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UP polytechnic Lecturer (EE) Quiz 30

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Question 1

A 10 pole 25 Hz alternator is directly coupled to and is driven by 60 Hz synchronous motor then the number of poles in a synchronous motor are?

Question 2

The no load input power to a transformer is practically equal to ____ loss in the transformer.

Question 3

The primary and secondary windings of a transformer are wound on the top of each other in order to reduce ___?

Question 4

The reactive power generated by a synchronous alternator can be controlled by?

Question 5

An eight pole wound rotor induction motor operating on 60 Hz supply is driven at 1800 rpm by a prime mover in the opposite direction of revolving magnetic field. The frequency of rotor current is:

Question 6

The motor used on small lathes is usually?

Question 7

Due to some reason if starting capacitor is short circuited in a single-phase induction motor, the following is observed :

Question 8

In a 3 – phase induction motor running at slip ‘s’ the mechanical power developed in terms of air gap power P_g is

Question 9

A 36 MVA, 21 kV, 1800 r.p.m. alternator has a synchronous reactance of

per phase. If the exciting voltage is 12 kV (line-to-neutral) and the system voltage is 17.3 kV (line-to-line), the peak power the machine can deliver before if falls out of step is

Question 10

An 8-pole,

3-phase induction motor has an equivalent rotor resistance of 0.07Ω/phase If its stalling speed is

how much resistance must be included per phase to obtain maximum starting torque? Ignore magnetizing current.

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AE & JE Exams

Nov 12AE & JE Exams