In D.C. generators the polarity of the interpoles

Polarity of interpoles is one pole ahead in the direction of armature rotation in _____________

A

Motor

B

Generator

C

Always ahead

D

Always behind

Two generators are running in parallel. One of the generators may run as motor for which of the following reasons?

A

The direction of that generator is reversed

B

The speed of that generator is increased

C

The field of that generator is weakened

D

That generator takes large share of loads

Commercially, which of the following generators is called turbo-alternators or turbo-generators?

A

salient pole rotor synchronous generators

B

cylindrical pole rotor induction generators

C

salient pole rotor induction generators

D

cylindrical rotor synchronous generators

A manufacturing firm maintains one product assembly line to produce signal generators. Weekly demand for the generators is 35 units. The line operates for 7 hours per day, 5 days per week. What is the maximum production time per unit in hours required of the line to meet the demand?

A

1.0 hour per unit

B

1.2 hours per unit

C

1.4 hours per unit

D

1.6 hours per unit

Why are tapered interpoles used in large DC electric machines?

A

To eliminate saturation at root of pole

B

To obtain higher speeds

C

To obtain maximum torque

D

To eliminate eddy current loss

What are the different types of interpoles in DC electric machines?

A

Parallel sided and Tapered

B

Open and closed

C

Single layer and double layer

D

Armature and field

Each of the following is valid for interpoles except __________

A

they are connected in parallel with the armature so that they carry part of armature current

B

they are small yoke fixed poles spaced in between main poles

C

their polarity, in case of generator is same as that of main poles ahead

D

they automatically neutralize not only reactance voltage but cross-magnetization also

Interpoles are used to start the dc motor above the base speed.

A

True

B

False

Interpoles provide mmf more than armature mmf in a dc machine.

A

True

B

False

Each of the following statements regarding interpoles is true except______________________

A

They are small yoke-fixed poles spaced in between the main poles

B

They are connected in parallel with the armature so that they carry part of the armature current

C

Their polarity, in the case of generators is the same as that of the main pole ahead

D

They automatically neutralize not only reactance voltage but cross-magnetisation as well

In D.C. generators the polarity of the interpoles

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