HVAC Thermodynamic Exam Questions
and Answers
first law of thermodynamics - ANSWER-energy cannot be created or destroyed
Heat cannot be "made" but other forms of energy can be ____________. - ANSWER-
converted to heat
second law of thermodynamics states "to cause heat energy to travel, a ____________
must be established and maintained." - ANSWER-temperature difference
Heat from a _____ material will travel to a _____. - ANSWER-higher; lower
how many ways can heat be transferred? - ANSWER-3
what ways can heat be transferred? - ANSWER-conduction, convection, and radiation
_____ is described as transferring heat. - ANSWER-conduction
The rate of heat transfer will vary according to the ability of the material to
____________. - ANSWER-conduct heat
_____ is limited to heat transfer within a liquid or gas. - ANSWER-convection
_____ convection occurs when fluid circulates because of the density changes. -
ANSWER-natural
____________ is the process of moving a fluid using mechanical means to increase
heat transfer. - ANSWER-forced convection
_____ are used to move gases; pumps are used to move _____. - ANSWER-fans;
liquids
the reaction of matter to the addition or deletion of heat is described as a _____
process. - ANSWER-latent
A sensible heat process causes a change in the temperature of a substance but not
____________. - ANSWER-substance change
latent heat refers to a heat transfer that causes a change in state but not a change in
_____. - ANSWER-temperature
heat transfer process requires a heat source to _____ the heat and a heat sink to _____
the heat. - ANSWER-supply; absorb
and Answers
first law of thermodynamics - ANSWER-energy cannot be created or destroyed
Heat cannot be "made" but other forms of energy can be ____________. - ANSWER-
converted to heat
second law of thermodynamics states "to cause heat energy to travel, a ____________
must be established and maintained." - ANSWER-temperature difference
Heat from a _____ material will travel to a _____. - ANSWER-higher; lower
how many ways can heat be transferred? - ANSWER-3
what ways can heat be transferred? - ANSWER-conduction, convection, and radiation
_____ is described as transferring heat. - ANSWER-conduction
The rate of heat transfer will vary according to the ability of the material to
____________. - ANSWER-conduct heat
_____ is limited to heat transfer within a liquid or gas. - ANSWER-convection
_____ convection occurs when fluid circulates because of the density changes. -
ANSWER-natural
____________ is the process of moving a fluid using mechanical means to increase
heat transfer. - ANSWER-forced convection
_____ are used to move gases; pumps are used to move _____. - ANSWER-fans;
liquids
the reaction of matter to the addition or deletion of heat is described as a _____
process. - ANSWER-latent
A sensible heat process causes a change in the temperature of a substance but not
____________. - ANSWER-substance change
latent heat refers to a heat transfer that causes a change in state but not a change in
_____. - ANSWER-temperature
heat transfer process requires a heat source to _____ the heat and a heat sink to _____
the heat. - ANSWER-supply; absorb
