Reta Industrial Refrigeration Book 2 EXAM 2025/2026 ACTUAL
COMPREHENSIVE REAL EXAM QUESTIONS WITH MULTIPLE
CHOICES |VERIFIED & REVISED ANSWERS / ALREADY
GRADED A+ / 2025 ( BRAND NEW!!)
How much de-superheating of the discharge gas is
being done by the
compressor lubrication
system?
A) 29°F
B) 35°F
C)
51°F
D) 85°F - ANSWER-C)
35°F
(Oil cooler inlet temp - oil
temperature)
(171°F - 136°F =
35°F)
What is the condition of the refrigerant at the oil cooler
refrigerant outlet?
,A) Sub-cooled
B) Superheated
C) Saturated
D) Superheated mixture of gas and liquid - ANSWER-C)
Saturated
(Condenser Outlet Pressure is 181 PSIG, Refrigerant Outlet
Temperature is 95°F, this is SAT)
What is the partial pressure of air in this system?
A) 0 PSI
B) 5 PSI
C) 10 PSI
D) 15 PSI - ANSWER-A) 0 PSI
(there are no non-condensables gases present in the system)
What is the instantaneous kW demand developed by the
compressor motor under abnormal conditions? (3 phase
motor)
A) 225 kW
B) 242 kW
C) 302 kW
D) 325 kW - ANSWER-B) 242 kW kW = A x V x PF x 1.
kW = 339 x 480 .86 x 1. = 242 kW
,If the compressor ran constantly at the instantaneous kW
demand calculated from the previous question for 14 hours and
the price charged by the power company for a kWh of energy is
$0.09, approximately how much money will the power company
be paid to operate the compressor for that 14-hour production
run? A) $410
B) $381
C) $305
D) $284 - ANSWER-C) $305
Cost = (kWh price x kWh) x time in hours
Cost = ($0.09 x 242 kWh) x 14 hours = $305
What might be happening that is causing the abnormal
situation for this system?
A) Air in the system
B) Condenser fans are not running
C) Condenser eliminators are plugged up
D) Scale is insulating the coil surface - ANSWER-B) Condenser
fans are not running
What is the excess cost to operate the compressor for the 14-
hour production
shift when operating under the abnormal
conditions?
, A) $40
B) $19
C)
$67
D) $26 - ANSWER-A)
$40
Cost to operate under normal
conditions = $265
Cost to operate under abnormal
conditions = $305
$305 - $ 265 =
$40
In a two-stage system the booster compressor discharge gas is
normally fed to? (pg. 9-15/16)
A) The condenser
B) The discharge pressure of the high-stage compressor
C) The suction side of the high temperature evaporator
D) A de-superheating device, then the high-stage compressor -
ANSWER-D) A de-superheating device, then the high-stage
compressor
What is intermediate pressure? (pg. 9-4/15)
A) Any pressure reading between the high-stage compressor
and the condenser
COMPREHENSIVE REAL EXAM QUESTIONS WITH MULTIPLE
CHOICES |VERIFIED & REVISED ANSWERS / ALREADY
GRADED A+ / 2025 ( BRAND NEW!!)
How much de-superheating of the discharge gas is
being done by the
compressor lubrication
system?
A) 29°F
B) 35°F
C)
51°F
D) 85°F - ANSWER-C)
35°F
(Oil cooler inlet temp - oil
temperature)
(171°F - 136°F =
35°F)
What is the condition of the refrigerant at the oil cooler
refrigerant outlet?
,A) Sub-cooled
B) Superheated
C) Saturated
D) Superheated mixture of gas and liquid - ANSWER-C)
Saturated
(Condenser Outlet Pressure is 181 PSIG, Refrigerant Outlet
Temperature is 95°F, this is SAT)
What is the partial pressure of air in this system?
A) 0 PSI
B) 5 PSI
C) 10 PSI
D) 15 PSI - ANSWER-A) 0 PSI
(there are no non-condensables gases present in the system)
What is the instantaneous kW demand developed by the
compressor motor under abnormal conditions? (3 phase
motor)
A) 225 kW
B) 242 kW
C) 302 kW
D) 325 kW - ANSWER-B) 242 kW kW = A x V x PF x 1.
kW = 339 x 480 .86 x 1. = 242 kW
,If the compressor ran constantly at the instantaneous kW
demand calculated from the previous question for 14 hours and
the price charged by the power company for a kWh of energy is
$0.09, approximately how much money will the power company
be paid to operate the compressor for that 14-hour production
run? A) $410
B) $381
C) $305
D) $284 - ANSWER-C) $305
Cost = (kWh price x kWh) x time in hours
Cost = ($0.09 x 242 kWh) x 14 hours = $305
What might be happening that is causing the abnormal
situation for this system?
A) Air in the system
B) Condenser fans are not running
C) Condenser eliminators are plugged up
D) Scale is insulating the coil surface - ANSWER-B) Condenser
fans are not running
What is the excess cost to operate the compressor for the 14-
hour production
shift when operating under the abnormal
conditions?
, A) $40
B) $19
C)
$67
D) $26 - ANSWER-A)
$40
Cost to operate under normal
conditions = $265
Cost to operate under abnormal
conditions = $305
$305 - $ 265 =
$40
In a two-stage system the booster compressor discharge gas is
normally fed to? (pg. 9-15/16)
A) The condenser
B) The discharge pressure of the high-stage compressor
C) The suction side of the high temperature evaporator
D) A de-superheating device, then the high-stage compressor -
ANSWER-D) A de-superheating device, then the high-stage
compressor
What is intermediate pressure? (pg. 9-4/15)
A) Any pressure reading between the high-stage compressor
and the condenser
