3
1-17. What type of dc generator application
best utilizes the features of the lap-
wound armature?
1. High-voltage
2. High-current
3. High-speed
4. Variable-speed
1-18. Which of the following is NOT a major
classification of dc generators?
1. Compound-wound
2. Series-wound
3. Shunt-wound
4. Lap-wound
1-19. What characteristic of series-wound
generators makes them unsuitable for
most applications?
1. They require external field excitation
2. The output voltage varies as the
speed varies
3. They are not capable of supplying
heavy loads
4. The output voltage varies as the load
current varies
1-20. As the load current of a dc generator
varies from no-load to full-load, the
variation in output voltage is expressed
as a percent of the full-load voltage.
What term applies to this expression?
1. Gain
2. Voltage control
3. Voltage regulation
4. Load limit
1-21. When two or more generators are used to
supply a common load, what term is
applied to this method of operation?
1. Series
2. Compound
3. Split-load
4. Parallel
1-22. What special-purpose dc generator is
used as a high-gain power amplifier?
1. Lap-wound
2. Shunt-wound
3. Amplidyne
4. Compound-connected
1-23. The gain of an amplifying device can be
determined by which of the following
formulas?
1. GAIN = INPUT + OUTPUT
2. GAIN = INPUT OUTPUT
3. GAIN = OUTPUT - INPUT
4. GAIN = OUTPUT + INPUT
1-24. The maximum gain possible from an
amplidyne is approximately
1. 100
2. 5,000
3.
10,000
4.
50,000
1-25. What determines the direction of rotation
of a dc motor?
1. The type of armature
2. The method of excitation
3. The number of armature coils
4. The polarity of armature current and
direction of magnetic flux
1-26. When you use the right-hand rule for
motors, what quantity is indicated by the
extended forefinger?
1. Direction of flux north to south
2. Direction of flux south to north
3. Direction of current
4. Direction of motion
