NEIEP 400 Final review 80 Questions with Complete Solutions What material should be used for seating brushes? - Correct Answer Sandpaper Readings on the meter appear to be inaccurate, what should you do? - Correct Answer Test meter A machine that converts mechanical energy into electrical energy - Correct Answer Generator What is the purpose of interpoles in a motor? - Correct Answer Helps prevent neutral planes from shifting In the basic loop circuit generator armature supplies DC power to what DC elevator hoist motor component? - Correct Answer Motor Armature If you have leakage resistance to ground, what will you use to test? - Correct Answer Megger What kind of device would you use to measure current without disconnecting wiring? - Correct Answer Clamp on ammeter What is the synchronous speed of 3 phase, 60 Hz, 6 pole motor? - Correct Answer
1200 RPM
Before attempting to measure resistance in an unknown resistor in a circuit, what must be done? - Correct Answer Isolate from one side What is the method used to resolve residual magnetism to an exitor? - Correct Answer Flashing the field What is the inherent current limiter present for a rotating motor armature called? - Correct Answer CEMF In order to protect internal circuits, how is the 10 amp input jack on a digital multimeter usually protected? - Correct Answer Fused What is the field protective relay in series with? - Correct Answer Motor shunt field What material is used as insulation between the commutator and the armature shaft? - Correct Answer Mica What elements make up commutator film? - Correct Answer Copper oxide film, graphite film, free graphite particles and waters vapor components 1 / 2
What does it mean when saturation occurs? - Correct Answer 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 Answer Ohmmeter When should lubrication of motor bearings be done? - Correct Answer Not running What would be the result if a meter set to current and connected to a voltage source? - Correct Answer Blow fuse When commutation is good, what color is the commutator? - Correct Answer Chocolate What is a precision shunt used for measuring? - Correct Answer Current On a reversible D.C. door operator motor, what angle is the brush mounted? - Correct Answer Radially, straight up and down What is the significance of the meter specification of ohms per volt? - Correct Answer Internal resistance at specific voltage On the resistance scale of a digital meter, what does the lazy 8 symbol signify? - Correct Answer Infinity When some of the generator output is used to supply the field current how is the generator described? - Correct Answer Self-exciting When the multimeter is set to amps position the test leads are considered to be in what state? - Correct Answer Short circuit What should resistance of an armature be when measured from commutator to ground with brushes removed? - Correct Answer High resistance What method of armature winding is used for high current applications? - Correct Answer lap winding What should always be done to protect the meter from damage when measuring unknown voltage? - Correct Answer Set to the highest range To what scale should the ammeter be set in order to read a current of 2000 ma? - Correct Answer 10 amp What must be done when testing a resistance to avoid readings caused by parallel circuit paths? - Correct Answer Remove one or two of the wire to the item being tested
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