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, 2 and 5

2, 3 and 4

1 and 4

3 and 5

1, 2 and 5

2, 3 and 4

1 and 4

3 and 5

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

112.5 W

50 W

168.75 W

75 W

112.5 W

50 W

168.75 W

75 W

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

run at very high speed.

run at very low speed.

burn.

start haunting.

run at very high speed.

run at very low speed.

burn.

start haunting.

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

Differential compound.

Series.

Cummulative compound.

Shunt.

Differential compound.

Series.

Cummulative compound.

Shunt.

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

B is bigger than A for the same current rating

A is bigger than B for the same current rating

both are of the same size for the same current rating

A is bigger than B for the same voltage rating

B is bigger than A for the same current rating

A is bigger than B for the same current rating

both are of the same size for the same current rating

A is bigger than B for the same voltage rating

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

400W

300 W

250 W

500 W

400W

300 W

250 W

500 W

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Electrical Machines

Electrical Machines A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

Electrical Machines If the back emf in DC motor vanishes suddenly the motor will

Electrical Machines For the same power output rating and full load speed, the motor will have poorest starting torque, is

Electrical Machines Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

Electrical Machines A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is