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1. What material should be used for seating brushes? - answers>Sandpaper
2. Readings on the meter appear to be inaccurate, what should you do? -
answers>Test meter
3. A machine that converts mechanical energy into electrical energy -
answers>Generator
4. What is the purpose of interpoles in a motor? - answers>Helps prevent neutral
planes from shifting
5. In the basic loop circuit generator armature supplies DC power to what DC
elevator hoist motor component? - answers>Motor Armature
6. If you have leakage resistance to ground, what will you use to test? -
answers>Megger
7. What kind of device would you use to measure current without disconnecting
wiring? - answers>Clamp on ammeter
8. What is the synchronous speed of 3 phase, 60 Hz, 6 pole motor? - answers>1200
RPM
9. Before attempting to measure resistance in an unknown resistor in a circuit, what
must be done? - answers>Isolate from one side
10.What is the method used to resolve residual magnetism to an exitor? -
answers>Flashing the field
11.What is the inherent current limiter present for a rotating motor armature called? -
answers>CEMF
12.In order to protect internal circuits, how is the 10 amp input jack on a digital
multimeter usually protected? - answers>Fused
13.What is the field protective relay in series with? - answers>Motor shunt field
14.What material is used as insulation between the commutator and the armature
shaft? - answers>Mica
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15.What elements make up commutator film? - answers>Copper oxide film, graphite
film, free graphite particles and waters vapor components
16.What does it mean when saturation occurs? - answers>Holds all the magnetic
lines of flux it can hold
17.What kind of meter would you use to detect a ground in the armature coils? -
answers>Ohmmeter
18.When should lubrication of motor bearings be done? - answers>Not running
19.What would be the result if a meter set to current and connected to a voltage
source? - answers>Blow fuse
20.When commutation is good, what color is the commutator? - answers>Chocolate
21.What is a precision shunt used for measuring? - answers>Current
22.On a reversible D.C. door operator motor, what angle is the brush mounted? -
answers>Radially, straight up and down
23.What is the significance of the meter specification of ohms per volt? -
answers>Internal resistance at specific voltage
24.On the resistance scale of a digital meter, what does the lazy 8 symbol signify? -
answers>Infinity
25.When some of the generator output is used to supply the field current how is the
generator described? - answers>Self-exciting
26.When the multimeter is set to amps position the test leads are considered to be in
what state? - answers>Short circuit
27.What should resistance of an armature be when measured from commutator to
ground with brushes removed? - answers>High resistance
28.What method of armature winding is used for high current applications? -
answers>lap winding
29.What should always be done to protect the meter from damage when measuring
unknown voltage? - answers>Set to the highest range
30.To what scale should the ammeter be set in order to read a current of 2000 ma? -
answers>10 amp
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