1. Where are the output windings on an AC generator?
a. Stator
b. Rotor with commutator<...
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1. Where are the output windings on an AC generator?
a. Stator
b. Rotor with commutator
c. Rotor with slip rings
d. None of the above
2. A generator rated for 30 KVA and power factor 0.8 has a maximum power output of:
a. 30 KW
b. 24 KW
c. 48 KW
d. None of the above
3. The voltage of an AC generator:
a. Rises to max in one direction and remains constant
b. Rises to max in one direction, falls to zero and rises in the same direction
c. Rises to max in one direction then fall to zero then rises to max in the opposite direction
d. None of the above
4. Power factor of a generator is:
a. Tan Ó¨
b. Cos Ó¨
c. Sin Ó¨
d. None
5. A generator supplied 150 V AC phase and load is 10 Ohms per phase. What is the phase current?
a. 25.5 A
b. 15 A
c. 1.5 A
d. None of the above
6. An AC generator’s frequency will:
a. Be proportional to the RPM at which it is driven
b. Always be constant regardless of the generators drive speed
c. Vary with changes in field strength.
d. None of the above
7. The sum of the instantaneous EMF’s in a three phase system is:
a. Three times the phase voltage
b. Zero
c. Equal to the line voltage
d. None of the above
8. The line voltage from a generator with a delta type connection will be:
a. Lower than the phase voltage
b. The same as the phase voltage
c. Higher than the phase voltage
d. None of the above
9. Permanent magnets in an AC generator are:
a. To provide initial excitation
b. To rectify the current
c. To control the frequency
d. None of the above
10. In delta-connected generator:
a. Line voltage = root 3 ties phase voltage, line current = phase current
b. Line voltage = phase voltage, line current = root 3 times phase current
c. Line voltage = phase voltage, line current =phase current divided by root 3
d. None of the above
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