DC_AC Drives Test 2 Questions and Answers 2024

DC_AC Drives Test 2 Questions and Answers 2024

1. Motors operate on the principle that when a - carrying conductor is placed in a magnetic field, a force that tends to move the conductor out of the field is exerted on the conductor.: Current 2. A spring placed behind the brush forces the brush to make contact with the .: Commutator 3. What two components are common failures in a DC motor?: Brushes and commutators 4. What is the rotating force of a motor shaft called?: Torque 5. What are the stationary windings of a DC motor called?: Field windings/stator 6. What are the rotating windings of a DC motor called?: Armature/rotor 7. T/F: A DC series motor is a DC motor that has the series field windings connected with the commutator.: False (Connected to the armature, not the commutator) 8. T/F:The horsepower that is produced by a motor depends on the strength of the magnetic field in the motor.: False (Torque, not horsepower) 9. T/F: A DC series motor should always be connected directly to the load and not through belts, chains, etc.: True 10. What are labels of the four wires coming out of a DC series motor?: A1, A2, S1, S2 11. What are labels of the four wires coming out of a DC shunt motor?: A1, A2, F1, F2 12. To help reduce damage to switch contacts, a(n) circuit is used to protect the switch.: Snubber 13. A(n) is a sensor transducer that produces discrete electrical pulses during each increment of shaft rotation.: Encoder 14. What is the unit of measure used for electrical power?: Watt 15. Horsepower is a unit equal to?: 746 Watts or 33000 ft. lb. 16. Identify the wiring configurations.: Left: WYE Right: Delta 17. With a DMM set to check continuity on a DC series motor, what does it mean if the DMM beeps when you connect the leads to the frame of the motor and A1? (Good, open, short, ground): Ground 18. With a DMM set to check continuity on a DC series motor, what does it mean if the DMM beeps when you connect the leads to A1 and A2? (Good, open, short, ground): Good 19. With a DMM set to check continuity on a DC series motor, what does it mean if the DMM doesn't beep when you connect the leads to A1 and A2? (Good, open, short, ground): Open 20. With a DMM set to check continuity on a DC series motor, what does it mean if the DMM beeps when you connect the leads to A1 and S2? (Good, open, short, ground): Short 21. What component is usually the first thing to fail on a DC motor?: Brushes 22. What component is usually the second thing to fail on a DC motor?: Com- mutator