1. Protection against overload current
2. Protection against high input voltage
3. Protection against frequency variations
4. Protection against temperature variations
ANS- 2
2.Which of the following best defines the effect of corona on a power line?
1. The diameter of the conductor remains the same, whereas the electrostatic stress is decreased.
2. The virtual diameter of the conductor is decreased and the electrostatic stress is increased.
3. The diameter of the conductor is increased but the electrostatic stress remains the same.
4. The virtual diameter of the conductor is increased and the electrostatic stress is decreased.
ANS-4
3.Which of the following statements are correct for planned preventive maintenance?
(i)Overtime costs are reduced
(ii)Improves the safety and health of workers
(iii)Reduced number of repairs
(iv)Improper usage of manpower
1. Only ii, iii and iv
2. Only i, ii and iv
3. Only i, ii and iii
4. Only i and iii
ANS- 3
4. An 8-pole DC generator has 960 armature conductors and a flux per pole of 20 mWb running at 1500 rpm.
Calculate the EMF generated when the armature is connected as a simplex lap-winding:
1. 480 V
2. 1920 V
3. 4800 V
4. 192 V
ANS- 1
5. Which of the following statements is true?
1. Plain break oil circuit breakers are used in high voltage applications above 11 KV.
2. The effect of carbonization is low in a low oil circuit breaker.
3. The space requirement of a low-oil circuit breaker is less compared to a plain circuit breaker.
4. The arc length to quench the arc is lower in a plain-break oil circuit breaker.
ANS- 3
6. Which of the following statements is correct with respect to conductors?
1. For the same current rating, the cross-section of an aluminium wire should be more than that of a copper wire.
2. A silver has less conductivity than copper and hence not commonly used as conductors.
3. A single conductor has more mechanical strength than stranded conductors.
4. As the number of a standard wire gauge increases, the diameter also increases.
ANS- 1
7. Which of the following statements is correct regarding the testing of electronic components?
1. A UPS should be tested in no load condition.
2. While testing a DIAC using an ohmmeter, it should show a high resistance from one direction and low resistance from the opposite direction.
3. A low resistance across the base-emitter or base-collector region indicates a reverse biased condition in a transistor.
4. A battery is said to be fully discharged if the voltage while testing with a high discharge tester is below 1V.
ANS- 1
8. Which of the following statements is true with respect to the various characteristics of single phase motors?
Ans 1. In a capacitor start capacitor run motor, the capacitor with continuous duty is preferred for starting and that with short duty is preferred for running.
2. In a permanent capacitor motor, the capacitors should be of oil-type and should have continuous duty cycle.
3. The efficiency of a shaded pole motor is normally high.
4. The thickness of the shaded coil is high in a shaded pole motor and the inductance is low.
ANS- 2
9. An ideal battery having capacity of 5000 mAh, can supply 400 mA current for:
1. 20 hours
2. 12 hours 50 minutes
3. 24 hours
4. 12 hours 30 minutes
ANS-4
10.Respiratory protective equipment comes under which category of Personal Protective Equipment?
1. PPE5
2. PPE2
3. PPE4
4. PPE3
ANS- 4
11.Which of the following statements is FALSE regarding a nuclear power plant?
1. Sodium metal is used as a coolant in a nuclear power plant.
2. The power of a nuclear reactor is increased while pulling out the control rods.
3. Graphite is a strong neutron absorber and thus regulates the supply of neutrons for fission.
4. Enriched uranium is used in a boiling water reactor.
ANS-3
12.Which of the following statements is INCORRECT for the checks on electrical connections?
1. The voltage at the point of commencement of supply at consumer end shall not be more than 12 per cent in case of low or medium voltage.
2. The voltage drop in the cable shall not be more than 10 per cent of the standard supply voltage.
3. Considering the diversity factor of installations, no diversity is allowed for thermostatically controlledwater heaters.
4. The voltage at the point of commencement of supply at consumer end shall not be more than 5 percent in case of high or extra high voltages
ANS-3
13.Which of the following statements is true regarding the various aspects of construction of a transformer?
