NJ Black Seal Steam System
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What does it mean when a refrigerant is anhydrous - Correct Answer:
absent of water
2. What value is the latent heat of fusion for water - Correct Answer: 144
BTU/hr
3. Where is the booster compressor of a 2-stage refrigeration system located?
- Correct Answer: between evaporator and intercooler
4. Name the three methods of heat transfer? - Correct Answer:
conduction, convection, radiation
5. What will cause high head pressure - Correct Answer: poor air flow
across condenser, clogged condenser, bad condenser fan motor, non
condensables in refrigerant, overcharge
6. What 2 values are needed to calculate the amount of refrigeration required
- Correct Answer: amount of btu's to be removed and the time required
to move it
,7. Give the specific heat for the following: water, steam, and ice - Correct
Answer: 1, .5, .5
8. A refrigerant cylinder has a 125 lb capacity. how many pounds can be stored
in it - Correct Answer: 125*.8=100 lbs
9. In a shell and tube heat exchanger, where is the refrigerant located? -
Correct Answer: in the shell
10.What is the latent heat of ammonia at 5 F - Correct Answer: 565 BTU/lb
11.What is the pressure at 5 F of ammonia - Correct Answer: 19.6 PSIG
12.What are the 4 steps of a mechanical refrigeration system - Correct
Answer: compression, condensation, expansion, and evaporation
13.Define British Thermal Unit - Correct Answer: the amount of BTU
needed to raise the temp of 1 lb of water 1 degree F in 1 hr
14.What refrigerant sublimates at 12.7 PSIA - Correct Answer: CO2, dry ice
15.What main substance should be kept out of refrigeration oil - Correct
Answer: moisture
,16.How often should you have your relief valves recertified on an ammonia
system - Correct Answer: every 5 years
17.When is the best time to purge an ammonia plant with a 250-pound drum -
Correct Answer: during operation before shut down
18.Where is the scale trap located - Correct Answer: Between the
compressor and evaporator
19.On a 10ft refrigerant line, what is the correct pitch - Correct Answer: 1/4
inch downward toward flow
20.The specific gravity of brine is measured: - Correct Answer: To
determine how much calcium chloride it contains
21.how often do you inspect safety valves - Correct Answer: Annually
22.name the 4 parts of a refrigeration system - Correct Answer:
Compressor, condenser, metering device, evaporator
23.what is the total force exerted on a 2inch piston with a cylinder pressure of
130 PSI - Correct Answer: 2*2*(.7854)*130=408 LBS of force
, 24.what is the formula for total dynamic head - Correct Answer:
TDH=Hs+Hp+Hf+Hv
25.If power is removed from a solenoid valve and it opens, it is said to be what
type of valve? - Correct Answer: normally open solenoid valve
26.An NH3 compressor low side compound gauge is usually calibrated to read
from - Correct Answer: 30" vacuum to 300 PSIG
27.on an ammonia compression system, compression ratio can be described as
- Correct Answer: the ration of absolute discharge pressure to absolute
suction pressure
28.what is the absorbent in an ammonia refrigeration system - Correct
Answer: water (R-718)
29.which of the following would (not) cause high head pressure - Correct
Answer: refrigerant undercharge
30.If a compound gauge reads 15" Hg, what is its equivalent in psig? -
Correct Answer: 7.5 PSIG
31.Calculate the rpm's of a four pole motor rated at 150 HP, 120 volts, and 60
cycles. - Correct Answer: 120*60/4=1,800 RPM
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What does it mean when a refrigerant is anhydrous - Correct Answer:
absent of water
2. What value is the latent heat of fusion for water - Correct Answer: 144
BTU/hr
3. Where is the booster compressor of a 2-stage refrigeration system located?
- Correct Answer: between evaporator and intercooler
4. Name the three methods of heat transfer? - Correct Answer:
conduction, convection, radiation
5. What will cause high head pressure - Correct Answer: poor air flow
across condenser, clogged condenser, bad condenser fan motor, non
condensables in refrigerant, overcharge
6. What 2 values are needed to calculate the amount of refrigeration required
- Correct Answer: amount of btu's to be removed and the time required
to move it
,7. Give the specific heat for the following: water, steam, and ice - Correct
Answer: 1, .5, .5
8. A refrigerant cylinder has a 125 lb capacity. how many pounds can be stored
in it - Correct Answer: 125*.8=100 lbs
9. In a shell and tube heat exchanger, where is the refrigerant located? -
Correct Answer: in the shell
10.What is the latent heat of ammonia at 5 F - Correct Answer: 565 BTU/lb
11.What is the pressure at 5 F of ammonia - Correct Answer: 19.6 PSIG
12.What are the 4 steps of a mechanical refrigeration system - Correct
Answer: compression, condensation, expansion, and evaporation
13.Define British Thermal Unit - Correct Answer: the amount of BTU
needed to raise the temp of 1 lb of water 1 degree F in 1 hr
14.What refrigerant sublimates at 12.7 PSIA - Correct Answer: CO2, dry ice
15.What main substance should be kept out of refrigeration oil - Correct
Answer: moisture
,16.How often should you have your relief valves recertified on an ammonia
system - Correct Answer: every 5 years
17.When is the best time to purge an ammonia plant with a 250-pound drum -
Correct Answer: during operation before shut down
18.Where is the scale trap located - Correct Answer: Between the
compressor and evaporator
19.On a 10ft refrigerant line, what is the correct pitch - Correct Answer: 1/4
inch downward toward flow
20.The specific gravity of brine is measured: - Correct Answer: To
determine how much calcium chloride it contains
21.how often do you inspect safety valves - Correct Answer: Annually
22.name the 4 parts of a refrigeration system - Correct Answer:
Compressor, condenser, metering device, evaporator
23.what is the total force exerted on a 2inch piston with a cylinder pressure of
130 PSI - Correct Answer: 2*2*(.7854)*130=408 LBS of force
, 24.what is the formula for total dynamic head - Correct Answer:
TDH=Hs+Hp+Hf+Hv
25.If power is removed from a solenoid valve and it opens, it is said to be what
type of valve? - Correct Answer: normally open solenoid valve
26.An NH3 compressor low side compound gauge is usually calibrated to read
from - Correct Answer: 30" vacuum to 300 PSIG
27.on an ammonia compression system, compression ratio can be described as
- Correct Answer: the ration of absolute discharge pressure to absolute
suction pressure
28.what is the absorbent in an ammonia refrigeration system - Correct
Answer: water (R-718)
29.which of the following would (not) cause high head pressure - Correct
Answer: refrigerant undercharge
30.If a compound gauge reads 15" Hg, what is its equivalent in psig? -
Correct Answer: 7.5 PSIG
31.Calculate the rpm's of a four pole motor rated at 150 HP, 120 volts, and 60
cycles. - Correct Answer: 120*60/4=1,800 RPM
