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1.Which of the following statements related to the efficiency of a DC generator when its variable losses are equal to the constant losses is correct?
1. Double of the maximum efficiency
2. Maximum efficiency
3. Half of the maximum efficiency
4. Full load efficiency
Ans-2
2. What happened If the AC over load relay used to DC supply?
1. will draw less current
2. will draw more current in the absence of inductive reactance
3. will not work
4. will draw same current
Ans-2
3.How many lead acid cells are to be grouped for 12 V battery and how to connect?
1. 12 cells in parallel
2. 6 cells in series
3. 12 cells in series
4. 6 cells in parallel
Ans-2
4. Which of the following precautions must NOT be taken during wiring installation?
1. Use earth wire of any gauge
2. Fix switchboards at a proper height
3. Don’t exceed the load on the circuit
4. Carry out the wiring on the distribution system
Ans-1
5.Special silicon steel/ alloy steel is used for iron core in power transformers to reduce :
1. Eddy current losses
2. Copper losses
3. Friction losses
4. Hysteresis losses
Ans-4
6. Which of the following precautions must NOT be taken while storing magnets?
1. Use a keeper
2. Store in a dry place
3. Store in pairs
4. Store in a ferromagnetic container
Ans-4
7. The formula to define the frequency of an alternator is ______.
1. F=60 N/p
2. F=120 P/N
3. F=PN/120
4. F=PN/60
Ans-3
8.Which is one of the advantages of digital multimeter than analogue multimeter?
1. More expensive than an analogue multi tool.
2. The digital display can wear out the battery life of the digital option
3. Gives accurate reading than analogue multimeter
4. The digital meter can sometimes get overheated
Ans-3
9. Which type of wiring system is shown in the given figure?
1. Joint box wiring system
2. Casing and Capping Wiring system
3. Loop wiring system
4. Contact loop wiring system
Ans-1
10.What is the function of synchro scope?
1. Indicate the correct phase sequence of the incoming alternator and busbar
2. Connect the incoming alternator to the busbar
3. Indicate the correct instance of synchronizing two alternators
4. Adjust the frequency of incoming alternator
Ans- 3
11. Which type of diode is shown in the figure ?
1. Pin Diode
2. Tunnel diode
3. Photo diode
4. PN junction diode
Ans-3
12.Which of the following is not a drive?
1. Field drives
2. DC drives
3. Eddy current drives
4. AC drives
Ans-1
13.In alternator, the armature core is laminated to reduce the ______.
1. Copper losses
2. Hysteresis losses
3. Eddy current losses
4. Iron losses
Ans-3
14.Which type of converter can work as a DC motor, AC motor, converter and inverter?
1. Rotary Converter
2. AC voltage regulator
3. Metal plate rectifier
4. Mercury arc rectifier
Ans-1
15.Which packaged transistors are generally used in medium and high-power amplifications?
1. Plastic
2. Ceramic
3. Paper
4. Metal
Ans-4
16.Which parameter is not related to an AC circuit?
1. RMS Value
2. Peak to peak value
3. Form Factor
4. Cultivation of wave
Ans-4
17.What is the phase voltage in delta connected 3 phase system if the line voltage is 252 V and the line current is 6 A?
1. 436.47 V
2. 252 V
3. 145.50 V
4. 504 V
Ans-2
18.What happens when an electrolytic type of capacitor is connected with incorrect polarity of DC supply?
1. Capacitor work properly
2. Doesn’t affect the capacitor
3. Capacitor work opposite direction
4. Permanently damaged the capacitor
Ans-4
19.Which motor has similar speed-load characteristics as that of a universal motor?
1. DC shunt motor
2. AC synchronous motor
3. DC series motor
4. AC squirrel cage motor
Ans-3
20.In a nuclear generating station, the ______ process is used in the first step.
1. Isotopes
2. Reaction
3. Fusion
4. Fission
Ans-4
21.In a three-phase induction motor, which speed called actual speed?
1. Speed of the flux produced in rotor
2. Speed of the rotor
3. Speed of the stator
4. Speed of the rotating magnetic field
Ans-2
22.identyfy the filter name given the circuit?
1. High pass
2. Bandstop
3. Low pass
4. Band Pass
Ans-1
23.What is the line voltage for a three-phase balanced star connected system, having a phase voltage of 240 V?
1. 480.7 V
2. 250.7 V
3. 415.7 V
4. 120.7 V
Ans-3
24. What is the peak to peak to value of a voltage in an ac circuit if the rms value of voltage is (230✓2 )V ?
1. 842 V
2. 355 V
3. 660 V
4. 115 V
Ans-3
25.For improving the earth resistance by treating the soil, which chemical is not used?
1. Copper sulphate (Blue vitriol)
2. Potassium nitrate (Saltpeter )
3. Sulphur hexafluoride (electronegative)
4. Magnesium sulphate (Epsom salts)
Ans-3
26.What is the form factor of half-wave rectified sine wave?[¥=pi]
1. (¥/2)✓2
2. 2¥/✓3
3. ¥/2
4. (2/¥)✓3
Ans-3
27.In electric railway engine, capacity of universal motor is ______.
