Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 1, Problem 7SQ
To determine
Choose the best option that represents the switch, which can be used to control the motor remotely.
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8.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.
(b) Your team are been assigned to develop a portable electrical car jack as shown in Figure 3.
The portable electrical car jack has four subsystems; electric wrench, electric jack, electric
pump and LED torch light.
(i) Create a design tree that include the system hierarchy and components.
(ii) Create a functions structure diagram.
(iii) Develope a failure mode and effects analysis (FMEA) table that consist of any two
subsystems of the portable electrical car jack.
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- Which of the following is a safety device in a motor control circuit. Select one: O a. selector switch O b. lamp O c. motor contactor O d. stop push button O e. thermal overload relay (TOR)arrow_forwardWhat are some applications of temperature-actuated switches?arrow_forwardIn the simple lamp dimmer shown here, what method of power control is being used? AC supply Triac Select the correct response. burst firing proportional control feedback control phase controlarrow_forward
- A motor starter contains protection devices to prevent an overcurrent condition in the motor's circuit. These devices are known as A. thermal overloads. B. circuit breakers. C. thermal links.D. fuses.arrow_forward9.a. A servo system is oscillating at standstill. This is an indication thatA. the following error limit has been exceeded.B. a motor winding is open.C. the system gain is too high. 9.b. In a DC servo motor system, the tachometer feeds back a voltage that’s proportional to motor speed.Where does this voltage go to?A. The interpolator cardB. The driverC. The CPU in the main controllerarrow_forwardElectrical Engineering control system solve the question quickly and with the stepsarrow_forward
- QUESTION 12 The proper way to determine the required over-current protection is to: determine the FLA based on the nameplate. Use the standard rule of thumb that the over-current protection shall be 7 to 10x the locked rotor amps. determine the watts by converting the HP rating on the nameplate to watts. to determine the FLC by looking up the value in the appropriate table(s) in the NEC as they relate to the horsepower of the motor.arrow_forwardDefine controllability in the control system.arrow_forward5-Draw the diagram of a control valve showing all the parts. Explain the pneumatic actuator in detailarrow_forward
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