1
Refrigeration Questions with Answers (100%
Correct Answers)
Specific heat of ice Answer: .5
Specific heat of water Answer: 1
Specific heat of steam Answer: .48
how do you change gauge pressure to absolute Answer: add 14.7
Absolute temperature is in what? Answer: Kelvin and Rankin
F to rankin formula Answer: R= F-460
C to Kelvin formula Answer: K= C-273
C to F formula Answer: F=
F to C formula Answer: C=
how many btu in a ton of refrigerant Answer: 12000
how many microns in an inch Answer: 25400
latent heat of ice Answer: 144 BTU
Latent heat of steam Answer: 970 BTU
absolute temperature is measured in? Answer: kelvin
rankin
3 groups of compressors Answer: hermatic
semi hermatic
open
,2
explain open compressor Answer: motor external to system, has to be cooled
by other means
What cools semi hermatic and hermatic compressors? Answer: refrigerant
some need water jacket to help
5 types of compressors Answer: scroll
rotary
screw
centrifugal
reciprocating piston
most common compressor in ac? Answer: scroll
type of compressor that used to be most common and is still most common in
refrigeration Answer: reciprocating piston
which compressor is not positive displacement? Answer: centrifugal
where is 'A' coil normally found? Answer: residential A/C
What is the actual structural design of A coil Answer: copper tube, aluminum
fin
where is a refrigerant always in a condensor Answer: the shell
if you have a shell and tube condenser water will be in the ____ refrigerant in
_____ it will also act as a _____ Answer: tubes
shell
reciever
when is the only time there will be refrigerant in condenser tubes where there is
water Answer: direct expansion
, 3
what 4 condensers can also be evaporators Answer: tube and tube
shell and tube
copper tube with alum. fin
shell coil
all air conditioning in ace building uses what condensor Answer: tube and tube
ground source heat pumps use what type of condensor Answer: tube and tube
where are evaporator condensors commonly found Answer: hockey rink and
any ammonia system
can you use copper on ammonia systems? Answer: no... have to use steel pipe
how does captube and orifice work? Answer: smart valves. critical charge.
charged by superheat
orifice or captube increase discharge pressure does the suction pressure go up or
down? Answer: up
TX valve, what does it control? Answer: superheat controls with spring
automatic expansion if you increase spring pressure what happens? Answer: it
opens
where do you normally find automatic expansion valves? Answer: SMALL
SYstems with constant load
What is the compression ratio formula Answer: Compression ratio = Absolute
discharge pressure/Absolute suction pressure
456 psig disharge and 190 suction what the compression ratio Answer: add 14.7
round 15 to 456 psog to get 471 psia suction 205
ratio = 2.3 to 1
Refrigeration Questions with Answers (100%
Correct Answers)
Specific heat of ice Answer: .5
Specific heat of water Answer: 1
Specific heat of steam Answer: .48
how do you change gauge pressure to absolute Answer: add 14.7
Absolute temperature is in what? Answer: Kelvin and Rankin
F to rankin formula Answer: R= F-460
C to Kelvin formula Answer: K= C-273
C to F formula Answer: F=
F to C formula Answer: C=
how many btu in a ton of refrigerant Answer: 12000
how many microns in an inch Answer: 25400
latent heat of ice Answer: 144 BTU
Latent heat of steam Answer: 970 BTU
absolute temperature is measured in? Answer: kelvin
rankin
3 groups of compressors Answer: hermatic
semi hermatic
open
,2
explain open compressor Answer: motor external to system, has to be cooled
by other means
What cools semi hermatic and hermatic compressors? Answer: refrigerant
some need water jacket to help
5 types of compressors Answer: scroll
rotary
screw
centrifugal
reciprocating piston
most common compressor in ac? Answer: scroll
type of compressor that used to be most common and is still most common in
refrigeration Answer: reciprocating piston
which compressor is not positive displacement? Answer: centrifugal
where is 'A' coil normally found? Answer: residential A/C
What is the actual structural design of A coil Answer: copper tube, aluminum
fin
where is a refrigerant always in a condensor Answer: the shell
if you have a shell and tube condenser water will be in the ____ refrigerant in
_____ it will also act as a _____ Answer: tubes
shell
reciever
when is the only time there will be refrigerant in condenser tubes where there is
water Answer: direct expansion
, 3
what 4 condensers can also be evaporators Answer: tube and tube
shell and tube
copper tube with alum. fin
shell coil
all air conditioning in ace building uses what condensor Answer: tube and tube
ground source heat pumps use what type of condensor Answer: tube and tube
where are evaporator condensors commonly found Answer: hockey rink and
any ammonia system
can you use copper on ammonia systems? Answer: no... have to use steel pipe
how does captube and orifice work? Answer: smart valves. critical charge.
charged by superheat
orifice or captube increase discharge pressure does the suction pressure go up or
down? Answer: up
TX valve, what does it control? Answer: superheat controls with spring
automatic expansion if you increase spring pressure what happens? Answer: it
opens
where do you normally find automatic expansion valves? Answer: SMALL
SYstems with constant load
What is the compression ratio formula Answer: Compression ratio = Absolute
discharge pressure/Absolute suction pressure
456 psig disharge and 190 suction what the compression ratio Answer: add 14.7
round 15 to 456 psog to get 471 psia suction 205
ratio = 2.3 to 1
