Insertion of resistance in the rotor of an induction motor to develop a given torque?

Related Mcqs:

In medium sized induction motors, the slip is generally around___________?

A. 0.04% B. 0.4% C. 4% D. 14%...

The torque developed in the cage induction motor with autostarter is___________?

A. k/torque with direct switching B. K x torque with direct switching C. K2 x torque with direct switching D. k2/torque with direct switching...

Size of a high speed motor as compared to low speed motor for the same H.P. will be__________?

A. bigger B. smaller C. same D. any of the above...

A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be__________?

A. 0.01 B. 0.02 C. 0.03 D. 0.04...

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...