Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

1, 2 and 3

1 and 2

2 alone

1 and 3

1, 2 and 3

1 and 2

2 alone

1 and 3

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The constant losses in transformer is/are

eddy current loss.

hysteresis loss.

both 2 and 3.

copper loss.

eddy current loss.

hysteresis loss.

both 2 and 3.

copper loss.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

1.06

0.87

0.95

0.96

1.06

0.87

0.95

0.96

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Dummy coils are used for

mechanical balancing.

All of these

increasing efficiency.

reducing armature reaction.

mechanical balancing.

All of these

increasing efficiency.

reducing armature reaction.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Which of the following machine will have maximum efficiency?

DC motor.

Electrical power transformer.

Electrical power generator.

Induction motor.

DC motor.

Electrical power transformer.

Electrical power generator.

Induction motor.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The coil spam

may or may not be exactly equal to people pitch.

must be exactly equal to people pitch.

can never be equal to pole pitch.

none of above.

may or may not be exactly equal to people pitch.

must be exactly equal to people pitch.

can never be equal to pole pitch.

none of above.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines

Electrical Machines Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

Electrical Machines The constant losses in transformer is/are

Electrical Machines A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines Dummy coils are used for

Electrical Machines Which of the following machine will have maximum efficiency?

Electrical Machines The coil spam

Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

Electrical Machines
The constant losses in transformer is/are

Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines
Dummy coils are used for

Electrical Machines
Which of the following machine will have maximum efficiency?

Electrical Machines
The coil spam