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MCQs 1: In delta connected system, the potential difference between line outers is

Equal to the phase voltage Greater than the phase voltage Less than the phase voltage None of these
Answer Explanation

MCQs 2: By using two wattmeter method, power can be measured in

3 - phase, 2 - wire system 3 - phase, 3 - wire system 3 - phase, 4 - wire system All of these
Answer Explanation

MCQs 3: The two wattmeter method is applicable for

Only star connected system Only delta connected system Both star connected and delta connected system None of these
Answer Explanation

MCQs 4: In a balanced 3-phase system, if one of the two wattmeter’s reading is negative then the

Reading should be taken as it is Reading should be taken after reversing the pressure coil Reading should be taken after reversing the current coil All of these
Answer Explanation

MCQs 5: From full load to no load, the change of terminal voltage is more in case of

Lagging power factor Leading power factor Unity power factor Both lagging and leading power factor compared to unity power factor
Answer Explanation

MCQs 6: The synchronous generator is also called an

AC generator Alternator DC generator Only (a) and (b)
Answer Explanation

MCQs 7: In India, the synchronous generator generates

11 kilo - volts 33 kV 66 kV Either (a) or (b)
Answer Explanation

MCQs 8: The non salient pole type synchronous generator is driven by

Hydraulic turbines Diesel engines Steam engines All of these
Answer Explanation

MCQs 9: The number of cycles of the induced emf per second is equal to

No. of cycles per revolutions x no. of revolutions per second No. of cycles per second x no. of revolutions per second No. of cycles per revolutions x no. of revolutions per hour No. of cycles per revolutions / no. of revolutions per second
Answer Explanation

MCQs 10: Copper losses occurs due to ohmic resistance in

Primary winding Secondary winding Both primary and secondary winding None of these
Answer Explanation

MCQs 11: Efficiency of a transformer is maximum at

Leading power factor Lagging power factor Unity power factor None of these
Answer Explanation

MCQs 12: If the transformer is loaded then the secondary terminal voltage falls for and rises for

Lagging power factor, leading power factor Lagging power factor, unity power factor Unity power factor, lagging power factor Leading power factor, lagging power factor
Answer Explanation

MCQs 13: Copper losses is proportional to

kVA square of kVA cube of kVA none of these
Answer Explanation

MCQs 14: The efficiency of the transformer will be maximum when

Iron losses is equal to the twice of the copper losses Copper losses is equal to the twice of the iron losses Iron losses is equal to the copper losses All of these
Answer Explanation

MCQs 15: The frequency of the induced emf in an induction motor is

Greater than the supply frequency Lesser than the supply frequency Same as the supply frequency None of these
Answer Explanation

MCQs 16: In an induction motor, rotor speed is always

Less than the stator speed More than the stator speed Equal to the stator speed None of these
Answer Explanation

MCQs 17: Slip of an induction motor increases with

increase in current and decrease in torque increase in current and torque decrease in current and torque decrease in current and increase in torque
Answer Explanation

MCQs 18: The frequency of rotor current in an induction motor is

slip times the frequency of stator current slip times the frequency of supply One by slip times the frequency of stator current One by slip times the frequency of supply
Answer Explanation

MCQs 19: Slip ring induction motor has

Low starting torque Medium starting torque High starting torque None of these
Answer Explanation

MCQs 20: Buzzer in principle is a bell

with hammer with gong with both hammer and gong without hammer and gong
Answer Explanation

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