Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 19, Problem 9RQ
To determine
The voltage which is not a typical operating voltage for relays contactors and motor starters.
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What happens when the low-voltage current flow in the coil primary winding is interrupted by the switching device?
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the purpose of over load protection on a motor is to protect the
A load is an electrical device that__________.a. produces electricityb. directs the flow of electricityc. assists in the starting of motorsd. uses electricity to do useful work
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Refrigeration and Air Conditioning Technology (MindTap Course List)
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- An open winding in an electric motor means that A. the winding is making contact with the motor frame. B. one winding is making contact with another winding. C. a wire in one winding is broken. D. the centrifugal switch to the start winding is open.arrow_forwardState the physical differences between a run and a start capacitor.arrow_forwardWhat are the three types of armature windings?arrow_forward
- What is the function of the compensating winding?arrow_forwardWhich of the following is not part of the starter motor circuit? Battery Starting safety switch Starter motor Relay solenoidarrow_forwardRefer to Figure 211 to answer the following questions. How much voltage will be applied to coil 1CR when it is energized?arrow_forward
- Which of the following devices may be wired into the starting circuit of a motor to improve the starting torque? A. Another winding B. A start capacitor C. A thermostat D. A winding thermostatarrow_forwardThe two popular operating voltages for residences are_________ V and _________ V.arrow_forwardWhat type of voltage is produced in all rotating armatures?arrow_forward
- What is the operating voltage of most magnetic control systems?arrow_forwardHow is the shunt field connected in relation to the armature?arrow_forwardRefer to the schematic diagram in Figure 318. Assume that the motor is not running. When the third speed push button is pressed, the motor starts in its lowest speed. After a delay of 3 seconds, the motor accelerates to second speed and 3 seconds later to third speed. After a period of about 1 minute, the fourth speed push button is pressed, but the motor does not accelerate to fourth speed. Which of the following could cause this problem? a. Control relay CR2 coil is open. b. S2 contactor coil is open. c. CR3 coil is shorted. d. S3 contactor coil is open.arrow_forward
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