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AE & JE EE Quiz: Electrical Machine Booster Quiz-1

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Question 1

Rotor slot of the squirrel cage induction motor are skewed slightly, so as to

Question 2

Which of the following is/are disadvantages of auto transformers?

1. If the transformation ration differs far from unity, the economic advantages of autotransformer over two winding transformer decreases.

2. The short circuit current in an auto transformer is higher than that in a corresponding two winding transformer.

Question 3

Which of the following would refer to an ideal transformer?

1) Winding-resistances are negligible

2) Leakage-fluxes are included

3) Core-losses are negligible

4) Magnetization characteristic is linear

Question 4

When the load on an induction motor is increased from no-load to full load then

Question 5

Consider the following statements regarding parallel connection of 3-phase transformers:
1) The secondary’s of all transformers must have the same phase sequence.
2) The phase displacement between primary and secondary line voltages must be the same for all transformers which are to be operated in parallel.
3) The primaries of all transformers must have the same magnitude of line voltage.
Which of the above statements are correct?

Question 6

In generating mode, an induction machine operates as a generator with a shaft speed which is greater than the synchronous speed, if the slip is

Question 7

Eddy current loss in transformer depends on:

Question 8

Cogging in an induction motor is caused

Question 9

The slip of an induction motor while conducting blocked rotor test will be:

Question 10

In a 3ϕ induction motor, rotor is rotating at speed of N_r(rpm), stator flux is rotating at speed of N_s(rpm), then speed of stator flux with respect to rotor is

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AE & JE Exams

Dec 8AE & JE Exams