## Electrical Machines Which of the following is/are the methods to reduce the armature reaction and its effects?

pole stacking
pole chamfering
All of these
compensating winding

## Electrical Machines A DC compound motor has

both shunt and series field winding.
tertiary winding.
only shunt field winding.
only series field winding.

## Electrical Machines Which of the following statements is/are correct statements?

EMF per turn in both the windings are equal
EMF per turn in HV winding is less than EMF per turn in LV winding
EMF per turn in HV winding is more than EMF per turn in LV winding
All of these

## Electrical Machines For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

None of above.
Decreases.
Increases.
Remain unchanged

## Electrical Machines The rotor speed of an induction motor is given by

None of these
Ns = 120f / p Ãƒâ€” ( 1 - s ).
Nr = 120f / p Ãƒâ€” (1-s).
Ns = 120f /p Ãƒâ€” ( 1 - r).

## Electrical Machines A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

can not be determined.
234.76 N-m.
266.20 N-m.
133.22 N-m