SSC JE EE Quiz: Electrical Machine Booster Quiz-21

In  induction motor, power factor at stand-still condition is given by?

If load torque varies with square of speed and terminal voltage of DC shunt motor is halved, then speed.

Choose the correct one for direct on-line starting of the cage induction motor.

Copper loss of a transformer is: -

500V, 50 kVA single-phase alternator has an effective armature resistance of 0.2Ω an excitation current of 10A produce 200A armature current on short circuit and an e.m.f of 400V on open circuit calculate the synchronous reactance.

At normal working condition of  induction motor, curve of the torque-slip characteristic is?

The Leakage flux in a transformer depends upon the value of

A dc shunt generator having a shunt field of 50Ω is generating rated emf at a speed 1000 rpm. The critical field resistance of the machine is 80Ω. Determine the speed at which the generator failed to develop rated emf is: -

Field weakening control method is used for the

Reluctance power of a  salient-pole synchronous motor is given by?