1. The presence of silicon in the laminations helps in reducing the hysteresis loss of the transformer core.
2. Stepped-core arrangement is used in small sized transformers.
3. Cold rolling is done to reduce the permeability of the machine.
4. Oil cooling is preferred for small transformers and air cooling for large transformers.
ANS-1
14.Which of the following statements is INCORRECT regarding the connection of flasher in a circuit?
1. If the lamps are of different ratings, then the flasher should be of the highest current capacity in that circuit.
2. The flasher is normally connected at the supply considering it as a switch.
3. It does not give light, but acts as a switch for other lamps.
4. If the bimetallic strip is found welded to a fixed strip, then the flasher is found to be non-usable.
ANS-1
15.Which of the following statements is true?
1. The resistance of the conductor is reduced as a result of the skin effect.
2. The effective area of cross-section of the conductor through which the current flows is reduced as a result of the skin effect.
3. The result of the skin effect is the production of an ozone gas around the overhead transmission line.
4. As a result of Corona, the alternating current tends to concentrate near the surface of the conductor.
ANS-2
16.The measurement GI plate used in plate earthing is:
1. 60 cm × 60 cm × 6 cm
2. 50 cm × 50 cm × 5 mm
3. 50 cm × 50 cm × 5 cm
4. 60 cm × 60 cm × 6 mm
ANS-4
17.Which of the following hand tools is NOT used for drilling holes?
1. Rawl plug tool and bit
2. Hand drill
3. Ratchet brace
4. Plumb bob
ANS-4
18.Which of the following components of a hydel power plant is used to overcome the abnormal pressure on the conduit during the rise of load in a turbine?
1. Penstock
2. Draft tube
3. Spillways
4. Surge tank
ANS-4
19.Which of the following statements is correct?
1. In order to generate the same amount of energy as that in a tidal plant, the diameter required for it is the same as that of a windmill.
2. In order to generate the same amount of energy as that in a tidal plant, the diameter required for it is about one-fourth of that of a windmill.
3. In order to generate the same amount of energy as that in a tidal plant, the diameter required for it is about double of that of a windmill.
4. In order to generate the same amount of energy as that in a tidal plant, the diameter required for it is about one-half of that of a windmill.
ANS-2
20.Which of the following statements is correct regarding DC motors?
1. A DC shunt motor should be always started on load.
2. The mechanical characteristics of a DC shunt motor is a straight line through the origin.
3. Cumulative compound motor produces a high starting torque than that of a shunt motor.
4. A DC series motor is called as a constant speed motor.
ANS-3
21.Which of the following statements is NOT true about a dynamometer type instrument?
1. It has a high torque/weight ratio — as such has high sensitivity
2. When used as wattmeter, the scale is uniform.
3. This instrument can be used both in AC and DC.
4. This instrument has no hysteresis and eddy current losses.
ANS-1
22. If Z is the number of conductors and P is the number of poles, what is the average pole pitch A for a retrogressive duplex wave winding?
1. YA =(Z+2)/P
2. YA =(Z+4)/P
3. YA =(Z-2)/P
4. YA =(Z-4)/P
ANS-4
23.Which of the following statements is correct about the types of cells?
1. Lead acid cell is a most common wet cell
2. Alkaline cells are less expensive than carbon-zinc cells
3. Primary cells are rechargeable cells
4. A wet cell can be operated in any position without having electrolytic leakage
ANS-1
24. If the operating voltages are greater than 66 KV, which type of UG cables are preferred?
1. Oil filled cables
2. Belted cables
3. SL type cables
4. H-type cables
ANS-1
25.The magnetising intensity required to bring down the magnetism in a core to zero is called:
1. reluctivity
2. retentiveness
3. permeability
4. coercivity
ANS-4
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26.The process of controlled combustion of garbage to reduce it to incombustible matter, ash, waste gas and heat, is called:
1. composting
2. recycling
3. incineration
4. waste compaction
ANS-3
27. Which of the following voltage and length considerations is true regarding power lines?
1. The length of an overhead transmission line is about 50 km and the line voltage is less than 20 KV for a short transmission line
2. The length of an overhead transmission line is more than 100 km and the line voltage is between 50 KV and 100 KV for a medium transmission line
3. The length of an overhead transmission line is about 50 km and the line voltage is less than 50 KV for a short transmission line.
