Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 17, Problem 15RQ
What type of chemical is used to cause a pressure change in a bellows type thermostat?
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Why is a low-voltage thermostat normally more accuratethan a high-voltage thermostat?
If the thermostat contacts are closed the compressor and the condenser fan motor are not operating, and all the other loads are operating properly, which might be the problem?
A. A bad high pressure safety switch.
B. A bad low pressure switch
C. Both A. and B.
D. A bad thermostat
Identify the various elements that might be present in a control system involving a thermostatically controlled electric heater.
Chapter 17 Solutions
Understanding Motor Controls
Ch. 17 - Should a metal bar be heated or cooled to make it...Ch. 17 - What type of metal remains in a liquid state at...Ch. 17 - How is a bimetal strip made?Ch. 17 - Why are bimetal strips often formed into a spiral...Ch. 17 - Why should electrical contacts never be permitted...Ch. 17 - What two factors determine the amount of voltage...Ch. 17 - What is a thermopile?Ch. 17 - What do the letters RTD stand for?
Ch. 17 - What type of wire is used to make an RTD?Ch. 17 - What material is a thermistor made of?
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- Three common controls used in central electric heat applications are thermostats, contactors (or relays), and A. capacitors. B. sequencers. C. cool anticipators.arrow_forwardWhat two types of switches are normally found in the subbase of a low-voltage thermostat?arrow_forwardWhat type of pressure switch is generally used to sense small changes in low pressure systems?arrow_forward
- A disadvantage of a central forced-air electric furnace is that A. there is no zone control for individual rooms. B. a thermostat must be installed in each room. C. only line-voltage thermostats can be used. D. it is difficult to add air-conditioning (cooling)arrow_forwardWhich of the following is a gas charged accumulator? a. spring loaded accumulator b. bladder type c. all of the mentioned d. weighted accumulatorarrow_forwardTrue or False: The two types of defrosts used with low-temperature fixtures are hot gas and electric defrost.arrow_forward
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