The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

2, 4

1, 3

1, 4

2, 3

2, 4

1, 3

1, 4

2, 3

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Electrical Machines
The use of higher flux density in the transformer design

None of these

has no relation with the weight of transformer

reduces the weigh per KVA

increases the weigh per KVA

None of these

has no relation with the weight of transformer

reduces the weigh per KVA

increases the weigh per KVA

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

modified.

increased.

none of these.

reversed.

modified.

increased.

none of these.

reversed.

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Electrical Machines
Commutation in a DC machine may be explained as a process

by which electric current in a coil is reversed.

how alternate flux affects the main field flux.

in which magnetic field is set up.

by virtue of which emf is induced in the armature conductors.

by which electric current in a coil is reversed.

how alternate flux affects the main field flux.

in which magnetic field is set up.

by virtue of which emf is induced in the armature conductors.

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

The speed of motor.

The torque required.

The voltage across the terminals.

None of above.

The speed of motor.

The torque required.

The voltage across the terminals.

None of above.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

2, 3, 4

1, 2, 3, 4

1, 3, 5

1, 2, 5

2, 3, 4

1, 2, 3, 4

1, 3, 5

1, 2, 5

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Electrical Machines

Electrical Machines The use of higher flux density in the transformer design

Electrical Machines The power flow of a dc motor, with respect to a DC generator is

Electrical Machines Commutation in a DC machine may be explained as a process

Electrical Machines The current drawn by the armature of DC motor is directly proportional to

Electrical Machines
The use of higher flux density in the transformer design

Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

Electrical Machines
Commutation in a DC machine may be explained as a process

Electrical Machines
The current drawn by the armature of DC motor is directly proportional to