1. 200 HP
2. 100 HP
3. 1200 HP
4. 2200 HP
Ans-4
28.For Three phase power and Lighting load, the types of Cable must be:
1. Four Core
2. Three & half Core
3. Three Core
4. Two and half Core
Ans-1
29.As per BIS rules, a meter board and main switch board must be installed at a height of ____from the ground level.
1. 2.5 meter
2. 2.75 meter
3. 1.5 meter
4. 2.0 meter
Ans-3
30.For series lighting, how many 6 V bulbs are required for 240 V supply?
1. 30
2. 42
3. 40
4. 36
Ans-3
31.Which quantities of synchronous motor are used to draw the V curve?
1. Armature Voltage and field Voltage
2. Armature current and field current
3. Armature current and voltage
4. Field current and voltage
Ans-2
32.Which of the following capacitor is a polarized capacitor?
1. Ceramic Capacitors
2. Tantalum Electrolytic Capacitors
3. Dielectric Capacitors
4. Film Capacitor Type
Ans-2
33.Which type of precautions is not important for the installation of electric cables?
1. Cables and wirings for emergency equipment, lightings, communication, and the signal should be kept away from spaces like galley, laundries, machinery space of category A & other high-risk areas.
2. Avoid cable for damage and chafing during installation.
3. Installed in such a manner that it should not interfere with the original
flame retarding properties.
4. Terminations and joints are to be made that it should decrease its original fire-
resisting properties.
Ans-3
34.The starting torque of universal motor is ______.
1. 200 Percent of running torque
2. 50 Percent of running torque
3. 100 Percent of running torque
4. 450 Percent of running torque
Ans-4
35.Which of the following formulas correctly expresses the current at maximum efficiency in a
DC motor?
1. Constant loss× ✓full load current/full load copper loss
2. Full load copper loss×✓constant loss/full load current
3. Full load current ×✓full load copper loss/constant loss
4. Full load current ×✓constant loss/full load copper loas
Ans-4
1. Low current flow & fire
2. No current flow & no fire
3. High current flow & fire
4. Low current flow & no fire
Ans-3
37.Which type of light recommended for offices & other specific purpose?
1. Indirect
2. Direct
3. Semi-indirect
4. Semi-direct
Ans-4
38. What is the cut of frequency of the single passive high pass filter if 240 kohm resistance connected with series with a capacitor of 82 pf?
1. 600 Hz
2. 9.235 kHz
3. 6358 Hz
4. 8.087 kHz
Ans-4
39.If DC supply is fed in universal motor than it works as _____.
1. A DC series motor
2. A AC series motor
3. A DC shunt motor
4. A AC induction motor
Ans-1
40.What happens when a DC motor is started without a starter?
1. High back emf is produced.
2. Doesn’t damage the armature
3. High current flows through the starter.
4. Resistance in the armature is increased.
Ans-3
41. What would be the speed of an induction machine operating in generation mode?
1. No effect of synchronous speed
2. Runs below the synchronous speed
3. Runs equals the synchronous speed
4. Runs above the synchronous speed
Ans-4
42.identify the measureing method employ in the given figure?
1. 3 phase, 3 wattmeter method
2. 3 phase, 2 wattmeter method
3. 3 phase, reactive power method
4. 2 phase, 2 wattmeter method
Ans-2
43.the emf equation of alternator is ______.
1. 4.44 ¥FT volt
2. 2.22 ¥FT volt
3. 2.44 ¥FT volt
4. 4.22 ¥FT volt
Ans-1
44. A current transformer with split core, when used in conjunction with a recording meter is called as ______.
1. Clamp meters
2. Frequency meter
3. Energy meter
4. Watt meter
Ans- 1
45. Spinning motion of electrons gives rise to which of the following?
1. Wattage in the magnetic generator
2. Magnetism in magnet.
3. Motion of magnet
4. Electricity in the conductor
Ans-2
46. Identify the single phase starting method shown in the figure?
1. Electronic Starter
2. Split Phase
3. Permanent Split Capacitor hi
4. Capacitor Starter
Ans-2
47. Among the following, which is the variable loss?
1. Brush friction losses
2. Mechanical losses
3. Copper losses
4. Iron or core losses
Ans-3
48. From the options given, choose one of the advantages of the universal motor?
1. Cause electromagnetic television and radio interference
2. Require frequent service and maintenance
3. Run at adjustable speeds
4. Relatively higher noise
Ans-3
49.The product of root means square (RMS) value of voltage and current is known as ______.
1. Apparent power
2. Real Power
3. Reactive power
4. Active power
Ans-1
50.What is the disadvantage of the speed control of DC motor by armature voltage control?
1. Electric braking can be applied easily
2. Simple and easy speed control method.
3. Cost of controlling device is high
4. Pollution-free
Ans-3
