Electrical machine MCQ #6

1) The number of parallel paths in wave winding of machine is

      (a) 2

      (b) 4

      (c) 6

      (d) 8

2) The number of bushings in a transformer can be reduced if the tapping is provided ______.

      (a) on the low voltage side

      (b) at the phase ends

      (c) in middle of the transformer

      (d) at the high voltage side

3) Which of the following generating machine will offer constant voltage on all loads?

      (a) Level compound generator

      (b) Self-excited generator

      (c) Separately excited generator

      (d) All the above machines

4) The good power factor of an induction motor can be achieved if the average flux density in the air gap is

      (a) Large

      (b) Absent

      (c) Infinity

      (d) Small

ANSWER: | 1-a | 2-b | 3-a | 4-d |

5) The back emf of the motor will __________ if the speed of a DC shunt motor is increased,

      (a) Decrease

      (b) Increase

      (c) Increase then decrease

      (d) Remain the same

6) Which of the following machine will be preferred to charge the batteries?

      (a) Series generator

      (b) Compound generator

      (c) Series motor

      (d) Shunt generator

7) An induction motor with 1000 rpm speed will have

      (a) 2 poles

      (b) 4 poles

      (c) 6 poles

      (d) 8 poles

8) Slip of an induction Motor at Starting

      (a) 0 

      (b) 1 

      (c) 0.5 

      (d) 0.3

ANSWER: | 5-b | 6-d | 7-c | 8-b |

9) Squirrel Cage Induction Motor is having 

      (a) High Starting Torque   

      (b) Low Starting Torque 

      (c) Both A&B   

      (d) None of these

10) Voltage Regulation is

      (a) E-V/V

      (b) V-E/V

      (c) E-V/E

      (d) V-E/E

11) Which of the material is used to insulate the segments of commutator?

      (a) Fiberglass

      (b) Plastic

      (c) Mica

      (d) PVC

12) The brushes of electrical machines are made of

      (a) Carbon

      (b) Copper

      (c) Cast iron

      (d) Steel

ANSWER: | 9-b | 10-a | 11-c | 12-a |

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