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.

1, 3 and 4.

2, 3 and 4.

2 and 4.

1, 2 and 3.

1, 3 and 4.

2, 3 and 4.

2 and 4.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

normal speed.

any of the above.

synchronous speed.

slip speed.

normal speed.

any of the above.

synchronous speed.

slip speed.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

1000 rpm, 950 rpm.

1000 rpm, - 50 rpm.

zero , - 50 rpm.

zero, 950 rpm.

1000 rpm, 950 rpm.

1000 rpm, - 50 rpm.

zero , - 50 rpm.

zero, 950 rpm.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

rectangular.

triangular.

sinusoidal.

trapezoidal.

rectangular.

triangular.

sinusoidal.

trapezoidal.

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

1, 2 and 3

2 and 3

1 and 2

1 and 3

1, 2 and 3

2 and 3

1 and 2

1 and 3

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Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

All of these

Field winding should be properly connected to armature winding.

Poles should contain residual flux.

Field winding resistance should be less than critical resistance.

All of these

Field winding should be properly connected to armature winding.

Poles should contain residual flux.

Field winding resistance should be less than critical resistance.

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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 For a standard frequency the machine operates at a particular speed known as

Electrical Machines A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

Electrical Machines The armature reaction mmf in a DC machines has a form of

Electrical Machines What is/are the necessary conditions for voltage build up in self excited generator?

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
For a standard frequency the machine operates at a particular speed known as

Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

Electrical Machines
The armature reaction mmf in a DC machines has a form of

Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?