4. The length of an overhead transmission line is more than 100 km and the line voltage is more than 100 KV for long transmission lines
ANS-1
28. Which of the following statements is correct regarding the types of stabilizers?
1. A toroidal autotransformer is used in stepped voltage stabilizer.
2. The primary and secondary windings are closely coupled in a constant voltage transformer stabilizer.
3. A stepped voltage stabilizer is used in Xerox machines.
4. A servo stabilizer is more accurate than a stepped voltage stabilizer.
ANS-4
29. Power in a three-phase, three-wire system having unbalanced load can be measured by using the:
1. four wattmeter method
2. single wattmeter method
3. two wattmeter method
4. three wattmeter method
ANS-3
30. Which of the following is a condition for a self-excited DC generator to build up voltage?
1. The polarity of the induced voltage must be in such a direction as to produce the field current to oppose the residual magnetism.
2. The field resistance should be above the field critical resistance value.
3. The field resistance should be below the field critical resistance value.
4. The generator should run below the critical speed.
ANS-3
31. Isolating fire by cutting off oxygen supply from the surrounding of the fire is called:
1. starvation
2. cooling
3. blowing
4. smothering
ANS-4
32.A cold chisel is made out of:
1. silicon steel
2. mild steel
3. pig iron
4. high carbon steel
ANS-4
33. A resistor is connected across a 230 V source. If the colour code of the given resistance is red, black, orange and gold, in order, then the current in the resistance is:
1. 2.3 mA
2. 11.5 mA
3. 1.15 mA
4. 23 mA
ANS- 2
34. Which of the following is the most suitable flux for joining electrical conductors?
1. Hydrochloric acid 10 per cent diluted with water 90 per cent
2. Rosin
3. Zinc chloride
4. Sal ammonia rosin
ANS-2
35. Which of the following electrolytes is used in a Leclanche cell?
1. Ammonium chloride
2. Sulphuric acid
3. Hydrochloric acid
4. Potassium hydroxide
ANS-1
36. Which of the following charging methods is the most suitable for SMF batteries?
1. Constant power factor
2. Constant current
3. Constant voltage
4. Constant voltages-constant current
ANS-4
Q.37 Which of the following statements is correct regarding the voltage build-up in a DC generator?
1. The field resistance should be above the critical field resistance.
2. The polarity of induced voltage must be such as to generate a field current that would assist the residual magnetism.
3. The polarity of the field poles depends on the direction of rotation of the machine.
4. The generator should be run above the rated speed.
ANS-2
Q.38 Which of the following statements is true for salient pole alternators?
1. The speed of operation of these alternators lies in low to medium range.
2. They are driven by steam turbines.
3. The axial length is larger in length.
4. The diameter of these alternators is small.
ANS-1
Q.39 Which of the following electrical wire joints is used in overhead lines for taping the electrical energy perpendicular to the service lines?
1. Scarfed joint
2. Britannia joint
3. Western Union joint
4. Britannia Tee joint
ANS-4
Q.40 Which of the following options is correct with regard to the application of various electrical wire joints?
1. A Western Union joint is used in overhead lines to extend the length of wire at times of high tensile stress.
2. A Britannia joint falls under the category of a tap joint.
3. A tee joint is used in a junction box.
4. An aerial tap joint is suitable for circuits having high current.
ANS-1
Q.41 Which of the following statements is correct regarding current relay?
1. The rated secondary current of the CT is called the pick-up current.
2. It uses two permanent magnets in the system.
3. The time setting multiplier is calibrated from 0 to 1 in steps of 0.1.
4. The relay exhibits inverse-time characteristics.
ANS-4
Q.42 Which of the following statements is true regarding the power measurement using the two wattmeter method?
