Homework SourseTrue or False 1A threespeed motor may be classified as a var
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
Solution
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
