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 ?

2, 3 and 4

3 and 5

1, 2 and 5

1 and 4

2, 3 and 4

3 and 5

1, 2 and 5

1 and 4

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Electrical Machines
The constant losses in transformer is/are

both 2 and 3.

eddy current loss.

hysteresis loss.

copper loss.

both 2 and 3.

eddy current loss.

hysteresis loss.

copper loss.

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Electrical Machines
The armature of DC motor is laminated

to reduce the eddy current loss.

to reduce the hysteresis loss.

to reduce the inductor.

to reduce the mass.

to reduce the eddy current loss.

to reduce the hysteresis loss.

to reduce the inductor.

to reduce the mass.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

Open fuse or circuit breaker.

Develop excessive speed and damage itself.

Draw too much current.

Produce sparking at brushes.

Open fuse or circuit breaker.

Develop excessive speed and damage itself.

Draw too much current.

Produce sparking at brushes.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

4575.4 r.p.m.

1130 r.p.m.

none of above.

1037.5 r.p.m.

4575.4 r.p.m.

1130 r.p.m.

none of above.

1037.5 r.p.m.

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

radiation.

All of these

convection.

conduction.

radiation.

All of these

convection.

conduction.

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Electrical Machines

Electrical Machines The constant losses in transformer is/are

Electrical Machines The armature of DC motor is laminated

Electrical Machines A large series motor is never started without some mechanical on it because otherwise it will

Electrical Machines For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

Electrical Machines The heat generated in the transformer is dissipated mainly by

Electrical Machines
The constant losses in transformer is/are

Electrical Machines
The armature of DC motor is laminated

Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

Electrical Machines
The heat generated in the transformer is dissipated mainly by