7- Iron loss in the rotor of a 3-phase induction motor (a) Very low frequency of emf induced in the rotor (c) Very low flux density in rotor parts 8- The starting current of a 3-phase induction motor is negligible due to (b) Very low emf induced in the rotor (d) Constant magnitude of flux linking the rotor core is about-of its full load rated current
7- Iron loss in the rotor of a 3-phase induction motor (a) Very low frequency of emf induced in the rotor (c) Very low flux density in rotor parts 8- The starting current of a 3-phase induction motor is negligible due to (b) Very low emf induced in the rotor (d) Constant magnitude of flux linking the rotor core is about-of its full load rated current
Chapter39: Synchronous Motor Operation
Section: Chapter Questions
Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...
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![7- Iron loss in the rotor of a 3-phase induction motor is negligible due to
(a) Very low frequency of emf induced in the rotor
(c) Very low flux density in rotor parts
8- The starting current of a 3-phase induction motor is about
(a) Half
(c) 5 to 7 times
(b) Twice
(d) 8 to 10 times
9- During plugging of an induction motor
(a) Phase sequence is reversed
(b) A de source is connected to stator
(e) One phase is open circaited
(d) Power is ied back to mains
10- Direct online (D.O.L.) starter is used for induction motors
(a)Less than 5 h.p. (b) Less than 10 h.p. (c) Greater than 10 h.p. (d) For any capacity
(b) Very low emf induced in the rotor
(d) Constant magnitude of flux linking the rotor core
of its full load rated current](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F185ab4bf-238c-417a-9e07-513a36b101eb%2F59214112-08c6-4015-a83e-5141c7ba701a%2Fe4aa2ep_processed.jpeg&w=3840&q=75)
Transcribed Image Text:7- Iron loss in the rotor of a 3-phase induction motor is negligible due to
(a) Very low frequency of emf induced in the rotor
(c) Very low flux density in rotor parts
8- The starting current of a 3-phase induction motor is about
(a) Half
(c) 5 to 7 times
(b) Twice
(d) 8 to 10 times
9- During plugging of an induction motor
(a) Phase sequence is reversed
(b) A de source is connected to stator
(e) One phase is open circaited
(d) Power is ied back to mains
10- Direct online (D.O.L.) starter is used for induction motors
(a)Less than 5 h.p. (b) Less than 10 h.p. (c) Greater than 10 h.p. (d) For any capacity
(b) Very low emf induced in the rotor
(d) Constant magnitude of flux linking the rotor core
of its full load rated current
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