Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

2, 3 and 4.

1, 2 and 3.

2 and 4.

1, 3 and 4.

2, 3 and 4.

1, 2 and 3.

2 and 4.

1, 3 and 4.

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Electrical Machines
Poles of DC machine are often laminated to

reduce pulsation loss.

reduce armature reaction.

dissipate more heat.

reduce iron weight.

reduce pulsation loss.

reduce armature reaction.

dissipate more heat.

reduce iron weight.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

field resistance was higher than critical resistance

there was a break in the armature circuit

field winding was wrongly connected

field system lost residual magnetism

field resistance was higher than critical resistance

there was a break in the armature circuit

field winding was wrongly connected

field system lost residual magnetism

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Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

armature resistance, inter poles, armature.

armature resistance, effect of armature reaction.

reduction in field current, effect of armature reaction, armature.

armature resistance, inter poles, armature.

armature resistance, effect of armature reaction.

reduction in field current, effect of armature reaction, armature.

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Electrical Machines
Which of the following rotor requires damper winding?

None of these

Salient pole rotor.

Cylindrical rotor.

Both type rotor.

None of these

Salient pole rotor.

Cylindrical rotor.

Both type rotor.

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

15 %.

50 %.

10 %.

25 %.

15 %.

50 %.

10 %.

25 %.

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Electrical Machines

Electrical Machines Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines Poles of DC machine are often laminated to

Electrical Machines A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

Electrical Machines The factors that are responsible for decrease in terminal voltage of a shunt generator are

Electrical Machines Which of the following rotor requires damper winding?

Electrical Machines The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

Electrical Machines
Poles of DC machine are often laminated to

Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

Electrical Machines
Which of the following rotor requires damper winding?

Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.