DOL starting of induction motors is usually restricted to_____________?

Related Mcqs:

The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type__________?

A. star connected only B. delta connected only C. A. and B. both D. none of the above...

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...

The stating torque of the slip ring induction motor can be increased by adding__________?

A. external inductance to the rotor B. external resistance to the rotor C. external capacitance to the rotor D. both resistance and inductance to rotor...

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...