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CHOWS FINALS > CHOWS UNIT 1 > Flashcards

CHOWS UNIT 1 Flashcards

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1
Q

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

A

LATENT

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2
Q

PSIA AT SEA LEVEL UNDER STANDARD CONDITIONS IS

A

14.696 PSIA

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3
Q

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

A

FAHRENHEIT AND CELSIUS

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4
Q

THE FAHRENHEIT ABSOLUTE SCALE IS CALLED THE _______ SCALE

A

RANKINE

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5
Q

ATMOSPHERE PRESSURE IN INCHES OF MERCURY (Hg) DECREASES _________ PER 1000 FT. IN ELEVATION

A

1” Hg

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6
Q

A GAUGE THAT READS 0 PSI WHEN OPENED TO THE ATMOSPHERE ARE KNOWN AS __________ GAUGES

A

COMPUND

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7
Q

THE CELSIUS ABSOLUTE SCALE IS CALLED THE ___________ SCALE

A

KELVIN

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8
Q

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

A

14.696

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9
Q

HEATING THE VAPOR TEMPERATURE ABOVE THE BOILING POINT IS CALLED

A

SUPERHEAT

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10
Q

HEAT THAT CHANGES THE TEMPERATURE OF A SUBSTANCE IS CALLED _________ HEAT

A

SENSIBLE

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11
Q

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

A

A MERCURY BAROMETER UTILIZES MERCURY IN A GLASS TUBE TO MEASURE ATMOSPHERIC PRESSURE

A ANEROID BAROMETER UTILIZES AIR THROUGH A SEALED METAL BELLOW TO MEASURE ATMOSPHERIC PRESSURE

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12
Q

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

A

10 GALLONS PER MINUTE = 83.3 GAL/MIN
83.3 LBS x 15°F = 1,249.5 BTU/MIN
1,249.5 BTU/MIN X 60 MINS = 74,970 BTU/HR

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13
Q

DEFINE CONDUCTION OF HEAT

A

CONDUCTION OF HEAT IS THE PROCESS OF HEAT TRANSFER THROUGH DIRECT CONTACT BETWEEN MATERIALS.

EX. COLD PIECE OF BREAD GETTING HEATED IN A TOASTER

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14
Q

DEFINE RADIATION OF HEAT

A

RADIATION OF HEAT is heat transfer through UV RAYS SUCH AS HEAT FELT FROM THE SUN

EX. HEAT FELT FROM THE SUN
FOOD HEATED FROM A MICROWAVE

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15
Q

DEFINE A BTU

A

BTU STANDS FOR “BRITISH THERMAL UNIT”.
BTU IS A UNIT OF MEASUREMENT USED TO CALCULATE HEAT ENERGY.
IT IS DEFINED AS THE AMOUNT OF HEAT REQUIRED TO RAISE THE TEMPERATURE OF ONE POUND OF WATER BY ONE DEGREE FAHRENHEIT AT A CONSTANT PRESSURE.

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16
Q

DEFINE CONVECTION OF HEAT

A

CONVECTION OF HEAT IS THE TRANSFER OF heat THROUGH THE MOVENT OF FLUIDS (LIQUID OR GAS).

EX. BOILING WATER

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17
Q

MATCH THE TEMPERATURE IN DEGREES FAHRENHEIT WITH THE CORRECT EQUIVALENT CELSIUS TEMPERATURE

A

A. 35C-95F
B. -10C-14F
C. 200C-392F
D. 80C-176F
E. 15C-59F
F. 50C-392F

F= (C X 1.8) + 32
C= (F - 32) / 1.8

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18
Q

MATCH THE TEMPERATURE IN DEGREES CELSIUS WITH THE CORRECT EQUIVALENT FAHRENHEIT TEMPERATURE.

A

A. 32F- 0C
B. 1.4F- -17C
C. 212F- 100C
D. 50F- 10C
E. -49F- ? (SHOULD BE -45C)
F. 77F- 25C

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19
Q

MATCH THE PRESSURES IN PSIA TO THE CORRECT EQUIVALENT. (USE 15 AS TRHE CONVERSION BETWEEN PSIA AND PSIG)

A

A. 5 PSIG - 20 PSIA
B. 6 “ Hg Vac - 8 PSIA
C. 70 PSIG - 85 PSIA
D. 10 PSIG - 25 PSIA
E. 5” Hg Vac - 10 PSIA
F. 14” Hg Vac - 0 PSIA

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20
Q

HOW MANY BTUS ARE REQUIRED TO CHANGE ONE POUND OF ICE AT 20F TO STEAM AS 220F?

A

1,304 BTU/H

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21
Q

THE STANDARD ATMOSPHERIC PRESSURE AT SEA LEVEL IS

A

14.696 psia / 29.92 “Hg

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22
Q

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

A

475 KELVIN

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23
Q

HOW MANY BTUS ARE REQUIRED TO CHANGE FIVE POUNDS OF ICE AT 20F TO STEAM AT 220F?

