4Th Class Power Engineering Chapter 81

Front 1

The field rheostat in a DC generator is used to adjust the _____ of the unit.

1) Torque

2) Current

3) Direction of rotation

4) Output voltage

5) Slip

Back 1

Output voltage

Front 2

Alternators are constructed to use slip rings made of brass or:

1) Copper

2) Mica

3) Steel

4) Carbon

5) Silicon

Back 2

Steel

Front 3

A 6 pole alternator producing 60 Hz power must turn at:

1) 600 rpm

2) 1 200 rpm

3) 2 400 rpm

4) 1 800 rpm

5) 1 000 rpm

Back 3

1 200 rpm

Front 4

A compound wound DC generator may have three characteristics which are a:

1. Decreasing output voltage verses load

2. No amperage requirement

3. Constant output voltage

4. Supplementary AC requirement

5. Rising output voltage versus load

1) 1, 2, 4

2) 2, 3, 5

3) 2, 3, 4

4) 1, 3, 5

5) 1, 4, 5

Back 4

4) 1, 3, 5

Front 5

A rheostat is also known as a:

1) Flux field regulator

2) Resistance regulator

3) Variable resistor

4) Current controller

5) Voltage regulator

Back 5

Variable resistor