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单选题
The heat identified by only a change in temperature is known as （）.
A
sensible heat
B
latent heat
C
total heat
D
residual heat
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单选题The sum of the sensible heat and the latent heat of any substance is known as （）.A
total heatB
residual heatC
specific heatD
superheat
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单选题Since heat will not flow freely from a body at a （） temperature to another at a （） temperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.A
lower；higherB
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单选题The heat gained per pound of refrigerant in the evaporator is known as the（）.A
latent heat of vaporizationB
sensible heatC
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specific heat of vaporization
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单选题Which of the statements listed concerning heat transfer is correct?（）A
Heat is always transferred at a constant rateB
Heat transfer rate increases as temperature difference increasesC
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单选题Which of the following statements is correct concerning heat transfer?（）A
Heat is given off from a high temperature region known as a heat sinkB
Heat transfer rate is affected most by the size of the heat sink involvedC
Heat transfer rate is affected most by the temperature difference between the heat source and the heat sinkD
Heat transfer by radiation will occur only by mass motion of a fluid substance
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单选题The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of （）.A
fusionB
vaporizationC
condensationD
sublimation
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单选题The heat identified by only a change in temperature is known as （）.A
sensible heatB
latent heatC
total heatD
residual heat
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单选题The heat used to change a liquid to a vapor is called （）.A
latent heat of fusionB
latent heat of vaporizationC
specific heat of vaporizationD
latent heat of the gas
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单选题The amount of heat released by steam when it changes to water at the same temperature is called（）.A
latent heat of condensationB
latent heat of vaporizationC
latent heat of saturationD
sensible heat of condensation
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单选题The component of a refrigerating system in which the refrigerant vaporizes and absorbs heat is known as the （）.A
condenserB
vapor generatorC
accumulatorD
evaporator
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单选题A solenoid valve used in a refrigeration system should be installed （）.A
with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valveB
upright, sensing temperature of the box, and upstream of the thermal expansion valveC
upright, sensing temperature of the box, and downstream of the thermal expansion valveD
upright, sensing heat of the tail coil, and upstream of the thermal expansion valve
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单选题The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of （）.A
fusionB
vaporizationC
sublimationD
condensation
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单选题Reheating a hardening component to a temperature lower than the hardening temperature and then cooling it is known as （）A
low temperature hardeningB
case hardeningC
annealingD
tempering
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单选题In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon（）A
the temperature of the hydraulic fluidB
the flow rate of the hydraulic fluidC
the temperature of the cooling waterD
all of the above
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单选题The degree to which the viscosity of an oil will change with a change in temperature is indicated by the （）.A
weight designationB
viscosity indexC
pour pointD
thermal change value
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单选题Which of the following statements is correct regarding an oil with a high viscosity index?（）A
A large change of viscosity occurs with a minor change in temperatureB
No change in viscosity occurs with any change in temperatureC
Very little change in viscosity occurs with a significant change in temperatureD
The viscosity of the oil increases with an increase in temperature
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