## Electrical Machines When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

switched reluctance motor.
DC motor.
induction motor.
variable reluctance motor.

## Electrical Machines In a transformer, hysteresis and eddy current losses depend upon

both 2 and 3
maximum flux density
supply frequency

## Electrical Machines In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

Rotor mmf wave.
Rotor winding.
Both rotor and stator winding.
Stator winding.

## Electrical Machines Armature reaction in DC generators will result in

increase in slip.
open circuit.
short circuit.
reduction in generated emf.

## Electrical Machines A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

P = 60, s = 0.96 %.
P = 40, s = 5.79 %.
P = 20, s = 3.33 %.
P = 50, s = 4.43 %.

## Electrical Machines The type of DC motor generally used for shears and punches is

Differential compound motor.
Cummulative compound motor.
Series motor.
Shunt motor.