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 :

Electrical Machines
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 :

1, 2 and 3

1 and 2

2 and 3

1 and 3

1, 2 and 3

1 and 2

2 and 3

1 and 3

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Electrical Machines
The inertia constant H of a synchronous condenser is

none of these.

greater than that of hydro generator.

greater than that of turbo alternator.

equal to that of the effective length of the line.

none of these.

greater than that of hydro generator.

greater than that of turbo alternator.

equal to that of the effective length of the line.

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Electrical Machines
The brushes of a DC machine should be placed on the

armature midway between poles.

commutator in the inter polar axis.

commutator in the polar axis.

armature in the polar axis.

armature midway between poles.

commutator in the inter polar axis.

commutator in the polar axis.

armature in the polar axis.

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Electrical Machines
The direction of rotation of a 3 - ÃŽÂ¦ induction motor can be reversed by

disconnecting any one phase.

transposing all the three leads from the supply.

transposing any two leads from supply.

transposing any two leads from slip rings.

disconnecting any one phase.

transposing all the three leads from the supply.

transposing any two leads from supply.

transposing any two leads from slip rings.

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Electrical Machines
Which machine is used for battery charging?

DC series generator.

Compounded DC generator.

None of these.

DC shunt generator.

DC series generator.

Compounded DC generator.

None of these.

DC shunt generator.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

motor armature terminal.

motor field terminal.

generator field terminal.

generator armature terminal.

motor armature terminal.

motor field terminal.

generator field terminal.

generator armature terminal.

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Electrical Machines

Electrical Machines The inertia constant H of a synchronous condenser is

Electrical Machines The brushes of a DC machine should be placed on the

Electrical Machines The direction of rotation of a 3 - ÃŽÂ¦ induction motor can be reversed by

Electrical Machines Which machine is used for battery charging?

Electrical Machines In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

Electrical Machines
The inertia constant H of a synchronous condenser is

Electrical Machines
The brushes of a DC machine should be placed on the

Electrical Machines
The direction of rotation of a 3 - ÃŽÂ¦ induction motor can be reversed by

Electrical Machines
Which machine is used for battery charging?

Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the