NEIEP 400 FINAL REVIEW (ALL
ANSWERED)
Question :What material should be used for seating
brushes?
Correct answer:Sandpaper
Question :Readings on the meter appear to be inaccurate,
what should you do?
Correct answer:Test meter
Question :A machine that converts mechanical energy
into electrical energy
Correct answer:Generator
Question :What is the purpose of interpoles in a motor?
Correct answer:Helps prevent neutral planes from
shifting
Question :In the basic loop circuit generator armature
supplies DC power to what DC elevator hoist motor component?
Correct answer:Motor Armature
Question :If you have leakage resistance to ground, what
will you use to test?
Correct answer:Megger
Question :What kind of device would you use to
measure current without disconnecting wiring?
Correct answer:Clamp on ammeter
Question :What is the synchronous speed of 3 phase, 60
Hz, 6 pole motor?
Correct answer:1200 RPM
Question :Before attempting to measure resistance in an
unknown resistor in a circuit, what must be done?
Correct answer:Isolate from one side
Question :What is the method used to resolve residual
magnetism to an exitor?
Correct answer:Flashing the field
Question :What is the inherent current limiter present for
a rotating motor armature called?
Correct answer:CEMF
Question :In order to protect internal circuits, how is the
10 amp input jack on a digital multimeter usually protected?
Correct answer:Fused
Question :What is the field protective relay in series
with?
Correct answer:Motor shunt field
Question :What material is used as insulation between
the commutator and the armature shaft?
Correct answer:Mica
Question :What elements make up commutator film?
Correct answer:Copper oxide film, graphite film, free
graphite particles and waters vapor components
Question :What does it mean when saturation occurs?
Correct answer:Holds all the magnetic lines of flux it can
hold
Question :What kind of meter would you use to detect a
ground in the armature coils?
Correct answer:Ohmmeter
Question :When should lubrication of motor bearings be
done?
Correct answer:Not running
Question :What would be the result if a meter set to
current and connected to a voltage source?
Correct answer:Blow fuse
Question :When commutation is good, what color is the
commutator?
Correct answer:Chocolate
Question :What is a precision shunt used for measuring?
Correct answer:Current
Question :On a reversible D.C. door operator motor,
what angle is the brush mounted?
Correct answer:Radially, straight up and down
Question :What is the significance of the meter
specification of ohms per volt?
Correct answer:Internal resistance at specific voltage
Question :On the resistance scale of a digital meter, what
does the lazy 8 symbol signify?
Correct answer:Infinity
Question :When some of the generator output is used to
supply the field current how is the generator described?
