Insertion of reactance in the rotor circuit_______?

Polyphase Induction Motors 18/07/2021

A. reduces starting torque as well as maximum torque
B. increases starting torque as well as maximum torque
C. increases starting torque but maxi-mum torque remains unchanged
D. increases starting torque but maxi-mum torque decreases

Related Mcqs:

    A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________?
    A. 200 Hz B. 50 Hz C. 2 Hz D. 0.2 Hz...
    The crawling in the induction motor is caused by____________?
    A. low voltage supply B. high loads C. harmonics develped in the motor D. improper design of the machine E. none of the above...
    In a three-phase induction motor, the number of poles in the rotor winding is always__________?
    A. zero B. more than the number of poles in stator C. less than number of poles in stator D. equal to number of poles in stator...
    The speed characteristics of an induction motor closely resemble the speedload characteristics of which of the following machines?
    A. D.C. series motor B. D.C. shunt motor C. universal motor D. none of the above...
    When /?2 is the rotor resistance, .X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running conditions will be_____________?
    A. sR2X2 = 1 B. sR2 = X2 C. R2 = sX2 D. R2 = s2X2...

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