Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN: 9781337399128
Author: Russell E. Smith
Publisher: Cengage Learning
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Chapter 8, Problem 19RQ
To determine
The way in which the split phase motor develop enough torque to begin rotation.
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Name three factors that determine the torque produced by an induction motor.
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:
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(c) Hair driers and desk fans:
(d) Air Conditioner Fan:
(e) XY plotters and printers:
(f) Electric clock:
Name three factors that determine the amount of voltage induced in the rotor of a wound-rotor motor.
Chapter 8 Solutions
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Ch. 8 - What is magnetism?
Ch. 8 - How is an electromagnet produced?
Ch. 8 - Which of the following correctly lists the motor’s...Ch. 8 - Prob. 14RQCh. 8 - Prob. 15RQCh. 8 - Prob. 16RQCh. 8 - Prob. 17RQCh. 8 - Prob. 18RQCh. 8 - Prob. 19RQCh. 8 - Prob. 20RQ
Ch. 8 - Prob. 21RQCh. 8 - What is the unit of measurement for the strength...Ch. 8 - Prob. 23RQCh. 8 - Prob. 24RQCh. 8 - List the five capacitor replacement rules.
Ch. 8 - Prob. 26RQCh. 8 - Prob. 27RQCh. 8 - What are the advantages and disadvantages of using...Ch. 8 - Prob. 29RQCh. 8 - Prob. 30RQCh. 8 - Prob. 31RQCh. 8 - True or False: All starting apparatuses are...Ch. 8 - Prob. 33RQCh. 8 - Which of the following is the capacitance of an...Ch. 8 - Which of the following is the capacitance of two...Ch. 8 - If a capacitor produces 15 ampere on a 240-volt...Ch. 8 - Which of the following capacitors could be used to...Ch. 8 - Which of the following capacitors could be used to...Ch. 8 - Which of the following capacitors or combination...Ch. 8 - Which of the following capacitors or combination...Ch. 8 - Find the common, start, and run terminals of the...Ch. 8 - Briefly explain the procedure for troubleshooting...Ch. 8 - What are the electrical failure categories for...Ch. 8 - What precautions should be taken when checking...Ch. 8 - True or False: The control module determines the...Ch. 8 - Explain the operation of the direct current motor...Ch. 8 - Prob. 47RQCh. 8 - Prob. 48RQCh. 8 - Explain the construction of an ECM.
Ch. 8 - An ECM is a __________.
three-phase, AC...Ch. 8 - True or False: The resistance readings of the...Ch. 8 - True or False: The line voltage power supply of an...
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- When 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_forwardWhat type of commutator is used with a brush-lifting repulsion-start induction-run motor?arrow_forward
- What is the most common NEMA design code found on squirrel- cagetype motors?arrow_forwardA 50 Hz pump drive requires a torque of 70 Nm approx. at 1450 rpm approx. for 1 minute followed by 5 minutes running unloaded. This cyclic pattern is repeated continuously. The motor is to be selected from a range of general-purpose motors with continuous ratings of 2.2, 3, 4, 5.5, 7.5, 11, 15 and 20 kW. The motors have a pull-out torque of 200%. 1. Select the pole number. 2. Calculate the continuous power rating. 3. 4. Calculate the required power rating given the pull out torque rating. Estimate the slip when the motor drives the pump at the required speed. Choose the motor from the range of options that is most fit for purpose. 5. Enter your answers in the units indicated (without unit symbols) corrected if necessary to two decimal places. Answer: Number of poles= ✓ Continuous power rating (kW)= Required power rating for 200% pull out torque (kW)= Percentage slip (%) = Most suitable motor from given range (kW)-arrow_forwardThe 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_forward
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