Which of the following is a correct statement?
a. Insulation accelerates the flow of heat.
b. Heat flows from a lower temperature to a higher temperature.
c. The greater the temperature difference, the greater the quantity of heat transfer.
d. Metals are poor conductors of heat.
c. The greater the temperature difference, the greater the quantity of heat transfer.
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When handling jobsite material, always move material with the least expensive labor possible.
Answer the following statement true (T) or false (F)
The packaged unit accessory used to prevent compressor oil from absorbing refrigerant is a(n) _____
a. economizer b. crankcase heater c. oil defroster d. outdoor thermostat
Which of the following statements is true?
A. The change in internal energy of an ideal gas can be calculated using the equation dU = CPdT, even if the pressure of the gas isn’t constant. B. The change in enthalpy of a supercritical fluid can be calculated using the equation dH = CPdT, even if the pressure of the fluid isn’t constant. C. The expression CP = CV + R was derived for ideal gases, but is frequently applied to liquids and solids as well. D. The properties tabulated in the steam tables are all state properties, but none of them are extensive properties. E. WEC = -PV, so U - WEC is equal to H.
What are the advantages of backward curved air foil centrifugal fan blades?
A) The air foil shaped blades result in less turbulence and noise B) Fans with backward curved blades generally operate at lower RPMs C) The air foil shaped blades are less expensive D) backward curved centrifugal fans are well suited for small airflow quantities