Electricity for Refrigeration, Heating, and Air Conditioning
9th Edition
ISBN: 9781285179988
Author: Russell E. Smith
Publisher: Cengage Learning
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Textbook Question
Chapter 2, Problem 25RQ
Which of the following is the best insulator?
- a. wood
- b. thermoplastic
- c. copper
- d. cast iron
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Thermosetting plastic materials have the cost saving advantage in that they can be injection molded and therefore have faster cycling times and thermal plastic materials that can only be compression molding. True or false.
Which of the following is a thermosetting polymer?
polyester
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nylon
poly propylene
Answer Q1 and Q2 (thermofluids)
Chapter 2 Solutions
Electricity for Refrigeration, Heating, and Air Conditioning
Ch. 2 - All physical objects are composed of __________....Ch. 2 - What is an atom?Ch. 2 - Which of the following is a part of the atom? a....Ch. 2 - What is static electricity?Ch. 2 - Name three ways electricity can be produced.Ch. 2 - What part do protons and electrons play in the...Ch. 2 - Which of the following is the simplest atom that...Ch. 2 - What are the four most important characteristics...Ch. 2 - What is electromotive force?Ch. 2 - Electromotive force is commonly measured in _____....
Ch. 2 - What is current?Ch. 2 - How is current measured? a. amperes b. ohms c....Ch. 2 - What is resistance?Ch. 2 - How is resistance commonly measured? a. amperes b....Ch. 2 - What is electrical power?Ch. 2 - How is electrical power commonly measured? a....Ch. 2 - Where do electrons exist in an atom, and what is...Ch. 2 - True or False: All atoms tend to lose electrons.Ch. 2 - State the law of electric charges.Ch. 2 - What is a proton? Where does it normally exist in...Ch. 2 - Describe briefly the method a dry cell battery...Ch. 2 - What is a conductor?Ch. 2 - Which of the following is the best conductor? a....Ch. 2 - What is an insulator?Ch. 2 - Which of the following is the best insulator? a....Ch. 2 - Why do metals make the best conductors?Ch. 2 - How do electric utility companies charge customers...Ch. 2 - What is the meaning of SEER when used in...Ch. 2 - State Ohms law.Ch. 2 - True or False: Ohms law applies to all types of...Ch. 2 - What is the ampere draw of a 5000-watt electric...Ch. 2 - What is the resistance of the heating element of...Ch. 2 - What is the voltage of a small electric heater if...Ch. 2 - What is the Btu/hour output of an electric heater...Ch. 2 - What is the kilowatt output of an electric heater...
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- Q3. Hydrocarbon characterized by a straight chain with one or more نقطة واحدة :double bonded carbon atoms is classified as Isoparaffinsl Normal Paraffins Olefins Naphthenesarrow_forwardThermoplastic polymers transform into a rigid structure on cooling from a heated plastic condition. True or Falsearrow_forwardOther than wood nonferrous engineering materials can be divided into four categories they are polymers elastomers ceramics and glass and composites. True or false.arrow_forward
- Choose 4 of the following locations that describe where asbestos can be found. (CHOOSE FOUR) 1) Rigging hardware 2) 0Sprayed-on fire-proofi 3) 0Furnace and boiler insulation 4) O Piping insulation 5)OBrake linings and clutch pads 6) 0 Piping insulation in new facilitiesarrow_forwardANSWER THIS THERMOFLUID QUESTIONSarrow_forwardI need help on this thermofluid questionarrow_forward
- Which type of material thermosetting or thermal plastic can be easily injected by pressure into a mold? a thermostat b thermoplastic c all of the above d none of the abovearrow_forwardWhich of the following materials would change temperatures the slowest (under the same conditions)? Air Oil Water None of the abovearrow_forwardThermofluid Engineeringarrow_forward
- 4) Which one of the following material can by recycled a. Polyesters b. epoxides c. PET d. Phenolicarrow_forwardTrue or False? Aluminum alloy has an FCC structure. True or False? Brittle materials typically fail fast and with excessive plastic deformation. True or False? Strain is the measure of force per unit cross-sectional area. True or False? The type of bonding dictates whether a material is electrically conductive or not. True or False? Metallurgy is the study of metals and their behavior. True or False? I like materials science and engineering.arrow_forwardWhat are valid reasons for adding Yttrium to the zirconia in the Thermal Barrier Coating (TBC) in a turbine blade? Select one or more: O a. To match the thermal conductivity of the TBC to the metal substrate b. To avoid breakage during change in thermal conditions O c. To match the thermal conductivity of the TBC to the underlying oxide layer Od. To increase the weight of the TBC O e. To prevent a change of the crystallographic structure as the temperature changesarrow_forward
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