Electrical Wiring: Residental - With Plans (Paperback) Package
18th Edition
ISBN: 9781305416376
Author: MULLIN
Publisher: Cengage
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Chapter 13, Problem 12R
Electronic dimmers of the type sold for residential use (shall) (shall not) be used to control fluorescent luminaires. These dimmers (are) (are not) intended for speed control of small motors. (Circle the correct answers.)
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5. An automatic switch or cutout is allowed in the equipment grounding conductor circuit when
A. there's a redundant equipment grounding conductor in the circuit.
B. the power sources are disconnected when operated.
C. it's bonded around the disconnecting device.
D. it also opens the neutral.
Advanced industrial motor
45. A switch or circuit breaker can be used as both the controller and disconnecting means if
it
a. opens all ungrounded conductors as required by NEC 430.103
b. is protected by an overcurrent device in each ungrounded conductor
c. is manually operable, or both power and manually operable
d. All of these answers
Chapter 13 Solutions
Electrical Wiring: Residental - With Plans (Paperback) Package
Ch. 13 - Prob. 1RCh. 13 - Prob. 2RCh. 13 - Prob. 3RCh. 13 - How many wires must be run between an incandescent...Ch. 13 - Complete the wiring diagram for the dimmer and...Ch. 13 - Is it possible to dim standard fluorescent...Ch. 13 - a. How many wires must be run between a...Ch. 13 - Explain why fluorescent lamps having the same...Ch. 13 - What is the total current consumption of the track...Ch. 13 - Prob. 10R
Ch. 13 - Prob. 11RCh. 13 - Electronic dimmers of the type sold for...Ch. 13 - Prob. 13RCh. 13 - A layout of the outlets, switches, dimmers, track...Ch. 13 - Prob. 15RCh. 13 - Prob. 16RCh. 13 - Prob. 17RCh. 13 - Prob. 18RCh. 13 - May a standard electronic dimmer be used to...Ch. 13 - Prob. 20RCh. 13 - Why should the power be turned off when hooking up...
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- True or False 1. The point of connection of a motor for its electrical supply is called junction box. 2. The bearing placed in the shaft of the generator is included as stator part. 3. Basically, not all generators are AC generator at first, even DC generator 4. DC generator can be used as an emergency generator. 5. Circuit breakers are used in a motor circuit protection rather than fuses (safety switch).arrow_forwardThe disconnecting means for a motor controller shall be designed so that it does not _______ automatically per NEC 430.103 A. Open B. Close C. Restart D. Shutdownarrow_forwardThe pointer moving across a scale in the speedo meter is an example for ___________ of the instrumentation system. a.Feed back element b.Sensing element c.Data presentation element d.Signal conditioning elementarrow_forward
- 3. What size inverse time circuit breaker will be required for short-circuit and ground- fault protection for a 1 horsepower, 120-volt motor?arrow_forwardMake a Wiring Diagram of Two – Station Start Stop Motor Control.arrow_forwardGenerators can be connected to the electrical system of the residence in several ways (Select all answers that apply) Group of answer choices A. permanent generator where the neutral is not switched by the transfer switch B. portable generator that has the neutral bonded to the frame and is connected to the dwelling electrical system transfer equipment by a flexible cord C. permanent generator where the neutral is switched by the transfer switch D. portable generator that has the neutral isolated or floated from the frame and is connected to the dwelling electrical system transfer equipment by a flexible cordarrow_forward
- 2. A push-button switch that contains a spring to return the button to its original after being pushed is the _______ switch. A. toggleB. slideC. push on/push off D. momentary action 3. If a mechanical switch is used to control a digital number display circuit, the likely result will be A. contact bounce.B. an extremely bright display.C. a blown fuse. D. a short circuit.arrow_forwardQuestion 2 Draw the control circuit complete with referencing number and terminal number for an overhead crane according to the sequence described below: Figure 5: An overhead crane Press pushbutton S1 (N/O), motor will move forward and green pilot light H1 will turn on for 10 seconds. This is to allow the motor to reach the end limit of the crane. After the motor reaches the end of travel (indicated by the delay time durations), the motor will stop and red pilot light H2 will turn On. • The control supply for this circuit is 48Vac. Safety features must be included where: i. The motor must stop at condition the thermal overload relay tripped and an emergency button S2 is pressed. .arrow_forward8.a. Which of the following most accurately describes the difference between a contactor and a starter?A. A starter contains a contactor and some additional protective circuitry.B. A starter is always mounted in an enclosure.C. A starter contains reversing contacts.D. A starter is always three-phase while a contactor may be single-phase or three-phase.8.b. The main bus in a motor control center is used toA. reduce the possibility of overload with large loads.B. enclose motors within a protective shield.C. distribute power to all starters in the center.D. reduce the voltage of the plant's supply.arrow_forward
- (b) () Discuss the cascade control scheme for a heat exchanger system with a neat diagram. (ii) List down any two merits and two demerits of a cascade control system over ratio control system.arrow_forwardPlease answer all subpart Thanks sirarrow_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
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