The following statements relate to compensating winding (CW) and interpole winding (IW) of a dc machine : 1. CW neutralizes the armature reaction under a pole pitch 2. IW is connected in series with armature circuit 3. IW produces mmf in the commutating zone only 4. CWmmf is directed along the brush axis 5. Mmf produced by IW is equal to armature mmf From these, the correct statements are

Electrical Machines
The following statements relate to compensating winding (CW) and interpole winding (IW) of a dc machine : 1. CW neutralizes the armature reaction under a pole pitch 2. IW is connected in series with armature circuit 3. IW produces mmf in the commutating zone only 4. CWmmf is directed along the brush axis 5. Mmf produced by IW is equal to armature mmf From these, the correct statements are

1, 3, 4, 5

2, 3, 4, 5

1, 2, 3, 4 and 5

2, 3, 4

1, 3, 4, 5

2, 3, 4, 5

1, 2, 3, 4 and 5

2, 3, 4

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

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

field resistance was higher than critical resistance

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Electrical Machines
The output power of a dc motor is given by

none of these.

EbIa.

EbIa2.

EIa.

none of these.

EbIa.

EbIa2.

EIa.

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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 and 4.

2, 3 and 4.

1, 3 and 4.

1, 2 and 3.

2 and 4.

2, 3 and 4.

1, 3 and 4.

1, 2 and 3.

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

repulsion motor.

asynchronous motor.

transformer.

shunt motor.

repulsion motor.

asynchronous motor.

transformer.

shunt motor.

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

R2 = s2X2.

sR2 = X2.

R2 = s2X2.

R2 = sX2.

R2 = s2X2.

sR2 = X2.

R2 = s2X2.

R2 = sX2.

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Electrical Machines

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 output power of a dc motor is given by

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 A 3 - φ induction motor can also be referred to as a

Electrical Machines When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

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 output power of a dc motor is given by

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
A 3 - φ induction motor can also be referred to as a

Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be