NEIEP 400 Final review Exam Questions and Answers 2024 Correctly done

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