Basic Electricity General Knowledge Test Quiz - Set 06

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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