C | Beast |
| D | Bus |
| 69 | Study the following arrangement and answer the question: A B 7 C D 9 Z Y * P 2 M C K S 3 ^ S N T @ Which of the following number is immediately followed by symbol and immediately preceded by letter in an above arrangement? |
| A | 9 |
| B | 3 |
| C | 2 |
| D | 7 |
| 70 | M, N, O, P, Q and S are sitting in a row. Q and S are in the centre, and M and N are at the ends. O is to the immediate left of M. Then who is sitting to the immediate right of N? |
| A | O |
| B | Q |
| C | M |
| D | P |
| 71 | In a class, the ratio of girls to boys is 3:2 respectively. If there are 18 boys, how many girls are there in the class? |
| A | 27 |
| B | 25 |
| C | 23 |
| D | 19 |
| 72 | Who is the author of the book "The Collector's Wife"? |
| A | Mitra Phukan |
| B | Khushwant Singh |
| C | Vijaya Lakshmi |
| D | Jahangir |
| 73 | Convert 3/5 into percentage. |
| A | 95% |
| B | 60% |
| C | 30% |
| D | 90% |
| 74 | A dealer bought 50 kg of rice at Rs. 10 per kg and sold it at Rs. 15 per kg. What is the total profit earned by the dealer? |
| A | Rs. 300 |
| B | Rs. 250 |
| C | Rs. 350 |
| D | Rs. 200 |
| 75 | If there are 65 red marbles and 15 blue marbles in a bag, what is the ratio of red marbles to blue marbles? |
| A | 13:3 |
| B | 11:10 |
| C | 12:7 |
| D | 10:3 |
| 76 | Which institution opened its first international campus in Abu Dhabi, UAE? |
| A | IIT Delhi |
| B | IIT Bombay |
| C | IIT Kanpur |
| D | IIT Roorkee |
| 77 | In a class of 40 students, 18 students like Mathematics, 16 students like Science and 10 students like both Mathematics and Science.Then, find the number of students who like either Mathematics or Science? |
| A | 20 |
| B | 21 |
| C | 24 |
| D | 22 |
| 78 | Which language in India is called the "Italian of the East"? |
| A | English |
| B | Bengali |
| C | Telugu |
| D | Hindi |
| 79 | In a certain language, if 'CODE' is coded as '7654' and 'ROOT' is coded as '2663', then how is 'DORE' coded in that language? |
| A | 5624 |
| B | 5672 |
| C | 5246 |
| D | 7652 |
| 80 | A man walks 4 km towards North. Then he turns to left and walks 8 km and again, he turns to left and walks 4 km. and then he turns to right and walks 2 km. How far is he from the starting point? |
| A | 14 km |
| B | 12 km |
| C | 10 km |
| D | 16 km |
Section - III (English Language)
| 81 | What does the term "obscure" mean? |
| A | Elaborate |
| B | Clarify |
| C | Simplify |
| D | Unclear |
| 82 | Fill in the blank with the correctly spelled word. The recipe calls for one ___________ of sugar. |
| A | teaspon |
| B | teaspoon |
| C | teasspoon |
| D | teaspoone |
| 83 | Change the sentence to passive voice. The farmer planted sunflowers in his field. |
| A | Planting sunflowers in his field was done by the farmer. |
| B | Sunflowers were planted by the farmer in his field. |
| C | Sunflowers were planted in the field by the farmer. |
| D | The farmer was planting sunflowers in his field. |
| 84 | Choose the most appropriate preposition for the blank space. We will be meeting with the team ____ Friday. |
| A | of |
| B | in |
| C | to |
| D | on |
| 85 | Choose the correct part of speech for the underlined word in the given sentence. Rita is traveling to Delhi on Friday by the train. |
| A | Adjective |
| B | Noun |
| C | Adverb |
| D | Pronoun |
| 86 | Select the option which best expresses the following sentence in direct speech. The policeman enquired the beggar where he lived. |
| A | The policeman asked the beggar, "Where does he lived?" |
| B | The policeman enquired the beggar, "Where do you live?" |
| C | The policeman said the beggar, "Where do you live?" |
| D | The policeman wanted to ask the beggar, "Where do you live?" |
| 87 | What does the idiom "let the cat out of the bag" mean? |
| A | Hide something |
| B | Share a secret or disclose something unintentionally |
| C | Keep a secret |
| D | Release a cat from a bag |
| 88 | Complete the sentence using the correct preposition. When I'm late my dad takes me to office ____ his bike. |
| A | of |
| B | to |
| C | for |
| D | by |
| 89 | Identify the verb in the sentence. Lalitha eats her dinner very quickly. |
| A | Lalitha |
| B | Dinner |
| C | Very |
| D | Eats |
| 90 | Choose the one-word substitute for the following. "A group of Lions". |
| A | Murder |
| B | Pride |
| C | Clutter |
| D | Barrel |
| 91 | Select the option which best expresses the following sentence in Indirect speech. She said, "I am seeing my brother tomorrow." |
| A | She said that she went to see her brother the next day |
| B | She said that she wanted to see her brother the next day |
| C | She said that she was saw her brother the next day. |
| D | She said that she was seeing her brother the next day. |
| 92 | Which option correctly uses the past perfect tense? |
| A | I will be eating at this restaurant twice before tonight. |
| B | I ate at this restaurant twice before tonight. |
| C | I had eaten at this restaurant twice before tonight. |
| D | I have eaten at this restaurant twice before tonight. |
| 93 | Identify the sentence in past continuous tense. |
| A | The students had been practicing for the competition. |
| B | The students were practicing for the competition. |
| C | The students had practiced for the competition. |
| D | The students have been practicing for the competition. |
| 94 | Identify the "Cause and Effect Connectors" from the options given. |
| A | Also |
| B | First |
| C | But |
| D | Consequently |
| 95 | Choose the option that will make the sentence grammatically correct and meaningfully complete. The Sunday dinner is usually __________ by the father for his family. |
| A | cooked |
| B | cooks |
| C | was cooked |
| D | cooking |
| 96 | Choose the correct part of speech for the underlined word in the given sentence. The astronomer observed distant galaxies through a powerful telescope. |
| A | Adjective |
| B | Noun |
| C | Verb |
| D | Adverb |
| 97 | Fill in the blank with correct article. Delhi is ____ capital city of India. |
| A | a |
| B | an |
| C | the |
| D | No Article Required |
| 98 | Convert the following sentence to Active Voice. This school was built by my grandfather. |
| A | My grandfather is building this school. |
| B | This is the school my grandfather built. |
| C | My grandfather built this school. |
| D | My grandfather builds the school. |
| 99 | Choose the option which when inserted in the blank, best fits the meaning of the sentence as a whole. Someone _______ at the door early in the morning today. |
| A | have been knocking |
| B | is knocking |
| C | has been knocks |
| D | was knocking |
| 200 | Complete the sentence using the correct preposition. The mango tree _____ our neighbour drops fruit in our yard. |
| A | on |
| B | at |
| C | of |
| D | for |