NEIEP 400 Final review EXAM
QUESTIONS AND ANSWERS 2023
VERIFIED AND ALREADY PASSED
What material should be used for seating brushes? - CORRECT ANS Sandpaper Readings on the meter appear to be inaccurate, what should you do? - CORRECT ANS Test meter A machine that converts mechanical energy into electrical energy - CORRECT ANS Generator What is the purpose of interpoles in a motor? - CORRECT ANS Helps prevent neutral planes from shifting In the basic loop circuit generator armature supplies DC power to what DC elevator hoist motor component? - CORRECT ANS Motor Armature If you have leakage resistance to ground, what will you use to test? - CORRECT ANS Megger What kind of device would you use to measure current without disconnecting wiring?
- CORRECT ANS Clamp on ammeter
What is the synchronous speed of 3 phase, 60 Hz, 6 pole motor? - CORRECT
ANS 1200 RPM
Before attempting to measure resistance in an unknown resistor in a circuit, what must be done? - CORRECT ANS Isolate from one side What is the method used to resolve residual magnetism to an exitor? - CORRECT ANS Flashing the field What is the inherent current limiter present for a rotating motor armature called? -
CORRECT ANS CEMF
In order to protect internal circuits, how is the 10 amp input jack on a digital multimeter usually protected? - CORRECT ANS Fused What is the field protective relay in series with? - CORRECT ANS Motor shunt field What material is used as insulation between the commutator and the armature shaft? - CORRECT ANS Mica What elements make up commutator film? - CORRECT ANS Copper oxide film, graphite film, free graphite particles and waters vapor components What does it mean when saturation occurs? - CORRECT 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? - CORRECT ANS Ohmmeter When should lubrication of motor bearings be done? - CORRECT ANS Not running What would be the result if a meter set to current and connected to a voltage source? - CORRECT ANS Blow fuse When commutation is good, what color is the commutator? - CORRECT ANS Chocolate What is a precision shunt used for measuring? - CORRECT ANS Current On a reversible D.C. door operator motor, what angle is the brush mounted? - CORRECT ANS Radially, straight up and down
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