A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

31.1 Ω

31.9 Ω

15.9 Ω

15.1 Ω

31.1 Ω

31.9 Ω

15.9 Ω

15.1 Ω

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

-3.33%

+3.33%

-3%

+3%

-3.33%

+3.33%

-3%

+3%

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Electrical Machines
The stator core of a 3 - ÃŽÂ¦ induction motor is laminated in order to reduce the

eddy current loss.

weight of the stator.

hysteresis loss.

both of the above.

eddy current loss.

weight of the stator.

hysteresis loss.

both of the above.

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

It will rotates in reverse direction.

Fail to start.

Either short circuit or open circuit occurs.

It will rotates in normal operation.

It will rotates in reverse direction.

Fail to start.

Either short circuit or open circuit occurs.

It will rotates in normal operation.

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

500.

0.

2000.

1000.

500.

0.

2000.

1000.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

96 V

192 V

384 V

768 V

96 V

192 V

384 V

768 V

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Electrical Machines

Electrical Machines An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

Electrical Machines The stator core of a 3 - ÃŽÂ¦ induction motor is laminated in order to reduce the

Electrical Machines What happens if fifth multiples of harmonics is given to induction motor?

Electrical Machines A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

Electrical Machines A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

Electrical Machines
The stator core of a 3 - ÃŽÂ¦ induction motor is laminated in order to reduce the

Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is