I need to choose the correct points with a visual explanation and description if possible. Choose the correct answer: 1- The stator core of a 3- phase induction motor is laminated in order to reduce the Eddy current loss ) Weight of the stator (B) Hysteresis loss (C) Both eddy current and hysteresis loss - In cumulatively cascade method for speed controlling of a 3-phase induction motor, if PA is the number of poles of main motor and P, is the number of poles of auxiliary motor. Then the speed of the motor B is given by Ⓐ120f/ PA + PB CO (B) 120f/PA-Ps (C) 120f/PA (D) 120f/ Ps 3-Direct online starter is used for 3- phase induction motors having capacity COOOO ⑭Ⓐ Less than 5 h.p. (B) Less than 10 h.p. (C) Greater than 10 h.p. (D) For any capacity motor 4-Crawling of a 3- phase induction motor is a phenomena mainly associated with (B) 5th harmonics Ⓒ) 7 th harmonics (D) 2nd harmonics (A) 3rd harmonics 5-Cogging in a 3- phase induction motor is caused --------- (Ⓐ) If the number of stator slots are equal to number of rotor slots (B) If the motor is running at fraction of its rated speed (C) Due to fifth harmonics (D) All of these 6- The plot of power factor against the field current of synchronous motor is known as--.... (A) V-curves B Inverted V-curves (C) Both (A) and (B) (D) None of these 7-Synchronous motor works on the principle of ----- (A) Mutual induction (B) Electromagnetic induction ⑤ Magnetic locking (D) None of these 8- The direct axis reactance (✗d) and quadrature axis reactance (X) obtained from slip test are-- (A) X = minimum voltage/minimum current, X₁ = maximum voltage/maximum current (B) X=minimum voltage/maximum current, X₁ = maximum voltage/maximum current = maximum voltage/minimum current, X₁ = minimum voltage/maximum current (D) X = maximum voltage/maximum current, X₁ = minimum voltage/minimum current 9- What does the pointer of synchroscope indicate when it is rotating in anticlockwise direction and when It is rotating in clockwise direction? Incoming machine is running slow, incoming machine is running faster (B) Incoming machine is running faster, incoming machine is running slow (C) Pointer rotates only in clockwise direction (D) all of the above 10- In Potier's triangle method, to determine armature leakage reactance and armature reaction mmf separately, the tests performed are----- (A) Open circuit test and short circuit test (B) Open circuit test and zero power factor test (C) Short circuit test and zero power factor test (D) Open circuit test, short circuit test and zero power factor test

I need to choose the correct points with a visual explanation and description if possible. Choose the correct answer: 1- The stator core of a 3- phase induction motor is laminated in order to reduce the Eddy current loss ) Weight of the stator (B) Hysteresis loss (C) Both eddy current and hysteresis loss - In cumulatively cascade method for speed controlling of a 3-phase induction motor, if PA is the number of poles of main motor and P, is the number of poles of auxiliary motor. Then the speed of the motor B is given by Ⓐ120f/ PA + PB CO (B) 120f/PA-Ps (C) 120f/PA (D) 120f/ Ps 3-Direct online starter is used for 3- phase induction motors having capacity COOOO ⑭Ⓐ Less than 5 h.p. (B) Less than 10 h.p. (C) Greater than 10 h.p. (D) For any capacity motor 4-Crawling of a 3- phase induction motor is a phenomena mainly associated with (B) 5th harmonics Ⓒ) 7 th harmonics (D) 2nd harmonics (A) 3rd harmonics 5-Cogging in a 3- phase induction motor is caused --------- (Ⓐ) If the number of stator slots are equal to number of rotor slots (B) If the motor is running at fraction of its rated speed (C) Due to fifth harmonics (D) All of these 6- The plot of power factor against the field current of synchronous motor is known as--.... (A) V-curves B Inverted V-curves (C) Both (A) and (B) (D) None of these 7-Synchronous motor works on the principle of ----- (A) Mutual induction (B) Electromagnetic induction ⑤ Magnetic locking (D) None of these 8- The direct axis reactance (✗d) and quadrature axis reactance (X) obtained from slip test are-- (A) X = minimum voltage/minimum current, X₁ = maximum voltage/maximum current (B) X=minimum voltage/maximum current, X₁ = maximum voltage/maximum current = maximum voltage/minimum current, X₁ = minimum voltage/maximum current (D) X = maximum voltage/maximum current, X₁ = minimum voltage/minimum current 9- What does the pointer of synchroscope indicate when it is rotating in anticlockwise direction and when It is rotating in clockwise direction? Incoming machine is running slow, incoming machine is running faster (B) Incoming machine is running faster, incoming machine is running slow (C) Pointer rotates only in clockwise direction (D) all of the above 10- In Potier's triangle method, to determine armature leakage reactance and armature reaction mmf separately, the tests performed are----- (A) Open circuit test and short circuit test (B) Open circuit test and zero power factor test (C) Short circuit test and zero power factor test (D) Open circuit test, short circuit test and zero power factor test

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

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