Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 60, Problem 10SQ
To determine
Choose the option that represents the consequence for the given condition.
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Chapter 60 Solutions
Electric Motor Control
Ch. 60 - What are the three main electrical test...Ch. 60 - What is the advantage of a plunger-type voltage...Ch. 60 - A motor is tripping out on overload. The motor...Ch. 60 - A motor is tripping out on overload. The motor...Ch. 60 - Refer to the circuit shown in Figure 6016. The...Ch. 60 - Refer to the circuit shown in Figure 6016. Assume...Ch. 60 - Prob. 7SQCh. 60 - Prob. 8SQCh. 60 - Refer to the circuit shown in Figure 6016. If a...Ch. 60 - Prob. 10SQ
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- Refer to the circuit shown in Figure 105. 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?arrow_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_forwardRefer 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_forward
- you are working as a plant electrician. you are told that a large DC motor was returned from the rewind shop and was installed on the previous shift. the motor seemed to operate properly until load was added, the motor then stopped, reversed direction, and began to run at a high speed. what is the probable cause of the trouble, and what would you do to correct the problem?arrow_forwardquestion 7: If the timer is set for 10 seconds when will motor 2 start? a 10 seconds after the start button is pushed b 10 seconds after the control relay closes c 10 seconds after motor 1 starts d Instantly when the start button is pushedarrow_forward8.a. What is the purpose of relay CRE in the roll stand machine?A. Relay CRE is used as an emergency stop relay.B. Relay CRE is used to control an alarm light.C. Relay CRE is used to power the PLC.D. Relay CRE is used to power the input modules. 8.b. Which one of the following statements is true of a disabled contact or coil?A. The disabled element has been automatically disabled due to module failure.B. The disabled element is held false by the PLC.C. A disabled contact or coil is caused by a faulty memory location in the PLC.D. A contact must be in the disabled state before it can be forced ON or OFF.arrow_forward
- Select 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_forwardExplain (i) control relay and (ii) Thermal overload relay? please dont copyarrow_forward7. Which statement is true for the process-control relay ladder diagram shown in the figure? A. The pressure switch, temperature switch, and push button must be closed for the motor to start. B. With the temperature switch closed, the motor will start once the push button is pressed. C. With the pressure switch closed and the push button released, the motor will start. D. Only the temperature switch has to close for the motor to start.arrow_forward
- What safely feature does the conbination starter provide that individual motor starting assemblies do not?arrow_forwardA 460VAC rated, 60 Hz, 125-Hp Three-phase induction type motor is to be connected for across-the-line starting. The nameplate indicates the motor’s maximum ampere rating, 160A. It has a NEMA code letter B. The ambient temp of the installation place is and TW copper will be used. Short-circuit protection device that will be used is Inverse Time Breaker. Calculate the Motor Starter Size.arrow_forwardThere are 2 1000Watt 3-phase asynchronous motors in a Walnut Cracking machine (it is desirable to operate the motors in a way that they remain in star connection). When the "Start" button is pressed, the 1st engine will start immediately, 3 seconds after the 1st engine starts, the 2nd engine will also start. After the two engines work together for 4 seconds, the 1st engine will stop, the 2nd engine will start and stop for 10 more seconds. If the "Stop" button is pressed at any stage of the operations, the motors will stop. The rotation directions of the motors are required to be opposite to each other. Draw the necessary power and control circuit.arrow_forward
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