1. Measuring power by a single wattmeter method is suitable for star connected loads and by the two
wattmeter method is suitable for delta connected loads only.
2. For a power factor less than 0.866, one of the wattmeter readings is negative.
3. At a power factor of zero, both the wattmeters do not indicate any reading.
4. At a power factor of 0.5, the reading of one wattmeter is zero, while the other reads the total power.
ANS-4
Q.43 Which of the following is the 2nd highest conductive material?
1. Gold
2. Copper
3. Aluminium
4. Silver
ANS-2
Q.44 Which of the following AC voltage stabilizers is the most accurate?
1. Stepped voltage stabilizer
2. Servo voltage stabilizer
3. Constant current transformer
4. Constant voltage transformer
ANS-2
Q.45 Which of the following is the most sustainable waste disposal method?
1. Recycling
2. Animal feed
3. Landfill
4. Fire wood
ANS-1
Q.46 Which of the following methods are suggested to bring down the earth electrode resistance to an acceptable value?
(i)Pouring water in the earth pit at repeated intervals lowers the earth electrode resistance.
(ii)Soldering the earth connections or using non-ferrous clamps lowers the earth electrode resistance.
(iii)Remove the parallel connection of earth electrodes which are already connected.
(iv)Avoiding rust in the earth electrode connections lowers the earth electrode resistance.
1. Only ii, iii and iv
2. Only i, ii and iv
3. Only i and iii
4. Only i, ii and iii
ANS-2
Q.47 Which of the following statements is correct regarding the various insulators used in power systems?
1. If the working voltage is 66 KV, then 6 insulators would be provided in parallel with the string.
2. Pin insulators are used for medium voltage lines only.
3. Suspension type insulators are used for voltages more than 33 KV.
4. Shackle insulators are used for holding the line conductors on straight running of poles.
ANS-3
Q.48 Which of the following is a factor that decides the type of cable to be used in connections?
1. The current carrying capacity of the cable.
2. Permissible voltage drop in the cable.
3. The length of wiring used in the circuit.
4. The location of the circuit and type of wiring.
ANS-4
Q.49 Which of the following statements is INCORRECT?
1. A reactance relay is an example of a directional relay.
2. The impedance of a transmission line is inversely proportional to its length which is made use of in an admittance relay.
3. The differential protection can be used for protecting generators from faults to the ground.
4. The differential protection of busbars in a substation makes use of two CT connections per line.
ANS-1
Q.50 The most commonly used battery in a UPS system is:
1. silver oxide cell
2. alkaline cell
3. carbon-zinc cell
4. valve regulated lead acid battery
ANS-4
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Q.51 The repeated closure of the circuit to start a motor from rest, producing small movements in the driven machine
is called:
1. jogging
2. active sensor
3. industrial agitator
4. sequential control
ANS-1
Q.52 The hysteresis loss in a DC machine forms a part of:
1. the iron loss in the armature
2. the copper loss in the armature
3. the iron loss in the field winding
4. the copper loss in the field winding
ANS-1
Q.53 Which of the following is an application of differential compound DC generator?
1. Used for lighting loads and power loads of small buildings
2. Used as booster generator
3. Used for arc welding generators
4. Used for electroplating
ANS-3
Q.54 Which of the following statements is correct regarding circuit breakers?
1. A vacuum circuit breaker falls in the category of medium circuit breakers.
2. A circuit breaker is called an Over Voltage Protection Device [OVPD].
3. An air circuit breaker can be used for applications up to 33 KV only.
4. The voltage across the breaking contact at arc extinction is called the arc voltage.
ANS-1
Q.55 Which of the following statements about DC compound machines is correct?
