Circle T if the statement is true, F if it is false. 19. TF A three-speed motor

Question

Circle T if the statement is true, F if it is false. 19. TF A three-speed motor may be classified as variable speed. 20. T F A motor's locked rotor current is usually less than its running current. F An ihp motor is usually more efficient than an sfhp motor. 21. T higher hp rating than a motor with A motor with a 213-T frame size is likely to have a a 145-T frame. 22. T F 23. T F An induction motor does not have a commutator or brushes. 24. T F In a split-phase motor, a start switch disconnects the start winding after the motor has 25. T F Salient rotor poles used in an induction motor allow it to operate at synchronous 26. T F A compound de motor has better speed regulation than a shunt motor 27. T F A universal motor has very good speed regulation. reached about 70% to 80% of its operating speed. speed 28. T F A rectifier converts ac to smooth dc.

Explanation / Answer

19. True, A three-speed motor can be classified as variable speed motor because it can run on several speeds.

20. False, locked rotor current is very high. i.e 4-5 times of rated current.

21. True, an ihp motor is usually more efficient than sfhp motor.

22. True, a motor with a 213-T frame size is likely to have higher hp rating than a motor with a 145-T frame.

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