Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 11, Problem 6SQ
In Figure 11–10, 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.
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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?
A 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 Thermal Overload Protection.
If the full load current of a three-phase motor is 40 Amperes, the size of the circuit breaker is
a. 100 AT c. 300AT
b. 120 AT d. 80 AT
A 50-hp, 440-volt, 3-phase, 1750 rpm, SCRIM, how many pair of poles
a. 4 c. 3
b. 2 d. 1
The required rated voltage applied to a six leads out motor are
a. 760-volts and 440-volts c. 440-volts and 254-volts
b. 220-volts and 127-volts d. All of the above
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Select the best answer for each of the following. If an operator pushes a start button on a three-phase induction motor and the motor starts to hum, but not run, the probable trouble is a. one fuse is blown and the motor is single phasing. b. the overload trip needs resetting. c. the auxiliary contact is shorted. d. one phase is grounded.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_forwardSelect the best answer for each of the following. The purpose of overload protection on a motor is to protect the a. motor from sustained overcurrents. b. wire from high currents. c. motor from sustained overvoltage. d. motor from short circuits.arrow_forward
- At standstill condition, the back emf is zero, so the motor can be safely turned ON without a starter. Select one: OTrue O Falsearrow_forwardA motor operates on a periodic duty cycle consisting of a loaded period of 40 min and no load period of 22 min. The maximum temperature rise is 90֩ C. Heating and cooling time constants are 55 and 77 min respectively. When operating continuously on no load the temperature rise is 13֩ C. Determine: a- Minimum temperature during the duty cycle. b- Temperature when the motor is loaded continuously.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_forward
- If 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_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 Conductor size.arrow_forwardRefer 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_forward
- What type of motor should never be operated at no load?arrow_forwardD.b- A DC motor will normally require that you replace which one of the following components on a regularschedule?A. BrushesB. ArmaturesC. GearsD. BearingsD.c- You're doing a PM inspection on a small chain-drive system. You see one side of the sprockets is shinywhile the opposite side is dull. This means that theA. chain is the wrong size.B. sprockets are worn.C. chain is worn.D. sprockets are misaligned.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 Branch Circuit Protection.arrow_forward
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