24
Q

TEMPERATURE CAN BE THOUGHT OF AS

Study These Flashcards
A

A DESCRIPTION OF THE LEVEL OF HEAT

25
PURE WATER BOILS AT A TEMPERATURE OF 212F AT WHICH OF THE FOLLOWING STANDARD CONDITIONS?
14.696 PSI
26
AS THE TEMPERATURE OF A MATERIAL INCREASES, THE MOLECULES IN THE MATERIAL…..
TRAVEL FASTER
27
HOW MANY BTUS MUST BE REMOVED FROM ONE POUND OF WATER AT 200F FOR IT TO END UP AS ICE AT 30F?
313 BTU
28
THE TEMPERATURE ON THE CELSIUS SCALE WHERE ALL MOLECULAR ACTIVITY STOPS IS….
-273C
29
THE AMOUNT OF HEAT NEEDED TO CHANGE THE TEMPERATURE OF A SUNSTANCE WILL VARY WITH THE TYPE OF SUBSTANCE. THIS HEAT QUALITY IS CALLED THE ________ OF THE SUBSTANCE.
SPECIFIC HEAT
30
THE TEMPERATURE ON THE FAHRENHEIT SCALE WHERE ALL MOLECULAR BIOLOGY ACTIVITY STOPS IS_____
-460F
31
THE CELSIUS EQUIVALENT OF 80F IS ______
26.7C
32
AT STANDARD CONDITIONS ON THE CELSIUS SCALE, WATER WILL BOIL AT _____
100C
33
OF THE FOLLOWING CHOICES, THE WARMEST TEMPERATURE IS _____
303 KELVIN
34
PSIG INDICATES _______
POUNDS PER SQUARE INCH ABSOLUTE GAUGE
35
A BOURDON TUBE IS OFTEN FOUND IN A(N) _____
PRESSURE GAUGE
36
T/F THE DIFFERENCE IN THE LEVEL OF HEAT BETWEEN TWO SUBSTANCES WILL DETERMINE THE HEAT TRANSFER RATE BETWEEN THE SUBSTANCES.
TRUE
37
THE DIFFERENCE IN THE VOLUME OF A SUBSTANCE WILL DETERMINE THE HEAT TRANSFER RATE BETWEEN THE SUBSTANCE
FALSE
38
WHEN WATER AT 212F BOILS, IT IS ONLY ABSORBING LATENT HEAT
TRUE
39
WATER AT 0F HAS NO HEAT ENERGY OR MOLECULAR ACTIVITY
FALSE
40
TEMPERATURE DIFFERENCE DOES NOT AFFECT HEAT TRANSFER RATE
FALSE
41
THE FAHRENHEIT SCALE IS USED IN THE ENGLISH MEASUREMENT SYSTEM BY THE UNITED STATES
TRUE
42
IN ORDER FOR WATER AT 60F TO BOIL, IT MUST ABSORB BOTH SENSIBLE AND LATENT HEAT
TRUE
43
WATER BOILS AT 212C
FALSE
44
THE LAWS OF THERMODYNAMICS CAN HELP US TO UNDERSTAND WHAT HEAT IS ALL ABOUT
TRUE
45
BOTH SENSIBLE AND LATENT HEAT TRANSFERS CAN BE READ WITH A THERMOMETER
FALSE
46
IN WHAT DIRECTION DOES HEAT FLOW?
HEAT FLOWS FROM HOT TO COLD. HOTTER TEMPERATURE TO A COOLER TEMPERATURE
47
WHAT COMPANY PRODUCED A COMPRESSOR THAT WAS PRACTICALLY NOISELESS? IT HAD NO SEALS AND INTERNAL MOVING PARTS. ONLY A MERCURY COLUMN COMPRESSED THE REFRIGERANT GAS AS THE ENTIRE UNIT ROTATED.
SAVAGE ARMS COMPANY
48
IN 1939 WHAT COMPRESSOR COMPANY INTRODUCED THE FIRST SUCCESSFUL SEMI HERMETIC FIELD SERVICEABLE COMPRESSOR?
COPELAND
49
THE ANCIENT PEOPLE OF _________ COOLED LIQUIDS IN POROUS EARTHEN JARS. THESE JARS WERE SET OUT IN THE DRY NIGHT AIR. AND THE EVAPORATION FROM THE LIQUID SEEPING THRU THE POROUS WALLS PROVIDING COOLING.
EGYPT
50
THE _______ WERE THE FIRST TO STORE NATURAL ICE AND SNOW TO COOL WINE AND OTHER DELICACIES.
CHINESE
51
THE TEMPERATUE SET POINT FOR AN OFFICE SHOULD BE AT…
73F
52
TO BE IN APPLIANCE WITH HAWAII’S DEPARTMENT OF HEALTH REGULATIONS, WHAT SHOULD THE TEMPERATURE OF A CHILL BOX BE?
35F-39F
53
WHAT ARE THE TWO VENTS CALLED THAT IS IN AN OFFICE AC SYSTEM?
SUPPLY AND RETURN
54
WHO IS WILLIS CARRIER AND WHY IS HE IMPORTANT?
WILLIS CARRIER IS CREDITED AS BEING THE “FATHER OF AIR CONDITIONING” AD CREATOR OF THE PSYCHOMETRIC CHART THAT IS UTILIZED IN HVAC TO THIS DAY.
55
NAME SOME GOOD COMMUNICATION SKILLS USED WITH CUSTOMERS
ACTIVE LISTENING CLEAR AND SIMPLE LANGUAGE EYE CONTACT SHOW AND EXPLAIN ALL THE WORK THAT WAS DONE AND WHY

CHOWS FINALS (8 decks)

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