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:-

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.

2, 3 and 4.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

rating of generators should be same.

terminal voltage should be same.

both A and B.

polarities should be same.

rating of generators should be same.

terminal voltage should be same.

both A and B.

polarities should be same.

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

38%

68%

40%

60%

38%

68%

40%

60%

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

Back emf is equal to half of applied voltage.

back emf is equal to applied voltage.

Back emf is equal.

None of above.

Back emf is equal to half of applied voltage.

back emf is equal to applied voltage.

Back emf is equal.

None of above.

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

150Hz.

200Hz.

100Hz.

50Hz.

150Hz.

200Hz.

100Hz.

50Hz.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

Capacitor split phase motor

Capacitor run motor

Resistance split phase motor

All of these

Capacitor split phase motor

Capacitor run motor

Resistance split phase motor

All of these

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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 Essential conditions for two DC generators are connecting for parallel operation is/are

Electrical Machines A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

Electrical Machines When the mechanical power is developed by a DC motor maximum

Electrical Machines A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

Electrical Machines Which of the following motor is not suitable for frequent starting and stopping?

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
Essential conditions for two DC generators are connecting for parallel operation is/are

Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

Electrical Machines
When the mechanical power is developed by a DC motor maximum

Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?