G.K. Practice Test: Question Set - 06
1. An induction motor is
- (A) Self-starting
with zero torque
- (B) Self-starting
with high torque
- (C) Self-starting
with small torque than rated torque
- (D) Self-starting
with infinite torque
2. Full load current of a 10 HP, 3 phase, 440 V induction motor is of the order of
- (A) 7 A
- (B) 14 A
- (C) 21 A
- (D) 28 A
3. The starting current by a delta connected induction motor as compared to star connected motor under all other identical conditions is
- (A) Same
- (B) 2 times
- (C) 3 times
- (D) ½ times
4. The rotor slots are usually given slight skew in the squirrel cage induction motor
- (A) To
increase the tensile strength of the rotor bars and hence strength
- (B) To reduce
the magnetic hum and locking tendency of the rotor
- (C) To save the
copper used
- (D) Because of
case in fabrication
5. The class C insulation can withstand
- (A) 180 °C
- (B) 150 °C
- (C) 200 °C
- (D) 105 °C
6. The untreated paper falls in the following class of insulation
- (A) A
- (B) B
- (C) E
- (D) O
7. Mica tape falls under the following class of insulation
- (A) A
- (B) B
- (C) E
- (D) H
8. The material used for fuse must have
- (A) Low melting
point and low specific resistance
- (B) Low melting
point and high specific resistance
- (C) High melting
point and low specific resistance
- (D) Low melting
point with any specific resistance
9. The Buchhloz relay is used to protect the
- (A) Alternators
against all internal faults
- (B) Oil
immersed transformers against all internal faults
- (C) Synchronous
motor against all internal faults
- (D) Transmission
lines against all short-circuit faults
10. The earthing transformer is used
- (A) To avoid the
harmonics in the transformer
- (B) To
provide artificial neutral earthing where the neutral points of the three phase
system are not accessible
- (C) To
improve the current capacity of the neutral wire
- (D) To improve
efficiency
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