Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Question
Chapter 15, Problem 16RQ
To determine
Reason of finding an opened run winding on a motor by using ohmmeter not a voltmeter.
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For a cylindrical-rotor synchronous machine, the magnitude of the internal generated voltage is
|Eg| = 240 volts, and the magnitude of the terminal voltage is |Vt| = 200 volts. Which of the
following is true?
a. The machine is operating as a generator.
O b. The machine is operating as a motor.
O C. Information is insufficient to determine the operating mode of this machine.
Question 5: Explain what happens if it is operated without a starting rheostat; What else is used instead of the starter rheostat and how is the speed adjustment done in D.C series motor? Explain.
27
Chapter 15 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 15 - Name three types of automatic controls.Ch. 15 - Two categories ofelectric controls...Ch. 15 - What circuit is energized with the thermostat Y...Ch. 15 - The component in the system that is energized when...Ch. 15 - The ________terminal must be energized in the...Ch. 15 - The hot circuit in the thermostat is the...Ch. 15 - Is the heat anticipator in series or parallel with...Ch. 15 - The cooling anticipator is wired A. in parallel...Ch. 15 - Which anticipator is adjustable, heat or cool?Ch. 15 - True or False: The indoor fan must always run...
Ch. 15 - True or False: When the control transformer is not...Ch. 15 - Which of the following should be turned off while...Ch. 15 - The _______diagram is used to locate different...Ch. 15 - To trace the circuits in the unit, the...Ch. 15 - Prob. 15RQCh. 15 - Prob. 16RQCh. 15 - Prob. 17RQCh. 15 - True or False: Open switches will always read...Ch. 15 - Explain why a service technician must always know...
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- An open winding or a shorted winding can be determined with which of the following instruments? A. Voltmeter B. Ammeter C. Ohmmeterarrow_forwardExplain why controlling the rotor current also controls the stator current.arrow_forwardState the physical differences between a run and a start capacitor.arrow_forward
- A motor is tripping out on overload. The motor nameplate reveals a full load current of 68 amperes. When the motor is operating under load, an ammeter indicates the following: Phase #1 = 106 amperes, Phase #2 = 104 amperes, and Phase #3 = 105 amperes. What is the most likely problem with this motor?arrow_forwardHow many overload sensors are required by the National Electrical Code to protect a direct current motor?arrow_forwardWhat type of armature winding is generally used for machines designed to operate on low voltage and high current?arrow_forward
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