RETA Industrial Refrigeration Book 1 Exam | Complete Questions and Correct Answers | Verified Answers | Newest Version | Just Released

RETA Industrial Refrigeration Book 1 Exam | Complete
Questions and Correct Answers | Verified Answers |
Newest Version | Just Released

An HCFC-22 liquid line is operating at 85°F and 185 PSIG. What is the condition of
the refrigerant in the line? (pg. 4-17)
A) Saturated vapor
B) Saturated liquid
C) 11°F superheated liquid
D) 11°F subcooled liquid ---------CORRECT ANSWER-----------------D) 11°F subcooled
liquid




An ammonia compressor is operating with -30°F suction temperature and a
suction pressure of 8.7 inches of vacuum. What is the condition of the suction
vapor? (pg. 4-4)
A) 10°F superheated
B) -10°F subcooled
C) Saturated
D) 15°F superheated ---------CORRECT ANSWER-----------------A) 10°F superheated




An ammonia vessel is rated at 34 cubic feet of liquid ammonia 80% full and 95°F.
How many pounds of liquid ammonia will it safely hold? (pg. 4-
A) 3486 pounds at 95°F
B) 111 pounds at 95°F

,C) 52 pounds at 95°F
D) 1248 pounds at 95°F ---------CORRECT ANSWER-----------------D) 1248 pounds at
95°F
(34 cubic feet x 36.71 cubic feet/lb. = 1248 lbs.)




0 PSIG is equal to? (4-3)
A) 14.7 PSIA
B) 0 PSIA
C) -14.7 PSIA
D) 4" vacuum ---------CORRECT ANSWER-----------------A) 14.7 PSIA




An ammonia system is operating with a suction pressure of 6 PSIG, the suction
line has a 3-pound pressure drop. The evaporating temperature is? (pg. 4-6)
A) -10°F
B) -16°F
C) -21°F
D) -31°F ---------CORRECT ANSWER-----------------A) -10°F
(evaporating pressure would be 9 PSIG, which is -10°F)




If a cylinder of HCFC-22 containing a mixture of liquid and vapor is heated from
70°F to 165°F, what would be indicated? (pg. 4-19)
A) Excessive and dangerous pressure

,B) A superheated vapor
C) The cylinder is ready to use to charge a system
D) Nothing, this is a normal operating pressure for HCFC-22 ---------CORRECT
ANSWER-----------------A) Excessive and dangerous pressure




At 70°F? (pg. 4-9/16)
A) HCFC-22 is lighter than ammonia
B) Ammonia is lighter than HCFC-22
C) Ammonia and HCFC-22 weight the same
D) Ammonia and HCFC-22 both become superheated vapor ---------CORRECT
ANSWER-----------------A) HCFC-22 is lighter than ammonia




An ammonia suction line has been calculated to have a volume of 7 cubic feet.
How many pounds of saturated ammonia vapor at -30°F would this suction line
contain? (pg. 4-5)
A) 0.37 lbs.
B) 29.9 lbs.
C) 30.1 lbs.
D) 36.9 lbs. ---------CORRECT ANSWER-----------------A) 0.37 lbs.
(vapor density at -30°F is 0.0526 lbs./cubic foot)
(0.0526 x 7 = 0.37 lbs.)

, How many cubic feet of 30°F saturated ammonia vapor would result from
vaporizing 65 pounds of saturated ammonia at 30°F? (pg. 4-7)
A) 314 cubic feet
B) 1.63 cubic feet
C) 323 cubic feet
D) 16.3 cubic feet ---------CORRECT ANSWER-----------------A) 314 cubic feet
(specific vapor at 30°F is 4.8360 x 65 lbs. = 314 cubic feet)




An HCFC-22 liquid line has a volume of 0.15 cubic feet. How many pounds of
saturated HCFC-22 liquid at 105°F will the line hold? (pg. 4-17)
A) 18.55 lbs.
B) 12.13 lbs.
C) 10.57 lbs.
D) 0.63 lbs. ---------CORRECT ANSWER-----------------C) 10.57 lbs.
(liquid density at 105°F is 70.47 lbs./cubic foot)
(70.47 lbs./cubic foot x 0.15 cubic feet = 10.57 lbs.)




An HCFC-22 compressor is operating with a suction pressure of 30 PSIG. The
suction temperature is 12°F, what is indicated? (pg. 4-15)
A) Suction vapor is 5°F superheated
B) Suction vapor is 10°F superheated
C) Suction vapor is saturated
D) Liquid refrigerant may enter the compressor ---------CORRECT ANSWER-----------
------A) Suction vapor is 5°F superheated