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SSC JE EE Quiz: Electrical Machine Booster Quiz-14

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Question 1

A three-phase slip ring induction motor is fed from the rotor side with stator winding short circuited. The frequency of currents flowing in short circuited stator is

Question 2

A transformer has 2% resistance and 5% reactance, voltage regulation at

of full load at 0.6 power factor leading is?

Question 3

For an induction motor, synchronous speed and rotor speed are 750 rpm and 710 rpm respectively its slip is ____________.

Question 4

A transformer on no-load is switched on to a source of voltage. It will draw a current ———.

Question 5

A DC shunt motor is excited from voltage source and its brush axis rotated by an angle ‘

’ from the geometrical neutral axis. The torque developed will be proportional to :

Question 6

For a magnetic circuit used in an electric machine, flux generated is 0.25mWb and reluctance is 3.9 × 10⁶. Generated MMF is __________ AT.

Question 7

Regarding armature reaction reactance of salient pole synchronous generator Which of the following is correct?

Question 8

If ratio of starting to maximum torque is 0.8 for an induction machine. Then, slip at maximum torque is ___________

Question 9

If I_a is the armature current of a DC series motor, then the ratio of torque developed by motor for small value of current and torque developed by motor for higher value of armature current is

Question 10

Power input to a transformer on no-load at rated voltage comprises predominantly of

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