True or False (1)A three-speed motor may be classified as a variable speed (2)A

Question

True or False
(1)A three-speed motor may be classified as a variable speed (2)A motor's locked rotor current is usually less than its running current (3)An ihp motor is usually more efficient than an sfhp motor (4)A motor with a 213-T frame size is likely to have a higher hp rating than a motor with a 145-T frame (5)An inductor motor does not have a commutator or brushes (6)In a split-phase motor, a start switch disconnects the start winding after the motor has reached about 70% to 80% of its operating speed (7)Salient rotor poles used in an induction motor allow it to operate at synchronous speed (8)A component dc motor has better speed regulation than a shunt motor True or False
(1)A three-speed motor may be classified as a variable speed (2)A motor's locked rotor current is usually less than its running current (3)An ihp motor is usually more efficient than an sfhp motor (4)A motor with a 213-T frame size is likely to have a higher hp rating than a motor with a 145-T frame (5)An inductor motor does not have a commutator or brushes (6)In a split-phase motor, a start switch disconnects the start winding after the motor has reached about 70% to 80% of its operating speed (7)Salient rotor poles used in an induction motor allow it to operate at synchronous speed (8)A component dc motor has better speed regulation than a shunt motor
(1)A three-speed motor may be classified as a variable speed (2)A motor's locked rotor current is usually less than its running current (3)An ihp motor is usually more efficient than an sfhp motor (4)A motor with a 213-T frame size is likely to have a higher hp rating than a motor with a 145-T frame (5)An inductor motor does not have a commutator or brushes (6)In a split-phase motor, a start switch disconnects the start winding after the motor has reached about 70% to 80% of its operating speed (7)Salient rotor poles used in an induction motor allow it to operate at synchronous speed (8)A component dc motor has better speed regulation than a shunt motor

Explanation / Answer

1.Flase

2.Flase,it vey high 5 to 8 imes

3.True

4.True

5.True,because induction motor is single excited macine

6.True

7.Flase,in induction motor only 2 types of rotors are used 1.slipring,2.squrrel cage

8.True

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