EBK ELECTRIC MOTORS AND CONTROL SYSTEMS
2nd Edition
ISBN: 9781259335143
Author: Petruzella
Publisher: MCGRAW HILL BOOK COMPANY
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Chapter 1.2, Problem 2T
To determine
The reason that ground fault circuit interrupter does not provide overload protection.
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QUESTION 25
Pneumatic timers use a diaphragm and operate on the principle of air displacement.
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Chapter 1 Solutions
EBK ELECTRIC MOTORS AND CONTROL SYSTEMS
Ch. 1.1 - Does the severity of an electric shock increase...Ch. 1.1 - a. Calculate the theoretical body current flow...Ch. 1.1 - Normally a 6 volt lantern battery capable of...Ch. 1.1 - Prob. 4RQCh. 1.1 - What circuit fault can result in an arc flash?Ch. 1.1 - Defineeach of the following terms associated...Ch. 1.1 - Explain why an arc flash is so potentially...Ch. 1.1 - State the piece of electrical safety equipment...Ch. 1.1 - Outline the safety procedure to follow when you...Ch. 1.1 - List three pieces of personal protection...
Ch. 1.2 - Prob. 1RQCh. 1.2 - Prob. 2RQCh. 1.2 - Prob. 3RQCh. 1.2 - List the seven steps involved in a...Ch. 1.2 - Prob. 5RQCh. 1.2 - Prob. 6RQCh. 1.2 - How are the standards contained in the...Ch. 1.2 - Explain the difference between a Code Article and...Ch. 1.2 - Prob. 9RQCh. 1.2 - Prob. 10RQCh. 1.2 - Prob. 11RQCh. 1.2 - Prob. 12RQCh. 1.2 - The voltage between the frame of a 3-phase 208...Ch. 1.2 - Prob. 2TCh. 1.2 - Prob. 3TCh. 1.2 - A hot stick is to be used to open a...Ch. 1.2 - An employee is contemplating using his lockoutlock...Ch. 1.2 - Prob. 1DTCh. 1.2 - Prob. 2DTCh. 1.2 - Why can birds safely rest on high-voltage...
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- Another term used to describe sensitivity in electronic controls is A. temperature. B. gain. C. rpm. D. pressure.arrow_forwardWhat is the difference between Momentary Contact and Maintained Contact?arrow_forwardWhich of the following is not a characteristic ofparallel circuits?a. Total circuit resistance is always less thanthe resistance of the leg with the lowest totalresistance.b. The current through each leg will be differentif the resistance values are different.c. The sum of the resistance in each leg equalsthe total circuit resistance.d. Source voltage will be dropped across eachleg of the parallel circuit.arrow_forward
- Three common controls used in central electric heat applications are thermostats, contactors (or relays), and A. capacitors. B. sequencers. C. cool anticipators.arrow_forwardWhat is the principle of operation for most externally mounted overload protection devices?arrow_forwardWhat are the three main electrical test instruments used in troubleshooting?arrow_forward
- QUESTION 27 Pneumatic timers have better repeat accuracy that electronic timers. True Falsearrow_forward- Industrial Motor Controls, 12.a. What is the purpose of thermostat number 2, IN7, in the mixing vat machine?A. This thermostat is used to monitor the temperature of the incoming fluids.B. This thermostat is used to prevent an over-temperature condition in the event thermostat one sticks open.C. This thermostat is used to turn off the mixing motor after the mixture reaches temperature.D. This thermostat is used to shut off the heater when the chemical mix reaches setpoint.12.b. Why are motor current readings from a frequency inverter not exact readings of motor current?A. Because the output of a frequency inverter is not a sinewaveB. Because a frequency inverter adds a DC voltage level to the AC waveformC. Because a frequency inverter uses a lower voltage sinewaveD. Because the inverter pulses the motor with various sinewave frequenciesarrow_forwardA security system timer controls lights and other electrical component parts. The MTBF for the time is advertised to be 10 months. When should the operator and/or the maintenance associate consider replacing the timer? What is the Availability if the MTTR is 15 hours? Is the Availability good enough?arrow_forward
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