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MIDTERM UNITS 1-8 > Unit 1 > Flashcards

Unit 1 Flashcards

1
Q

Convert 150°F to Celsius

A

65.56 C

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2
Q

0 C converted into Fahrenheit

A

32 F

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3
Q

-30 C converted into Fahrenheit

A

-22 F

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4
Q

350 C converted into Fahrenheit

A

662 F

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5
Q

Which temperature is the hottest?
A. 600R
B. -20C
C. 150F
D. 380k

A

D. 380K

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6
Q

-400 F converted into Celsius

A

-240 C

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7
Q

True or False

Latent heat is also known as hidden heat because it can’t be measured.

A

True

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8
Q

True or false
The Uninsulated portion of the suction line should be warm and dry.

A

False it should be cold and sweaty

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9
Q

True or false
Specific heat is the amount of heat necessary to raise the temperature of one pound of water 1 F.

A

False (1lb of any substance)

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10
Q

True or false
As you gain elevation/altitude, atmospheric pressure decreases.

A

True

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11
Q

True or false
A compound pressure gauge reads pressure above and below atmospheric pressure.

A

True

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12
Q

True or false
System superheat is measured by placing a thermocouple on the suction line right before it enters the compressor.

A

True

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13
Q

True or false
The instrument that measures atmospheric pressure is called the Bourdon tube.

A

False

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14
Q

True or false
Pressure is defined as force per unit of area

A

True

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15
Q

True or false
When water at 212 F boils, it is only absorbing latent heat.

A

True

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16
Q

The two common temperature scales used by air conditioning and refrigeration technicians are called _______ and _________

A
  1. Fahrenheit scale
  2. Celsius scale
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17
Q

Heat that changes the temperature of a substance is called ________ heat.

A

Sensible

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18
Q

Convert psig to psia
325 psig

A

339.70 psia

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19
Q

Convert psia into psig
235 psia

A

220.304 psig

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20
Q

Convert inches of HG (mercury) vacuum to psia
15 in HG

A

7.5 psia

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21
Q

Convert HG to psia
6in HG

A

12 psia

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22
Q

Gauge that can read pressures above and below atmospheric pressure.

A

Compound gauge

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23
Q

Energy traveling from one molecule to another within a substance.

A

Conduction

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24
Q

Instrument used to measure atmospheric pressure.

A

Barometer

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25
Q

Absolute scale of Fahrenheit.

A

Rankine scale

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26
Q

Level of heat.

A

Temperature

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27
Q

14.696 psi at sea level.

A

Standard condition

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28
Q

Gaseous state of a substance.

A

Vapor

29
Q

Movement of molecules within a substance.

A

Molecular motion

30
Q

Amount of energy required to change a substance into a vapor.

A

Latent heat of vaporization

31
Q

As the temperature of a material increases, the molecules in the material _______.
A. Stop moving
B. Travel faster
C. Slow down
D. Travel in more of a parallel direction

A

B. Travel faster

32
Q

True or false
Silicone elastomers, used in seals and gaskets, are not compatible with HFO refrigerants.

A

True

33
Q

What should be used to remove ice from sight glasses or viewing glasses?

A

Alcohol Spray

34
Q

Persons who maintain, service, repair or dispose of appliances containing more than 5 lbs of refrigerant, or if the installation of such equipment requires refrigerant charging, must be certified as Type ____ technicians.

A

Type 2

35
Q

De-superheating takes place in what basic component of the refrigeration system?

A

Condenser

36
Q

In order for a pound of 60 F water to boil, how many btus of heat must be added to it?

A

152BTUs

37
Q

What do the inner rings of numbers and different colors of an analog manifold gauge indicate?

A

Outter ring = Pressure
Colors = Refrigerants
Numbers = Temperature

38
Q

IN __________ HEAT OR HIDDEN HEAT, HEAT IS KNOWN TO BE ADDED, BUT NO TEMPERATURE RISE IS NOTICED.

A

LATENT

39
Q

IN __________ HEAT OR HIDDEN HEAT, HEAT IS KNOWN TO BE ADDED, BUT NO TEMPERATURE RISE IS NOTICED.

