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Choose the correct answer: 1-We avoid line starting of induction motor and use starter because... (A) It will run in reverse direction (B) It will pick up very high speed and may go out of step Motor takes five to seven times its full load current (D) Starting torque is very high 2-DOL starting of induction motors is usually restricted to........... A Low horsepower motors (D) High speed motors (B) Variable speed motors (C) High horsepower motors 3- The method which can be used for the speed control of induction motor from stator side is......... (A) V/f control (B) Controlling number of stator poles to control Ns (C) Adding rheostats in stator circuit All of these 4-In cumulatively cascade method for speed controlling, if PA is the number of poles of main motor and PB is the number of poles of auxiliary motor. Then the speed of the rotor B is given by 120f/PA + PB (B) 120f/PA-PB (C) 120f/PA 5-The crawling in the induction motor is caused by.............. (A) low voltage supply (B) high loads (D) improper design of the machine (D) 120f/PB harmonics developed in the motor 6-In case the field of a synchronous motor is under excited, the power factor will be............. (A) leading Blagging (C) zero (D) unity 7-The damping winding in a synchronous motor is generally used........... (A) to provide starting torque only (B) to reduce noise level (C) to reduce eddy currents (D) to prevent hunting and provide the starting torque 8- In a salient pole synchronous generator, the direct axis reactance is........... ⒶGreater than quadrature axis reactance (C) Equal to quadrature axis reactance (B) Less than quadrature axis reactance (D) None of the above 9- The electrical power output of an alternator will be maximum, if the power angle is equal to....... (A) 0 degree (B) 45 degree 90 degree (D) 180 degree 10- What does the pointer of synchroscope indicate when it is rotating in anticlockwise direction? Incoming machine is running slow (B) Incoming machine is running faster (C) Pointer rotates only in clockwise direction (D) all of the above I need to choose the correct points with a visual explanation and description if possible.

Choose the correct answer: 1-We avoid line starting of induction motor and use starter because... (A) It will run in reverse direction (B) It will pick up very high speed and may go out of step Motor takes five to seven times its full load current (D) Starting torque is very high 2-DOL starting of induction motors is usually restricted to........... A Low horsepower motors (D) High speed motors (B) Variable speed motors (C) High horsepower motors 3- The method which can be used for the speed control of induction motor from stator side is......... (A) V/f control (B) Controlling number of stator poles to control Ns (C) Adding rheostats in stator circuit All of these 4-In cumulatively cascade method for speed controlling, if PA is the number of poles of main motor and PB is the number of poles of auxiliary motor. Then the speed of the rotor B is given by 120f/PA + PB (B) 120f/PA-PB (C) 120f/PA 5-The crawling in the induction motor is caused by.............. (A) low voltage supply (B) high loads (D) improper design of the machine (D) 120f/PB harmonics developed in the motor 6-In case the field of a synchronous motor is under excited, the power factor will be............. (A) leading Blagging (C) zero (D) unity 7-The damping winding in a synchronous motor is generally used........... (A) to provide starting torque only (B) to reduce noise level (C) to reduce eddy currents (D) to prevent hunting and provide the starting torque 8- In a salient pole synchronous generator, the direct axis reactance is........... ⒶGreater than quadrature axis reactance (C) Equal to quadrature axis reactance (B) Less than quadrature axis reactance (D) None of the above 9- The electrical power output of an alternator will be maximum, if the power angle is equal to....... (A) 0 degree (B) 45 degree 90 degree (D) 180 degree 10- What does the pointer of synchroscope indicate when it is rotating in anticlockwise direction? Incoming machine is running slow (B) Incoming machine is running faster (C) Pointer rotates only in clockwise direction (D) all of the above I need to choose the correct points with a visual explanation and description if possible.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Choose the correct answer: 1-We avoid line starting of induction motor and use starter because... (A) It will run in reverse direction (B) It will pick up very high speed and may go out of step Motor takes five to seven times its full load current (D) Starting torque is very high 2-DOL starting of induction motors is usually restricted to........... A Low horsepower motors (D) High speed motors (B) Variable speed motors (C) High horsepower motors 3- The method which can be used for the speed control of induction motor from stator side is......... (A) V/f control (B) Controlling number of stator poles to control Ns (C) Adding rheostats in stator circuit All of these 4-In cumulatively cascade method for speed controlling, if PA is the number of poles of main motor and PB is the number of poles of auxiliary motor. Then the speed of the rotor B is given by 120f/PA + PB (B) 120f/PA-PB (C) 120f/PA 5-The crawling in the induction motor is caused by.............. (A) low voltage supply (B) high loads (D) improper design of the machine (D) 120f/PB harmonics developed in the motor 6-In case the field of a synchronous motor is under excited, the power factor will be............. (A) leading Blagging (C) zero (D) unity 7-The damping winding in a synchronous motor is generally used........... (A) to provide starting torque only (B) to reduce noise level (C) to reduce eddy currents (D) to prevent hunting and provide the starting torque 8- In a salient pole synchronous generator, the direct axis reactance is........... ⒶGreater than quadrature axis reactance (C) Equal to quadrature axis reactance (B) Less than quadrature axis reactance (D) None of the above 9- The electrical power output of an alternator will be maximum, if the power angle is equal to....... (A) 0 degree (B) 45 degree 90 degree (D) 180 degree 10- What does the pointer of synchroscope indicate when it is rotating in anticlockwise direction? Incoming machine is running slow (B) Incoming machine is running faster (C) Pointer rotates only in clockwise direction (D) all of the above
Transcribed Image Text:Choose the correct answer: 1-We avoid line starting of induction motor and use starter because... (A) It will run in reverse direction (B) It will pick up very high speed and may go out of step Motor takes five to seven times its full load current (D) Starting torque is very high 2-DOL starting of induction motors is usually restricted to........... A Low horsepower motors (D) High speed motors (B) Variable speed motors (C) High horsepower motors 3- The method which can be used for the speed control of induction motor from stator side is......... (A) V/f control (B) Controlling number of stator poles to control Ns (C) Adding rheostats in stator circuit All of these 4-In cumulatively cascade method for speed controlling, if PA is the number of poles of main motor and PB is the number of poles of auxiliary motor. Then the speed of the rotor B is given by 120f/PA + PB (B) 120f/PA-PB (C) 120f/PA 5-The crawling in the induction motor is caused by.............. (A) low voltage supply (B) high loads (D) improper design of the machine (D) 120f/PB harmonics developed in the motor 6-In case the field of a synchronous motor is under excited, the power factor will be............. (A) leading Blagging (C) zero (D) unity 7-The damping winding in a synchronous motor is generally used........... (A) to provide starting torque only (B) to reduce noise level (C) to reduce eddy currents (D) to prevent hunting and provide the starting torque 8- In a salient pole synchronous generator, the direct axis reactance is........... ⒶGreater than quadrature axis reactance (C) Equal to quadrature axis reactance (B) Less than quadrature axis reactance (D) None of the above 9- The electrical power output of an alternator will be maximum, if the power angle is equal to....... (A) 0 degree (B) 45 degree 90 degree (D) 180 degree 10- What does the pointer of synchroscope indicate when it is rotating in anticlockwise direction? Incoming machine is running slow (B) Incoming machine is running faster (C) Pointer rotates only in clockwise direction (D) all of the above
I need to choose the correct points with a visual explanation and description if possible.
Transcribed Image Text:I need to choose the correct points with a visual explanation and description if possible.
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