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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(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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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.
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