NEIEP 400 Final Exam Study Guide Questions And Answers Verified 100% Correct

NEIEP 400 Final Exam Study Guide Questions And Answers Verified 100% Correct Holds all the magnetic lines of flux that it can hold - ANSWER What does it mean when saturation occurs? Ohmmeter - ANSWER What kind of meter would you use to detect a ground in the armature coils? Not running - ANSWER When should lubrication of motor bearings be done? Blow fuse - ANSWER What would be the result if a meter set to current and connected to a voltage source? Chocolate - ANSWER When commutation is good, what color is the commutator? Current - ANSWER What is a precision shunt used for measuring? Radially, straight up and down - ANSWER On a reversible D.C. door operator motor, what angle is the brush mounted? Internal resistance of the meter at specific voltage range - ANSWER What is the significance of the meter specification of ohms per volt? Infinity - ANSWER On the resistance scale of a digital meter, what does the lazy 8 symbol signify? Self-exciting - ANSWER When some of the generator output is used to supply the field current how is the generator described? short circuit - ANSWER When the multimeter is set to amps position the test leads are considered to be in what state? high resistance - ANSWER What should resistance of an armature be when measured from commutator to ground with brushes removed? Lap winding - ANSWER What method of armature winding is used for high current applications? Set to the highest range - ANSWER What should always be done to protect the meter from damage when measuring unknown voltage? Sandpaper - ANSWER What material should be used for seating brushes? Test meter - ANSWER Readings on the meter appear to be inaccurate, what should you do? Generator - ANSWER A machine that converts mechanical energy into electrical energy Help prevent neutral plains from shifting - ANSWER What is the purpose of interpoles in a motor? Motor armature - ANSWER In the basic loop circuit generator armature supplies DC power to what DC elevator hoist motor component? Megger - ANSWER If you have leakage resistance to ground, what will you use to test? Clamp on ammeter - ANSWER What kind of device would you use to measure current without disconnecting wiring? 1200 rpm - ANSWER What is the synchronous speed of 3 phase, 60 Hz, 6 pole motor? isolate from one side - ANSWER Before attempting to measure resistance in an unknown resistor in a circuit, what must be done? Flashing the field - ANSWER What is the method used to resolve residual magnetism to an exitor? CEMF - ANSWER What is the inherent current limiter present for a rotating motor armature called? Fused - ANSWER In order to protect internal circuits, how is the 10 amp input jack on a digital multimeter usually protected? Motor shunt field - ANSWER What is the field protective relay in series with? Mica - ANSWER What material is used as insulation between the commutator and the armature shaft? Copper oxide film, graphite film, free graphite particles and waters vapor components - ANSWER What elements make up a proper commutator film?