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 20, Problem 10RQ
To determine
The resistance in a three-phase motor for good operating condition.
Expert Solution & Answer
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Students have asked these similar questions
Problem 5
1.
Where and why is a centrifugal switch used in a split-phase motor?
2.
Why and where is a capacitor used in the single-phase AC motor?
3. What type of motor would you select to perform each of the following jobs?
(a) Electric drill:
(b) Refrigerator:
(c) Hair driers and desk fans:
(d) Air Conditioner Fan:
(e) XY plotters and printers:
(f) Electric clock:
Adding resistance to the rotor circuit of
:induction motor will
Reduced the starting current and increase the starting O
.torque
Increase the starting current and increase the starting O
.torque
Increase the power transferred from stator to rotor and O
.decrease the starting torque
In dc. motor, the undirectional torque
is produced with the help of
*
Chapter 20 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 20 - True or False: If a sleeve bearing fails in a...Ch. 20 - An open winding in an electric motor means that A....Ch. 20 - There is a short circuit in an electric motor...Ch. 20 - An open winding or a shorted winding can be...Ch. 20 - A decrease in resistance will cause the amperage...Ch. 20 - Prob. 6RQCh. 20 - Prob. 7RQCh. 20 - To determined the capacitance of a capacitor, a...Ch. 20 - State the physical differences between a run and a...Ch. 20 - Prob. 10RQ
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- A motor works when it is connected to AC. By mistake you connect it to DC, but you see it also works with DC. What kind of motor is it?arrow_forwardAn open winding in an electric motor means that A. the winding is making contact with the motor frame. B. one winding is making contact with another winding. C. a wire in one winding is broken. D. the centrifugal switch to the start winding is open.arrow_forwardName three factors that determine the amount of torque developed by a wound rotor induction motor.arrow_forward
- What are the three types of armature windings?arrow_forwarda. Motor constant and efficiency for unloaded motor. Does the motor constant depend on the angular speed? Does motor efficiency n = depend on the angular speed w of the motor? bỊ Loaded Motor Does the motor constant depend on the load? When the load on the motor increases, does the current increase, remain constant or increase?arrow_forwardFor 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.arrow_forward
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