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Fundamentals Of Refrigeration > Midterm Review > Flashcards

Midterm Review Flashcards

1
Q

Heat flows quicker between two objects when they have ________

A

Greater Temperature Difference

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2
Q

HVAC Techs work with what type of energy?

A

Thermodynamics

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3
Q

Heat flows from _________ to _________

A

Hot to Cold

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4
Q

1st Law of Thermodynamics states what?

A

Energy can not be created or destroyed

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5
Q

Thermodynamics is the science of …..

A

Heat and Energy Movement

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6
Q

Heat transfer between closely packed molecules is called?

A

Conduction

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7
Q

Metals used in the HVAC field have ________ conductivity

A

Thermal

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8
Q

Adding fins to the tubing in a Coil ________ the heat transfer rate.

A

Increase

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9
Q

Twice the surface area, _________ the heat transfer

A

Twice

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10
Q

Heat transfer through a flowing medium is called _____________

A

Convection

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11
Q

Passive systems _______ rely on mechanical means to increase heat transfer

A. Do

B. Do not

A

B. Do not

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12
Q

Forced Convection systems _____ rely on mechanical means to move a molecule to increase heat transfer

A. Do

B. Do not

A

A. Do

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13
Q

Active systems use ________ and _________ to increase heat transfer through convection

A

Fans and Pumps

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14
Q

Waveforms are how __________ heat transfer work

A

Radiant

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15
Q

A measurable change in temperature is called ____________ heat

A

Sensible

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16
Q

Objects are heated by this type of energy

A

Radiant

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17
Q

To calculate the specific rise in temperature of a material, techs use the ___________ ___________ capacity

A

Specific Heat

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18
Q

Changing the state of refrigerant, either gas to a liquid, or liquid to gas, or liquid to ice, or ice to liquid uses __________ heat

A

Latent

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19
Q

Which takes more heat, Latent or Sensible change?

A

Latent

20
Q

To transfer heat, you need a heat source and a __________

A

Heat sink

21
Q

The official definition of saturation is?

A

When liquid and vapor are present at the same time

22
Q

To cause some gas is to condense to a liquid, we need to ________ heat

A

Reject

23
Q

20 lbs of saturated refrigerant has the same, less, or greater pressure as 5 lbs of saturated refrigerant, at the same temperature

A

Same

24
Q

The pressure of a refrigerant controls the ____________________ of that refrigerant

A

Saturation Temperature

25
Q

If you increase the temperature of a saturated refrigerant, the pressure will

A

Increase

26
Q

If you increase the pressure of a century the refrigerant, the temperature will ___________

A

Increase

27
Q

Adding heat to a refrigerant gas is called _____________

A

Superheat

28
Q

Removing heat from a liquid refrigerant is called ____________

A

Subcool

29
Q

Pressure is expressed as ____________

A

Weight

30
Q

Manometers measure ?

A

Pressure

31
Q

Manifold gauges measure pressure compare to _________________

A

Atmospheric pressure

32
Q

What does Saturation mean?

A

Completely Full

33
Q

Mercury columns measure

A

Vacuum

34
Q

Water columns measure

A

Lower Pressure

35
Q

What is atmospheric pressure at sea level?

A

14.7 psia

36
Q

High pressure gauges measure pressure ___________ atmospheric pressure

A

Above

37
Q

Low side (compound) gauges measure pressure ____________ and ___________ atmospheric pressure

A

Above and Below

38
Q

Absolute pressure is stated in

A

PSIA

39
Q

Vacuum is any pressure ____________ atmospheric pressure

A

Below

40
Q

A perfect vacuumed using absolute measurements is _________ “ HG Absolute

A

0

41
Q

To cause some liquid to change to a gas, we need to __________ heat

A

Add Latent Heat

42
Q

Barometric pressure is the same as ?

A

Atmospheric Pressure

43
Q

High temperature and high relative humidity both produce?

A

Low atmospheric pressure

44
Q

How do you convert psia to psig?

A

Pressure - 15 = psig

45
Q

How do you convert psig to psia?

A

Pressure +15= psia

Fundamentals Of Refrigeration (4 decks)

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