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x 7) Breakdown torque is...? a. The point at which the rotor loses synchronization The point at which the motor transitions from start up to its normal operating range The torque at startup c. d. The torque at which the motor experiences extreme overheating 8) Locked Rotor Torque is important is selecting a replacement motor when...? a. The load is difficult to start b. x X Limiting starting current is a significant concern Transients may cause the rotor to lose synchronization A high efficiency motor is required d. 9) All synchronous motors have the following characteristics. a. Constant speed operations Cannot be used with variable frequency drives (VFDs) Require special features to assist in starting d. Utilize emf induced by rotor slip for steady state operation 10) Magnetic reversing controls have the following characteristics? a. Always utilize mechanical interlocks with the electrical switch(s) Can use normally open auxiliary contacts in the opposite circuit path for electrical interlocks C. Almost always utilize mechanical interlocks in contactor d. Can use normally closed auxiliary contacts in the opposite circuit path for electrical interlocks 11) What can lead to an early failure of a motor? a. Continuous operation at rated load Long periods of time sitting idle in an environmentally controlled space c. Dirty and damp environments Extreme heat or cold

x 7) Breakdown torque is...? a. The point at which the rotor loses synchronization The point at which the motor transitions from start up to its normal operating range The torque at startup c. d. The torque at which the motor experiences extreme overheating 8) Locked Rotor Torque is important is selecting a replacement motor when...? a. The load is difficult to start b. x X Limiting starting current is a significant concern Transients may cause the rotor to lose synchronization A high efficiency motor is required d. 9) All synchronous motors have the following characteristics. a. Constant speed operations Cannot be used with variable frequency drives (VFDs) Require special features to assist in starting d. Utilize emf induced by rotor slip for steady state operation 10) Magnetic reversing controls have the following characteristics? a. Always utilize mechanical interlocks with the electrical switch(s) Can use normally open auxiliary contacts in the opposite circuit path for electrical interlocks C. Almost always utilize mechanical interlocks in contactor d. Can use normally closed auxiliary contacts in the opposite circuit path for electrical interlocks 11) What can lead to an early failure of a motor? a. Continuous operation at rated load Long periods of time sitting idle in an environmentally controlled space c. Dirty and damp environments Extreme heat or cold

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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7) Breakdown torque is...? a. The point at which the rotor loses synchronization The point at which the motor transitions from start up to its normal operating range The torque at startup The torque at which the motor experiences extreme overheating X - X c. d. 8) Locked Rotor Torque is important is selecting a replacement motor when...? a. The load is difficult to start b. Limiting starting current is a significant concern C. Transients may cause the rotor to lose synchronization d. A high efficiency motor is required 9) All synchronous motors have the following characteristics. a. Constant speed operations Cannot be used with variable frequency drives (VFDs) Require special features to assist in starting d. Utilize emf induced by rotor slip for steady state operation 10) Magnetic reversing controls have the following characteristics? a. Always utilize mechanical interlocks with the electrical switch(s) bCan use normally open auxiliary contacts in the opposite circuit path for electrical interlocks C. Almost always utilize mechanical interlocks in contacto d. Can use normally closed auxiliary contacts in the opposite circuit path for electrical interlocks 11) What can lead to an early failure of a motor? a. Continuous operation at rated load Long periods of time sitting idle in an environmentally controlled space c. Dirty and damp environments d. Extreme heat or cold 12) A nine-lead, three-phase motor can be configured for: a. High and low voltage, at the time of installation Reduced voltage/split phase starting in the high-voltage configuration C. Delta or wye, at the time of installation d. Reversed direction, typically by interchanging leads L1 and L3 13) What would you use the Service Factor from a motor nameplate NOT used for? a. Determine the motor ability to handle intermittent overloads b. Determine the motor breaker and cable size/ratings C. Determine the motor ability to handle unbalanced voltages d. Determine the motor ability to handle duty cycle 3
Transcribed Image Text:7) Breakdown torque is...? a. The point at which the rotor loses synchronization The point at which the motor transitions from start up to its normal operating range The torque at startup The torque at which the motor experiences extreme overheating X - X c. d. 8) Locked Rotor Torque is important is selecting a replacement motor when...? a. The load is difficult to start b. Limiting starting current is a significant concern C. Transients may cause the rotor to lose synchronization d. A high efficiency motor is required 9) All synchronous motors have the following characteristics. a. Constant speed operations Cannot be used with variable frequency drives (VFDs) Require special features to assist in starting d. Utilize emf induced by rotor slip for steady state operation 10) Magnetic reversing controls have the following characteristics? a. Always utilize mechanical interlocks with the electrical switch(s) bCan use normally open auxiliary contacts in the opposite circuit path for electrical interlocks C. Almost always utilize mechanical interlocks in contacto d. Can use normally closed auxiliary contacts in the opposite circuit path for electrical interlocks 11) What can lead to an early failure of a motor? a. Continuous operation at rated load Long periods of time sitting idle in an environmentally controlled space c. Dirty and damp environments d. Extreme heat or cold 12) A nine-lead, three-phase motor can be configured for: a. High and low voltage, at the time of installation Reduced voltage/split phase starting in the high-voltage configuration C. Delta or wye, at the time of installation d. Reversed direction, typically by interchanging leads L1 and L3 13) What would you use the Service Factor from a motor nameplate NOT used for? a. Determine the motor ability to handle intermittent overloads b. Determine the motor breaker and cable size/ratings C. Determine the motor ability to handle unbalanced voltages d. Determine the motor ability to handle duty cycle 3
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