Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

B is bigger than A for the same current rating

A is bigger than B for the same voltage rating

both are of the same size for the same current rating

A is bigger than B for the same current rating

B is bigger than A for the same current rating

A is bigger than B for the same voltage rating

both are of the same size for the same current rating

A is bigger than B for the same current rating

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Electrical Machines
Lamination of core are generally made of

silicon steel.

stainless steel.

cast iron.

carbon.

silicon steel.

stainless steel.

cast iron.

carbon.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

less and maximum torque increases

less and maximum torque decreases

more and maximum torque remains constant

more and maximum torque decreases

less and maximum torque increases

less and maximum torque decreases

more and maximum torque remains constant

more and maximum torque decreases

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

Kef2KfBm2.

Kef2Kf2Bm2.

KefKf2Bm2.

Kef2Kf2Bm.

Kef2KfBm2.

Kef2Kf2Bm2.

KefKf2Bm2.

Kef2Kf2Bm.

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Electrical Machines
In a transformer which of the following losses are zero?

Iron loss

Copper loss

Rotational loss

All of these

Iron loss

Copper loss

Rotational loss

All of these

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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

2, 3, 4, 5

1, 3, 4, 5

1, 2, 3, 4 and 5

2, 3, 4

2, 3, 4, 5

1, 3, 4, 5

1, 2, 3, 4 and 5

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Electrical Machines

Electrical Machines Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

Electrical Machines Lamination of core are generally made of

Electrical Machines In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

Electrical Machines If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

Electrical Machines In a transformer which of the following losses are zero?

Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

Electrical Machines
Lamination of core are generally made of

Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

Electrical Machines
In a transformer which of the following losses are zero?