A. high speed steel
B. stainless steel
C. carbon steel
D. cast iron
The shaft of an induction motor is made of_____________? Read More »
Polyphase Induction Motors A. directly proportional to slip
B. inversely proportional to slip
C. proportional to the square of the slip
D. none of the above
The torque of an induction motor is___________? Read More »
Polyphase Induction Motors A. silicon steel
B. cast iron
C. aluminium
D. bronze
The frame of an induction motor is usually made of____________? Read More »
Polyphase Induction Motors A. only if the load current is zero
B. only if the load current is not zero
C. irrespective of the value of load current
D. none of the above
A series generator can self-excite:______________? Read More »
D.C. Generators A. Lenz’s law
B. Ohm’s law
C. Faraday’s law of electromagnetic induction
D. none of the above
A D.C. generator works on the principle of____________? Read More »
D.C. Generators A. will be less than 250 V
B. will always be 250 V
C. may be greater or less than 250 V
D. none of the above
A. 150 V
B. less than 150 V
C. greater than 150 V
D. none of the above
A. only if the resistance of the field circuit is less than critical value
B. only if the resistance of the field circuit is greater than critical value
C. irrespective of the value of the resistance in the field circuit
D. none
A shunt generator can self-excite:_________________? Read More »
D.C. Generators A. 100% regulation
B. infinite regulation
C. 50% regulation
D. 1% regulation
With a D.C. generator which of the following regulation is preferred ? Read More »
D.C. Generators A. 270 V
B. 267.5 V
C. 265 V
D. 257.4 V
