Consider the following statements regarding the magnetization characteristics of a dc generator : 1. It represents the variation of field flux with field current. 2. Variation of open-circuit terminal voltage with field current is independent of speed 3. It is non-linear from zero to rated field current 4. It helps to determine the critical field resistance at a given speed 5. It always starts from the origin Which of these statements are correct ?

Electrical Machines
Consider the following statements regarding the magnetization characteristics of a dc generator : 1. It represents the variation of field flux with field current. 2. Variation of open-circuit terminal voltage with field current is independent of speed 3. It is non-linear from zero to rated field current 4. It helps to determine the critical field resistance at a given speed 5. It always starts from the origin Which of these statements are correct ?

1 and 4

3 and 5

1, 2 and 5

2, 3 and 4

1 and 4

3 and 5

1, 2 and 5

2, 3 and 4

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

cumulatively compounded.

shunt connected.

differentially compounded.

separately excited.

cumulatively compounded.

shunt connected.

differentially compounded.

separately excited.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

stator of a induction machine.

rotor of a dc machine.

rotor of an synchronous machine.

stator of a dc machine.

stator of a induction machine.

rotor of a dc machine.

rotor of an synchronous machine.

stator of a dc machine.

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Electrical Machines
In DC machines, the interpoles are provided

both (B) and (C).

to counteract demagnetizing effect of armature mmf in commutating zone.

to make commutation spark less.

to counteract the reactance voltage and the cross-magnetizi

both (B) and (C).

to counteract demagnetizing effect of armature mmf in commutating zone.

to make commutation spark less.

to counteract the reactance voltage and the cross-magnetizi

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

crawling.

cogging.

plugging.

locking.

crawling.

cogging.

plugging.

locking.

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Electrical Machines
The emf induced in the dc generator armature winding is

AC and DC

None of these

DC

AC

AC and DC

None of these

DC

AC

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Electrical Machines

Electrical Machines For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

Electrical Machines A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

Electrical Machines In DC machines, the interpoles are provided

Electrical Machines An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

Electrical Machines The emf induced in the dc generator armature winding is

Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

Electrical Machines
In DC machines, the interpoles are provided

Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

Electrical Machines
The emf induced in the dc generator armature winding is