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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 Pg 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 ExamsNov 12AE & JE Exams