# 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 ANSWER : : slip ring type Explanation :
 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 ANSWER : 1 high inductance arid low resistance Explanation :
 18.In induction motor, percentage slip depends on supply frequency supply voltage copper losses in motor none of the above ANSWER : : copper losses in motor Explanation :
 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 ANSWER : : directly proportional to slip Explanation :
 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 ANSWER : : e.m.f. is injected in the rotor circuit Explanation :

More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages

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