SSC JE EE Quiz: Electrical Machine Booster Quiz-12

If the effect of armature reaction is purely demagnetizing, then type of load on a synchronous motor may be

In case 3-ϕ induction motor shaft power is 2700 watt and mechanical losses are 300 watt. At a slip 0.5 p.u. the rotor ohmic losses are

In a round rotor alternator with negligible resistance, reactive power is maximum at a load angle of ________ elec. degrees.

The direction of rotation of a shaded pole motor is

If the secondary voltage is one-third of the primary voltage in a transformer, what is the secondary current?

Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed (in rpm) of the alternators is

Which one of the following is the most efficient method for increasing the speed of 4 kW DC shunt motor?

A dc series motor drawing an armature current of Ia is operating under saturation magnetic conditions. The torque developed in the motor is proportional to

Semi closed slots or totally closed slots are used in induction motors, essentially to