Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 10, Problem 6SQ
Refer to the circuit shown in Figure 10–5. If the pressure should become high enough for the pressure switch to close and stop the motor, is it possible to restart the motor before the pressure drops to a safe level?
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Chapter 10 Solutions
Electric Motor Control
Ch. 10 - Describe how pressure switches are connected to...Ch. 10 - What type of pressure switch is generally used to...Ch. 10 - A pressure switch is set to cut in at a pressure...Ch. 10 - A pressure switch is to be installed on a system...Ch. 10 - A pressure switch is to be installed in a circuit...Ch. 10 - Refer to the circuit shown in Figure 105. If the...Ch. 10 - Refer to the circuit shown in Figure 105. Assume...Ch. 10 - Refer to the circuit shown in Figure 106. Assume...Ch. 10 - Refer to the circuit shown in Figure 106. Assume...Ch. 10 - Refer to Figure 106. When the thermostat contact...
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- Refer to the circuit shown in Figure 105. Assume that the motor is running and an overload occurs, which causes the OL contact to open and disconnect coil M to stop the motor. What effect does the opening of the overload contact have on the pressure switch circuit?arrow_forwardWhat type of motor should never be operated at no load?arrow_forwardWhat provides the running overload protection for the pump motor? ______arrow_forward
- Describe how pressure switches are connected to start and stop (a) small motors and (b) large motors.arrow_forwardIf an electrical defect occurs in the electronic powersteering(EPS) system, __ .a. the system continues to operate normally, but theEPS warning light is illuminatedb. the system continues to operate with a slightlyreduced power-steering assistc. the EPS control unit shuts the system down byopening the fail-safe and power relaysd. the EPS control unit locks the armature in thesteering gear to prevent armature and screw shaftdamagearrow_forwardSelect the best answer for each of the following. Thermal overload relays react to a. high ambient temperatures and excessive heating due to overload currents. b. heavy mechanical loads. c. heavy electrical loads. d. rising starting currents.arrow_forward
- A forward-reverse motor starter must be prevented from form reversing while running in the forward rotation. What is done? a. install electrical limit switches b. install electrical interlocking c. install a NC stop button d. install a NO pushbutton.arrow_forwardSelect the best answer for each of the following. When the reset button does not reestablish the control circuit after an overload, the probable cause is a. the overload heater is too small. b. the overload trip has not cooled sufficiently. c. the auxiliary contacts are defective. d. the overload heater is burned out.arrow_forwardIn Figure 1110, assume that both motors are running. What would be the action of the circuit if the overload contact connected in series with coil 1M should open? a. Both motors will continue to run. b. Both motors will stop running. c. Pump motor 1 will continue to operate and pump motor 2 will stop running. d. Pump motor 1 will stop running and pump motor 2 will continue to operate.arrow_forward
- 165. What is the slip of a synchronous motor running at rated speed?arrow_forwardHow many poles are required on motor starters for the following motors:(a)240-volt, single-phase induction motor,(b)440-volt, three-phase induction motor?arrow_forwardAssume the motor is running. What happens when the stop button is pressed and then the start button is pressed immediately?arrow_forward
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