## Electrical Machines When two DC series motors are connected in parallel, the resultant speed is

normal speed.
less than normal speed.
zero.
more than normal speed.

PN/3000.
PN/2.
PN/60.
PN/120.

## Electrical Machines In a 3 - ÃŽÂ¦ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

E1 / E2 = N1kw1 / N2kw2.
E1 / E2 = 1.
E1 / E2 = f1kw1 / f2kw2.
E1 / E2 = N1 / N2.

## Electrical Machines In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting

the damper bars develop synchronous motor torque.
the damper bars develop induction generator torque.
the damper bars develop induction motor torque.
negative sequence currents are generated.

## Electrical Machines For high current and low current rating which winding is employed to DC machine?

Wave winding
Both lap and wave winding
None of above
Lap winding

## Electrical Machines Generators work on the principle of production of

None of these
dynamically induced emf.
statically induced emf.
dynamically and statically induced emf.