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

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

1, 3, 4, 5

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

700 W

650 W

600 W

625 W

700 W

650 W

600 W

625 W

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Electrical Machines
Wave winding is employed in DC machine of

high current and low voltage rating.

low current and low voltage rating.

high current and low voltage rating.

low current and high voltage rating.

high current and low voltage rating.

low current and low voltage rating.

high current and low voltage rating.

low current and high voltage rating.

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

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

armature resistance, effect of armature reaction.

armature resistance, inter poles, armature.

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

armature resistance, effect of armature reaction.

armature resistance, inter poles, armature.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

θelec = P/2*θmech

θelec = θmech

θelec = 2/P*θmech

θelec = 4/P*θmech

θelec = P/2*θmech

θelec = θmech

θelec = 2/P*θmech

θelec = 4/P*θmech

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

230 V

somewhat more than 230 V

6 V

somewhat less than 230 V

230 V

somewhat more than 230 V

6 V

somewhat less than 230 V

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Electrical Machines

Electrical Machines The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

Electrical Machines Wave winding is employed in DC machine of

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

Electrical Machines For P pole machine relation between electrical degrees and mechanical degrees is

Electrical Machines A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

Electrical Machines
Wave winding is employed in DC machine of

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

Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be