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ASSIGNMENT 1
Textbook assignment: “Introduction to Generators and Motors,” pages 1-1 through 4-18.
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1-1. In generators, what principle is used to
convert mechanical motion to electrical
energy?
1. Atomic reaction
2. Electrical attraction
3. Magnetic repulsion
4. Magnetic induction
1-2. When you use the left-hand rule for
generators, what is indicated by the
middle finger?
1. Direction of flux
2. Direction of motion
3. Direction of current flow
4. Direction of the magnetic field
1-3. The output voltage of an elementary
generator is coupled from the armature to
the brushes by what devices?
1. Slip rings
2. Interpoles
3. Terminals
4. Pigtails
1-4. An elementary generator consists of a
single coil rotating in a magnetic field.
Why is NO voltage induced in the coil as
it passes through the neutral plane?
1. Flux lines are too dense
2. Flux lines are not being cut
3. Flux lines are not present
4. Flux lines are being cut in the wrong
direction
1-5. What components cause(s) a generator to
produce a dc voltage instead of an ac
voltage at its output?
1. The brushes
2. The armature
3. The slip rings
4. The commutator
1-6. When two adjacent segments of the
commutator on a single-loop dc
generator come in contact with the brush
at the same time, which of the following
conditions will occur?
1. The output voltage will be zero
2. The output voltage will be maximum
negative
3. The output voltage will be maximum
positive
1-7. In an elementary, single-coil, dc
generator with one pair of poles, what is
the maximum number of pulsations
produced in one revolution?
1. One
2. Two
3. Three
4. Four
1-8. If an elementary dc generator has a two-
coil armature and four field poles, what
is the total number of segments required
in the commutator?
1. 8
2. 2
3.
16
4. 4
