Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

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Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

2 and 3

1 and 3

1, 2 and 3

1 and 2

2 and 3

1 and 3

1, 2 and 3

1 and 2

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A 3 - ÃŽÂ¦ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

50.

80.

36.

18.

50.

80.

36.

18.

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High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

shunt field

armature circuit

none of above

both A and B

shunt field

armature circuit

none of above

both A and B

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

Field winding should be properly connected to armature winding.

Poles should contain residual flux.

All of these

Field winding resistance should be less than critical resistance.

Field winding should be properly connected to armature winding.

Poles should contain residual flux.

All of these

Field winding resistance should be less than critical resistance.

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Short circuiting is caused in the armature winding due to

any of above.

failure of insulation between two turns of coil.

grounding of two or more turns of the same coil.

failure of insulation between two commutator bars.

any of above.

failure of insulation between two turns of coil.

grounding of two or more turns of the same coil.

failure of insulation between two commutator bars.

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The output voltage of a DC generator is

E = V + IaRa.

E = V Ã¢â‚¬â€œ IaRa.

E = V + Ia.

E = V + Ra.

E = V + IaRa.

E = V Ã¢â‚¬â€œ IaRa.

E = V + Ia.

E = V + Ra.

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Electrical Machines

Electrical Machines A 3 - ÃŽÂ¦ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

Electrical Machines High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

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

Electrical Machines Short circuiting is caused in the armature winding due to

Electrical Machines The output voltage of a DC generator is

Electrical Machines
A 3 - ÃŽÂ¦ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

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

Electrical Machines
Short circuiting is caused in the armature winding due to

Electrical Machines
The output voltage of a DC generator is