The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

2, 4, 5, 6

2, 3, 6

1, 2, 5

3, 4, 5

2, 4, 5, 6

2, 3, 6

1, 2, 5

3, 4, 5

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

4.8% and -3.2%

None of these

6% and -4%

3.2% and -1.6%

4.8% and -3.2%

None of these

6% and -4%

3.2% and -1.6%

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

both of above.

AC.

DC.

None of these

both of above.

AC.

DC.

None of these

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Electrical Machines
Which machine is used for battery charging?

DC shunt generator.

DC series generator.

Compounded DC generator.

None of these.

DC shunt generator.

DC series generator.

Compounded DC generator.

None of these.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

less than 1 %.

1.5 %.

zero.

4 %.

less than 1 %.

1.5 %.

zero.

4 %.

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Electrical Machines
During no load test, an induction motor draws power

for core loss and windage and friction loss.

for core loss and copper loss.

for copper loss and windage friction loss.

only for the small copper loss.

for core loss and windage and friction loss.

for core loss and copper loss.

for copper loss and windage friction loss.

only for the small copper loss.

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Electrical Machines

Electrical Machines A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

Electrical Machines The emf induced in a conductor rotating in a bipolar field is

Electrical Machines Which machine is used for battery charging?

Electrical Machines In an induction motor, the no-load slip is generally equal to

Electrical Machines During no load test, an induction motor draws power

Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

Electrical Machines
Which machine is used for battery charging?

Electrical Machines
In an induction motor, the no-load slip is generally equal to

Electrical Machines
During no load test, an induction motor draws power