1. The series field winding is made of wires of small cross-section and more number of turns.
2. The shunt field winding is made up of wires of small cross-section and few number of turns.
3. The series field winding is made of wires of large cross-section and more number of turns.
4. The shunt field winding is made up of wires of small cross-section and more number of turns.
ANS-4
Q.56 While selecting the luminaries, the distance of the light source from the wall should be:
1. one-half the distance between two adjacent light sources
2. equal to the distance between two adjacent light sources
3. double the distance between two adjacent light sources
4. independent of the distance between two adjacent light sources
ANS-1
Q.57 Which of the following statements is correct regarding the selection of luminaries?
1. Sodium discharge lamps are used for lighting over small premises.
2. Metal halide lamps are used in sports stadiums.
3. Mercury vapour lamps are used in reflectors.
4. Tubular fluorescent lamps are used for lighting purposes over large premises.
ANS-2
Q.58 Which of the following statements regarding magneto hydro dynamic power generation is true?
1. A low to medium temperature gas is needed as a source in MHD generation.
2. The efficiency of MHD power generators is typically around 50 per cent.
3. It uses the same turbines as in hydro power plants.
4. The metallic conductor is replaced by a conducting gas plasma in MHD generation.
ANS-4
Q.59 Which of the following lamps is suitable for semi-direct lighting system?
Ans 1. Sodium vapour lamp
2. Fluorescent lamp
3. Incandescent lamp
4. Mercury vapour lamp
ANS-2
Q.60 Which of the following statements is true regarding Kirchhoff’s Current Law?
Ans 1. It states that there is a possibility of charge accumulation at the node.
2. Charge accumulation may or may not be possible depending on the circuit.
3. The node may act as an energy storage point.
4. It states that there is no possibility of a charge accumulation at the node
ANS-4
Q.61 Which of the following statements is true regarding domestic appliances?
1. A permanent magnet is made use of while designing an electric bell.
2. The diameter of the heating element used in an electric heater must be higher for higher wattages.
3. The sole plate of an electric iron is made of chromium.
4. The insulation resistance between a heating element and the body must not be less than one kilo ohm for safe insulation installations.
ANS-2
Q.62 What is the spacing between brushes for a wave winding if a machine of 8-pole DC armature has 24 slots having 2 coil sides per slot and single turn coil?
1. 8 segments
2. 3 segments
3. 6 segments
4. 12 segments
ANS-4
Q.63 Which of the following statements about Buchholz relays is INCORRECT?
1. They are widely used in transformers.
2. These are gas operated relays.
3. They are mainly employed in gas immersed relays.
4. Mercury switch contacts are used in this type of a relay system.
ANS-3
Q.64 Which of the following statements is true regarding a steam power plant?
1. A fire tube boiler is more widely used than a water tube boiler in a steam power plant.
2. The complete expansion of the steam takes place in the fixed blades in an impulse steam turbine.
3. The air-preheater heats the feed water on its way to the boiler taking the heat from the flue gases.
4. The boiler furnace in a steam power plant is made of special alloys like chromium-molybdenum.
ANS-2
Q.65 Which of the following effects of armature reaction in an alternator is true?
1. The field excitation current must be decreased to compensate the de-magnetizing effect in alternators.
2. Cross magnetization effect occurs at zero power factor lagging and causes distortion of the magnetic
field.
3. Magnetizing effect occurs at zero lagging power factor and the field excitation current has to be
decreased to reduce this effect on alternators.
4. Magnetizing effect occurs at zero power factor leading which increases the induced EMF.
ANS-4
Q.66 Which of the following statements is true regarding a distribution system?
1. Voltage drop is a major consideration in the selection of a feeder.
2. The current in each section of a distributor is the same.
3. The current in each section of a feeder is the same.
4. Ring distribution system is employed for distribution at 11 KV.
ANS-3
Q.67 Gimlet is used for:
1. cutting copper and aluminium wires of smaller diameter (less than 4 mm dia)
2. extracting nails from wood
3. making holes in bricks, concrete wall and ceiling
4. boring small holes on wooden articles
ANS-4
Q.68 Which of the following is NOT a factor affecting earth resistance?
