Electrical Engineering Questions And Answers :: Polyphase Induction Motors: part4

Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part4 : 16 to 20

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

16.For driving high inertia loods best type of induction motor suggested is

slip ring type
squirrel cage type
any of the above
none of the above

17.When /?2 is tne rotor resistance, .X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condi-tions will be

sR2X2 = 1 (b) sR2 = X2
R2 = sX2 id) R2 = s2X2
R2 = sX2 id) R2 = s2X2
In case of a double cage induction motor, the inner cage has

18.In induction motor, percentage slip depends on

supply frequency
supply voltage
copper losses in motor
none of the above

19.The torque of an induction motor is

directly proportional to slip
inversely proportional to slip
proportional to the square of the slip
none of the above

20.An induction motor can run at synchronous speed when

it is run on load
it is run in reverse direction
it is run on voltage higher than the rated voltage
e.m.f. is injected in the rotor circuit

More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages

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