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

2, 3, 4

1, 2, 3, 4 and 5

1, 3, 4, 5

2, 3, 4, 5

2, 3, 4

1, 2, 3, 4 and 5

1, 3, 4, 5

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

none of above.

1037.5 r.p.m.

1130 r.p.m.

4575.4 r.p.m.

none of above.

1037.5 r.p.m.

1130 r.p.m.

4575.4 r.p.m.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

armature reaction.

residual magnetism.

permanent magnets.

None of these

armature reaction.

residual magnetism.

permanent magnets.

None of these

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

40%

5%

10%

19%

40%

5%

10%

19%

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Electrical Machines
Cogging in induction motor occurs when

number of stator teeth - number of rotor teeth = odd number.

number of stator teeth - number of rotor teeth = 0.

number of stator teeth - number of rotor teeth = even number.

number of stator teeth - number of rotor teeth = negative number.

number of stator teeth - number of rotor teeth = odd number.

number of stator teeth - number of rotor teeth = 0.

number of stator teeth - number of rotor teeth = even number.

number of stator teeth - number of rotor teeth = negative number.

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

16.

8.

4.

32.

16.

8.

4.

32.

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Electrical Machines

Electrical Machines For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

Electrical Machines The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

Electrical Machines The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

Electrical Machines Cogging in induction motor occurs when

Electrical Machines A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

Electrical Machines
Cogging in induction motor occurs when

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is