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

2, 3, 4, 5

1, 2, 3, 4 and 5

1, 3, 4, 5

2, 3, 4

2, 3, 4, 5

1, 2, 3, 4 and 5

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

300 V.

150 V.

200 V.

223.V.

300 V.

150 V.

200 V.

223.V.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

increased by 20%

reduced by 10%

increased by 10%

reduced by 20%

increased by 20%

reduced by 10%

increased by 10%

reduced by 20%

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Electrical Machines
Cogging of induction motor occurs at

low voltage and when stator and rotor poles are equal.

high voltage and when stator and rotor poles are not equal.

low voltage and when stator and rotor poles are not equal.

high voltage and when stator and rotor poles are equal.

low voltage and when stator and rotor poles are equal.

high voltage and when stator and rotor poles are not equal.

low voltage and when stator and rotor poles are not equal.

high voltage and when stator and rotor poles are equal.

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Electrical Machines
Lamination of transformer core is made of

cast steel.

silicon steel.

cast iron.

wrought iron.

cast steel.

silicon steel.

cast iron.

wrought iron.

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Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

10

24

5

12

10

24

5

12

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Electrical Machines

Electrical Machines Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

Electrical Machines To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

Electrical Machines Cogging of induction motor occurs at

Electrical Machines Lamination of transformer core is made of

Electrical Machines Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

Electrical Machines
Cogging of induction motor occurs at

Electrical Machines
Lamination of transformer core is made of

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?