Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 11, Problem 3SQ
To determine
Explain the reason for not stopping of pump when the upper float switch opens its circuit in Figure 11-5 in the textbook.
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- In Figure 1110, 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.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_forward4. Refer to the circuit shown in Figure 27–4. Assume that the HOA switch is in the Hand position and that the motor is running. Now assume that OL1 opens its contacts. Would this cause the pump motor to stop operating? Explain your answer. 5. Refer to the circuit shown in Figure 27–2. Assume that the HOA switch is in the Hand position and that the motor is running. Now assume that OL2 opens its contacts. Would this stop the operation of the fan motor? Explain your answer.arrow_forward
- Explain why fuse B isnot interrupted when the fan motor stalls.arrow_forwardDraw a Start – Stop Full Voltage 3-phase AC Motor Starter circuit. The power circuit should be 220 V and the control circuit is 220V. Assume that the working voltage of the magnetic contactor is 220 V.arrow_forwardExplain the function of Ballast and Starter in the discharge lamparrow_forward
- Three - wire control prevent the restarting of machinery when power is restored.arrow_forwardThe fuse in one of the supply phases of a running 3-phase I.M. blows off. Will the motor continue to run at ( i) original speed (ii) reduced speed (iii) come to stand still?arrow_forwardq. 7 Refer to the Load Balance Diagram. What is the Takt time? Group of answer choices a. 10 minutes b. 20 minutes c. 30 minutes d. Impossible to determine from this diagramarrow_forward
- Why we do not have the motor continue running in its star connection.arrow_forwardSelect 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_forwardA starter turns very slowly and has excessive cranking current draw. When removed from the vehicle and bench tested, the starter spins normally and current draw is within specifications. Technician A says poor battery connections may be the cause. Technician B says an internal engine problem may be the cause. Who is correct?arrow_forward
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