Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 7, Problem 5SQ
Why does the coil (CR) in Figure 7–19 drop out when the thermostat touches the open position?
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Chapter 7 Solutions
Electric Motor Control
Ch. 7 - What are control relays?Ch. 7 - What are typical uses for control relays?Ch. 7 - What are the advantages of a mechanically held...Ch. 7 - Why are mechanically held relays energy-saving...Ch. 7 - Why does the coil (CR) in Figure 719 drop out when...Ch. 7 - Which device is used to connect the load to the...Ch. 7 - Which device is used to connect the load to the...Ch. 7 - What is optoisolation?Ch. 7 - What type of device is used to suppress voltage...
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- What are the two necessary conditions for a thyristor to begin conduction?and Once a thyristor begins to conduct, what condition(s) is necessary to cease conduction? Also, why is the conduction angle greater with an inductive load than with a purely resistive load?arrow_forwardAn inductive load of 100 Ohm and 200mH connected in series to thyristor supplied by 200V dc source. The latching current of a thyristor is 45ma.and the duration of the firing pulse is 50us where the input supply voltage is 200V. Will the thyristor get fired?arrow_forwardHow much voltage will be applied to coil 1CR when it is energized?arrow_forward
- Explain why the lockout relay coil energizes instead of the contactor coil. See Figure 6.34.arrow_forwardWhy will the blowout coil also operate on AC?arrow_forwardIn an On-Off AC Voltage controller, the ON time is 50 cycles and duty cycle is 0.25. The OFF time cycles will be O a. 150 O b. 75 O c. 25 O d. 50arrow_forward
- what are standard impluse voltages, mention their values ?arrow_forwardWhy PMMC Voltmeters can not be used to measure higher voltages directly? a. because the size of the coils will raise b. because the coils will not be present at all c. because of the lesser current ratings. d. because of the lesser size problemsarrow_forwardis the simplest surge diverter among the options O a. Expulsion type O b. Rod Gap O C. Non Linear Resistor type O d. Valve typearrow_forward
- An AC ammeter is connected in series with the primary winding of T1. What is the expected current reading? An AC ammeter is connected in series with the secondary winding of T1. What is the expected current reading? An AC ammeter is connected in series with R1. What is the expected current reading? NOTE: Idc for HW rectifier = 0.318 * Ipeak = 0.45 * Irms Describe/Explain briefly the purpose/use of the array (series-parallel) connection of the rectifier diodes in the given circuit.arrow_forwardHow much resistance must be put in series with a 40-microfarad-capacitor connected to a 110 volt, 120-cycle source to limit the current to 3 amperes? What will be the drop across the capacitor and across the resistor? How much power is expended?arrow_forwardWhat will happen if the DC voltage in the clamping circuit is replaced by an AC source?arrow_forward
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