A

LATENT

40
Q

PSIA AT SEA LEVEL UNDER STANDARD CONDITIONS IS ________________________

A

14.696 PSIA OR 29.92 IN. Hg

41
Q

THE TWO COMMON TEMPERATURE SCALES USED BY AIR CONDITIONING AND REFRIGERATION TECHNICIANS ARE CALLED

A

FAHRENHEIT AND CELSIUS

42
Q

THE FAHRENHEIT ABSOLUTE SCALE IS CALLED THE

A

RANKINE SCALE

43
Q

ATMOSPHERIC PRESSURE IN INCHES OF MERCURY (Hg) DECREASES ___________ PER 1000 FT INCREASE

A

1 IN. Hg

44
Q

A GAUGE THAT READS 0 PSI WHEN OPENED IN THE ATMOSPHERE ARE KNOWN AS ________________ GAUGE

A

COMPOUND GAUGE OR HIGH SIDE GAUGE

45
Q

THE CELSIUS ABSOLUTE SCALE IS CALLED THE ___________ SCALE.

A

KELVIN

46
Q

THE WEIGHT OF A COLUMN OF AIR AT SEA LEVEL AT STANDARD CONDITIONS IS

A

14.696

47
Q

HEATING THE VAPOR TEMPERATURE ABOVE THE BOILING POINT IS CALLED

A

LATENT HEAT OF VAPORIZATION OR SUPERHEAT

48
Q

HEAT THAT CHANGES THE TEMPERATURE OF A SUBSTANCE IS CALLED

A

SPECIFIC HEAT

49
Q

WHAT IS THE DIFFERENCE BETWEEN A MERCURY BAROMETER AND AN ANEROID BAROMETER?

A

MERCURY BAROMETER USES MERCURY TO MEASURE ATMOSPHERIC PRESSURE

ANEROID BAROMETER USES AIR TO MEASURE ATMOSPHERIC PRESSURE

50
Q

HOW MANY BTUS OF HEAT ARE REMOVED PER HOUR WHEN THE WATER AT A FLOW RATE OF 10 GALLONS PER MINUTE IS COOLED 15F? (WATER WEIGHS 8.33 LBS. PER GALLON)

A

74,970 BTU/HR

51
Q

DEFINE CONDUCTION OF HEAT

A

HEAT TRANSFER BETWEEN MOLECULES THROUGH DIRECT CONTACT

52
Q

DEFINE RADIATION OF HEAT

A

THE TRANSFER OF THERMAL ENERGY THROUGH ELECTROMAGNETIC WAVES

53
Q

HOW MANY BTUS ARE REQUIRED TO CHANGE ONE POUND OF ICE AT 20°F to steam at 220°F

A

1,304 BTUS/H

54
Q

THE STANDARD ATMOSPHERIC PRESSURE AT SEA LEVEL IS

A

29.92 “ Hg

55
Q

WHICH OF THE FOLLOWING REPRESENTS A DIFFERENT TEMPERATURE THAN THE OTHER THREE?

A

15 DEGREES CELSIUS

56
Q

HOW MANY BTUs ARE REQUIRED TO CHANGE 5 POUNDS OF ICE AT 20F TO STEAM AT 220F?

A

6,520 BTU/H

57
Q

TEMPERATURE CAN BE THOUGHT OF AS

A

DESCRIPTION OF THE LEVEL OF HEAT

58
Q

PURE WATER BOILS AT A TEMPERATURE OF 212F AT WHICH OF THE FOLLOWING IS STANDARD CONDITIONS?

A

14.696 PSI

59
Q

AS THE TEMPERATURE OF A MATERIAL INCREASES, THE MOLECULES IN THE MATERIAL

A

TRAVEL FASTER

60
Q

HOW MANY BTUs MUST BE REMOVED FROM ONE POUND OF WATER AT 200F FOR IT TO END UP AS ICE AT 30F?

A

313 BTU

61
Q

THE TEMPERATURE ON THE CELSIUS SCALE WHERE ALL MOLECULAR ACTIVITY STOPS IS

A

-273C

62
Q

THE AMOUNT OF HEAT NEEDED TO CHANGE THE TEMPERATURE OF A SUBSTANCE WILL VARY WITH THE TYPE OF SUBSTANCE. THIS HEAT QUALITY IS CALLED THE _________ OF THE SUBSTANCE.

A

SPECIFIC HEAT

63
Q

THE TEMPERATURE OF THE FAHRENHEIT SCALE WHERE ALL MOLECULAR BIOLOGY ACTIVITY STOPS IS

A

-460F

64
Q

THE CELSIUS EQUIVALENT OF 80F IS

A

26.7C

65
Q

AT STANDARD CONDITIONS ON THE CELSIUS SCALE, WATER WILL BOIL AT

A

100C

66
Q

OF THE FOLLOWING CHOICES, THE WARMEST TEMPERATURE IS

A

303K

67
Q

PSIG INDICATES

A

POUNDS PER SQUARE INCH GAUGE

68
Q

A BOURDON TUBE IS OFTEN FOUND IN A(N)

A

PRESSURE GAUGE

MIDTERM UNITS 1-8 (8 decks)

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