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 net voltage across the armature resistance at the time of plugging will be

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 net voltage across the armature resistance at the time of plugging will be

474 V

234 V

6 V

240 V

474 V

234 V

6 V

240 V

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

remain the same

increase

decrease

become zero

remain the same

increase

decrease

become zero

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Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

Field winding should be properly connected to armature winding.

Field winding resistance should be less than critical resistance.

Poles should contain residual flux.

All of these

Field winding should be properly connected to armature winding.

Field winding resistance should be less than critical resistance.

Poles should contain residual flux.

All of these

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Electrical Machines
In DC machines shape of net flux density is?

peaky in nature

saddle shape

sine wave

flat tapped or trapezoidal

peaky in nature

saddle shape

sine wave

flat tapped or trapezoidal

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Electrical Machines
For standing a DC motor a starter is required because

it limits the starting current to a safe value.

None of these

it limits the speed of the motor.

It starts the motor.

it limits the starting current to a safe value.

None of these

it limits the speed of the motor.

It starts the motor.

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

5 times the synchronous speed.

(1 / 5) times the synchronous speed.

0.5 times the synchronous speed.

(1 / 15) times the synchronous speed.

5 times the synchronous speed.

(1 / 5) times the synchronous speed.

0.5 times the synchronous speed.

(1 / 15) times the synchronous speed.

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Electrical Machines

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 net voltage across the armature resistance at the time of plugging will be

Electrical Machines What is/are the necessary conditions for voltage build up in self excited generator?

Electrical Machines In DC machines shape of net flux density is?

Electrical Machines For standing a DC motor a starter is required because

Electrical Machines The speed of rotation of 5th harmonic component in the stator of an induction motor 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 net voltage across the armature resistance at the time of plugging will be

Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

Electrical Machines
In DC machines shape of net flux density is?

Electrical Machines
For standing a DC motor a starter is required because

Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is