NEIEP 400 Final Review: Questions &
Answers
What material should be used for seating brushes?(Ans- Sandpaper
Readings on the meter appear to be inaccurate, what should you do?(Ans- Test meter
A machine that converts mechanical energy into electrical energy (Ans- Generator
What is the purpose of interpoles in a motor?(Ans- Helps prevent neutral planes from shifting
In the basic loop circuit generator armature supplies DC power to what DC elevator hoist motor component?(Ans- Motor Armature
If you have leakage resistance to ground, what will you use to test?(Ans- Megger
What kind of device would you use to measure current without disconnecting wiring?(Ans- Clamp on ammeter
What is the synchronous speed of 3 phase, 60 Hz, 6 pole motor?(Ans- 1200 RPM
Before attempting to measure resistance in an unknown resistor in a circuit, what must be done?(Ans- Isolate from one side
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What is the method used to resolve residual magnetism to an exitor?(Ans- Flashing the field
What is the inherent current limiter present for a rotating motor armature called? (Ans- CEMF
In order to protect internal circuits, how is the 10 amp input jack on a digital multimeter usually protected?(Ans- Fused
What is the field protective relay in series with?(Ans- Motor shunt field
What material is used as insulation between the commutator and the armature shaft?(Ans- Mica
What elements make up commutator film?(Ans- Copper oxide film, graphite film, free graphite particles and waters vapor components
What does it mean when saturation occurs?(Ans- Holds all the magnetic lines of flux it can hold
What kind of meter would you use to detect a ground in the armature coils?(Ans- Ohmmeter
When should lubrication of motor bearings be done?(Ans- Not running
What would be the result if a meter set to current and connected to a voltage source?(Ans- Blow fuse
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