Lab Manual for Smith's Electricity for Refrigeration, Heating, and Air Conditioning, 9th
9th Edition
ISBN: 9781285180014
Author: Russell E. Smith
Publisher: Cengage Learning
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Chapter 9, Problem 30RQ
To determine
The correct choice for the advantage of using three phase motor.
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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:
7. Who among the following got a patent for an induction motor in 1888?
A. Newton
B. Torilcelli
C. Nichola Tesla
D. Thomas Edison
26. Explain the principles of DC motors, including the DC permanent magnet motor and how it can
have speed control. (10 marks)
Chapter 9 Solutions
Lab Manual for Smith's Electricity for Refrigeration, Heating, and Air Conditioning, 9th
Ch. 9 - What is magnetism?
Ch. 9 - How is an electromagnet produced?
Ch. 9 - Which of the following correctly lists the motor’s...Ch. 9 - Prob. 14RQCh. 9 - Prob. 15RQCh. 9 - Prob. 16RQCh. 9 - Prob. 17RQCh. 9 - Prob. 18RQCh. 9 - Prob. 19RQCh. 9 - Prob. 20RQ
Ch. 9 - Prob. 21RQCh. 9 - What is the unit of measurement for the strength...Ch. 9 - Prob. 23RQCh. 9 - Prob. 24RQCh. 9 - List the five capacitor replacement rules.
Ch. 9 - Prob. 26RQCh. 9 - Prob. 27RQCh. 9 - What are the advantages and disadvantages of using...Ch. 9 - Prob. 29RQCh. 9 - Prob. 30RQCh. 9 - Prob. 31RQCh. 9 - True or False: All starting apparatuses are...Ch. 9 - Prob. 33RQCh. 9 - Which of the following is the capacitance of an...Ch. 9 - Which of the following is the capacitance of two...Ch. 9 - If a capacitor produces 15 ampere on a 240-volt...Ch. 9 - Which of the following capacitors could be used to...Ch. 9 - Which of the following capacitors could be used to...Ch. 9 - Which of the following capacitors or combination...Ch. 9 - Which of the following capacitors or combination...Ch. 9 - Find the common, start, and run terminals of the...Ch. 9 - Briefly explain the procedure for troubleshooting...Ch. 9 - What are the electrical failure categories for...Ch. 9 - What precautions should be taken when checking...Ch. 9 - Prob. 45RQCh. 9 - Prob. 46RQCh. 9 - Explain the construction of an ECM.
Ch. 9 - An ECM is a __________.
three-phase, AC...Ch. 9 - True or False: The resistance readings of the...Ch. 9 - True or False: The line voltage power supply of an...
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- What type of single-phase motor develops the highest starting torque?arrow_forwardWhen a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forwardName three factors that determine the amount of torque developed by a wound rotor induction motor.arrow_forward
- Describe a washer machine motor you have experience with. What is it being used for, what power source it uses, and possibly it’s configuration. Explain why you picked this motor and if you have/need to perform(ed) any maintenance on it.arrow_forwardName three factors that determine the amount of voltage induced in the rotor of a wound-rotor motor.arrow_forwardWhich of the following is a symbol of an air motor in one direction with invariable capacity isarrow_forward
- The reason why the starting torque of a series motor is higher than a shunt motor is because the series motor has O more current flowing through its armature O a stronger net magnetic field around both coils during the inrush of stator currentarrow_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_forwardA motor is operating a load that requires a torque of 750 lb–in and is turning at a speed of 1,575 RPM. How much horsepower is the motor producing?arrow_forward
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