![Electric Motor Control](https://www.bartleby.com/isbn_cover_images/9781133702818/9781133702818_largeCoverImage.gif)
Refer to the circuit shown in Figure 10–6. Assume that when the thermostat contact closes the compressor does not start, but the condenser fan and evaporator fan do start. When troubleshooting the circuit, a voltmeter connected across the compressor contactor coil CC indicates 0 volts. A voltmeter connected across the high-pressure switch indicates 0 volts, and a voltmeter placed across the thermostat contact indicates 0 volts. When the voltmeter is connected across the low-pressure switch it indicates 24 volts. Which of the following conditions could cause this problem?
a. The refrigerant pressure is too high.
b. The compressor contactor coil is open.
c. The refrigerant pressure is too low.
d. The thermostat contact is open.
Fig. 10–6 Pressure switches are often used in air-conditioning circuits.
![Check Mark](/static/check-mark.png)
Want to see the full answer?
Check out a sample textbook solution![Blurred answer](/static/blurred-answer.jpg)
Chapter 10 Solutions
Electric Motor Control
- A step up chopper has an input of 200 volts and output of 250 volts. The blocking period is each cycle is 0.6x10-3 seconds. Find the period of conduction in each cycle and frequency of operation?arrow_forward10 What type of supply is given to the stator of the three-phase induction motor? a. Three phase supply b. Two phase supply c. Four phase supply d. Single phase supplyarrow_forwardWhat is meant by Excitation Control in a Power Systemarrow_forward
- cool control systemarrow_forwardonce. Force Completion This test can be saved and resumed at any point until time has expired. The timer will continue to run if you leave the test. Remaining Time: 34 minutes, 38 seconds. * Question Completion Status: A Moving to another question will save this response. uestion 1 What is the maximum recommended limit of RMS voltage (in percent) for continuous operation of shunt capacitors under contingency condition? O 110 120 130 135 A Moving to another question will save this response. 直 0 a hparrow_forwardAir- cold condensers use? To drive air across the condensing coil. A. ambient evaporation b. A pump c. A temperature-difference fan d. A motor--driven fanarrow_forward
- Refer 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_forwardWhich one of the following statements is not correct about synchronous machine Select one: O a. The rotor dc current is required only for synchronous generator O b. The induced voltage in the stator depends on the rotor dc current O. The resistance of the stator windings can be neglected compared with the value of the synchronous reactance If the synchronous motor is overexcited, then: Select one: O a. The motor will absorb reactive power to the source. O b. The motor will operate at unity power factor. O c. The motor will deliver reactive power to the source. O d. The motor will deliver real power to the source.arrow_forwardDifferentiate transition noise and hysteresis.arrow_forward
- 25.a. There are two wires labeled P1 and P2 at a DC motor's junction box. These wires will attach to whatinternal component of the motor?A. A speed potentiometerB. The parallel windingC. GroundD. A thermostat25.b. As you walk up to a machine, you see a technician tapping on the back section of a DC motor with alead mallet. This technician isA. cleaning the commutator.B. checking for end bell cracks.C. looking for weak or worn brushes.D. reseating the rear end bell on the case.arrow_forwardCalculate the reactance voltage for a machine which runs at 900rpm number of commutator segments is 65, brush width is 1.74 (in commutator segments), coefficient of self induction is 153 the conductor current is 27A.arrow_forwardWhy are the AC ammeter and DC meter necessary in the circuit of Figure 401?arrow_forward
![Text book image](https://www.bartleby.com/isbn_cover_images/9781133702818/9781133702818_smallCoverImage.gif)