## Electrical Machines In case of IM the torque is

directly proportional to slip2.
directly proportional to slip.
inversely proportional to Ã¢Ë†Å¡slip.
inversely proportional to slip.

## Electrical Machines A simple method of increasing the voltage of a DC generator is to

increase the number of turns in armature coil.
increase the number of turns in field coil.
increase the source frequency.
increase the speed of shaft rotation.

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

All of these
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
EMF per turn in both the windings are equal

## Electrical Machines With the increases in field excitation of a DC generator, its generated emf

increases upto a limit and then remains almost constant.
increases.
remains constant.
decreases.

## Electrical Machines During hunting of a synchronous motor

field excitation increases.
negative phase sequence currents are generated.
damper bar develops torque.
harmonic are developed in the armature circuit.

## Electrical Machines The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Xd = 9Ω and Xq = 9.6Ω
Xd = 9.6Ω and Xq = 9Ω
Xd = 8Ω and Xq = 10.8Ω
Xd = 10.8Ω and Xq = 8Ω