1. Moisture content in the soil
2. Magnetic permeability of the soil
3. Temperature of the soil
4. Depth at which electrode is placed
ANS-2
Q.69 Which of the following statements is correct about general lighting systems?
1. Indirect lighting schemes are preferred for outdoor lighting schemes.
2. Semi-indirect lighting is used mainly for indoor light decoration purposes.
3. Semidirect lighting schemes are used in workshops with large machines.
4. Direct lighting systems are more suitable for rooms with high ceilings.
ANS-2
Q.70 In small DC machines, the armature conductors are kept in the commutator raiser slits and spot welded; this is called:
1. brazing
2. banding the armature
3. hot stacking
4. cord bands
ANS-3
Q.71 Which of the following is an advantage of DC drives?
1. Suitable for high speed operation.
2. DC drives are normally less expensive for most horsepower ratings.
3. Low maintenance is required.
4. Lighter than AC motors.
ANS-2
Q.72 Which of the following safety rules is correct for electric works?
1. Do connect earthing to the water pipe lines
2. Extend electrical circuits by using temporary wiring
3. Connections in the electrical apparatus should not be tight
4. Stand on rubber mats while working/operating switch panels, control gears etc
ANS-4
Q.73 Which of the following statements is INCORRECT regarding an air circuit breaker?
1. An air blast circuit breaker is used where frequent operation is necessary.
2. A plain air circuit breaker is preferred in low voltage applications.
3. It is used in electricity sharing systems of up to 30 KV.
4. It is used for the protection of transformers, capacitors and generators.
ANS-3
Q.74 Which of the following statements is true about various wiring methods?
1. The distribution board system of wiring enables the appliances connected to the system to have the same currents.
2. Cleat wiring is preferred for permanent installations.
3. The tree system of wiring is suitable for multi-storeyed buildings
4. As per the IEE regulations, one ring circuit should be there for every 200 sq. m or part thereof while.doing ring main wiring
ANS-3
Q.75 Which of the following statements is true about various generator types?
1. The load current in shunt generators must be above the maximum current to avoid dips in terminal voltage.
2. The voltage of cumulatively compounded generators is variable on operation.
3. Separately excited generators are used when the output voltage requirement is of narrow range.
4. Series generators are used as series boosters to neutralise the effect of line ohmic drop.
ANS-4
Q.76 With reference to the various classifications of squirrel cage induction motors, select the INCORRECT statement.
1. Class C motors have higher starting torque compared to class B motors.
2. Class D motors are high slip motors.
3. Class E motors have low starting torque and low current slip.
4. Class A motors have high rotor circuit resistance and reactance.
ANS-4
Q.77 Which of the following statements is true for a contactor used in control cabinet?
1. It is an electronically controlled single brake switch.
2. The controlling circuit of a contactor has much higher power rating than the switched circuit.
3. It is similar to a relay with a lower current rating.
4. It is similar to a relay with a higher current rating.
ANS-4
Q.78 Which of the following statements is true regarding a brushless alternator?
1. The exciter is the smaller alternator with rotating field coils and stationary armature.
2. It consists of two alternators and the smaller of the two represents the main alternator.
3. A three phase brushless alternator does not require diodes to be placed on the rotor side.
4. Apart from the brushes, slip rings are also not needed to feed the current to rotating field coils
ANS-4
Q.79 Which of the following statements is correct regarding a nuclear power plant?
1. Nuclear fission process occurs in a nuclear reactor.
2. The chain reaction in a nuclear reactor is uncontrollable.
3. The moderator consists of cadmium.
4. The control rods are made of graphite.
ANS-1
Q.80 Which of the following statements is correct regarding the testing of electrical equipment?
1. An external growler is used for testing small DC armatures and internal growler for testing large DC armatures.
2. The brake test and Swinburne’s test are two direct methods to test the DC motor and find the efficiency.
3. A short between the terminals of an alternator can be found from the test lamp method.
4. While testing machines, all the delta connected points should be disconnected.
ANS-1
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