DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Heavy sparking at brushes.

Both of above.

Heavy sparking at the first stud of starting resistance steps.

None of these.

Heavy sparking at brushes.

Both of above.

Heavy sparking at the first stud of starting resistance steps.

None of these.

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Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then

None of these

the machine will share load equally.

the machine with more drooping characteristic will supply more load.

the machine with more drooping characteristic will supply less load.

None of these

the machine will share load equally.

the machine with more drooping characteristic will supply more load.

the machine with more drooping characteristic will supply less load.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

both 1 and 2

windage and friction loss

Copper loss

core loss only

both 1 and 2

windage and friction loss

Copper loss

core loss only

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Electrical Machines
The output power of a dc motor is given by

EbIa2.

EbIa.

EIa.

none of these.

EbIa2.

EbIa.

EIa.

none of these.

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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, 3, 6

1, 2, 5

3, 4, 5

2, 4, 5, 6

2, 3, 6

1, 2, 5

3, 4, 5

2, 4, 5, 6

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Electrical Machines
Dummy coils are used for

All of these

increasing efficiency.

mechanical balancing.

reducing armature reaction.

All of these

increasing efficiency.

mechanical balancing.

reducing armature reaction.

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Electrical Machines

Electrical Machines DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then

Electrical Machines What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

Electrical Machines The output power of a dc motor is given by

Electrical Machines Dummy coils are used for

Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then

Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

Electrical Machines
The output power of a dc motor is given by

Electrical Machines
Dummy coils are used for