NJ Blue Seal FINAL EXAM STUDY GUIDE
2026/2027 ACCURATE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. Why must alternators run at a constant speed? - ANSWER ✔ In order to
maintain frequency
2. What does h represent? - ANSWER ✔ The sum of latent heat and sensible
heat
3. If your cold water pump discharge pressure gauge indicated 346 psi, what
would be the head in feet? - ANSWER ✔ 346 x 2.31= 800psi
4. Formula for finding Horsepower in a Kilowatt - ANSWER ✔ 1.341 x kW =
HP
5. If you have a 500 k/W generator, what is the HP? - ANSWER ✔ 1.341 x
500 = 670.5
6. What is the formula for finding the Factor of Evaporation ? - ANSWER ✔
FE Hs -(Tfw - 32)/970.3
,7. What chemicals cause hard scale in a boiler? - ANSWER ✔ Calcium
carbonate and magnesium carbonate
8. What is the critical speed of a turbine? - ANSWER ✔ The speed at which it
vibrates the most
9. An intercooler is found: - ANSWER ✔ In a two stage air compressor
10.What protects a turbine shaft from bowing? - ANSWER ✔ A turning gear
11.When do you lubricate a turbine with oil? - ANSWER ✔ Before starting it
up
12.Which compressor utilizes a slide valve for load control? - ANSWER ✔
screw compressor
13.What is compression ratio? - ANSWER ✔ absolute discharge pressure :
absolute suction pressure
14.What is the purpose of a water jacket on a system? - ANSWER ✔ To
prevent thermal shock & remove heat
15.What schedule piping is used in an Nh3 system? - ANSWER ✔ Schedule 80
16.Where is oil req'd on a centrifugal compression system? - ANSWER ✔ At
the shaft end bearings only
,17.Define a BTU - ANSWER ✔ Work to raise 1 lb of water 1°F
18.Give the specific heat for the following: water, steam, & ice - ANSWER ✔
water = 1, steam = 0.5, ice = 0.5
19.How are compressor valves opened? - ANSWER ✔ by pressure differential
20.What is the latent heat of evaporation? - ANSWER ✔ 970.3
21.What is the latent heat of fusion? - ANSWER ✔ 144
22.What license is req'd in an ammonia plant rated 24-65 tons of toxic
refrigerant? - ANSWER ✔ Blue Seal 2-C
23.Why pre cool air in an ice making plant? - ANSWER ✔ To prevent freezing
of air lines
24.Which type of switch is used to control loading and unloading of a
compressor? - ANSWER ✔ pressure switch
25.The relationship between the actual & calculated performance of a
compressor is called: - ANSWER ✔ Mechanical efficiency
26.What main substance should be kept out of refrigeration oil? - ANSWER ✔
moisture
, 27.When is the best time to purge an ammonia plant? - ANSWER ✔ during
operation
28.How is the static setting of a thermostatic expansion valve rated? -
ANSWER ✔ in degrees superheat
29.An Nh3 compressor suction gauge should be calibrated to read between: -
ANSWER ✔ 30" vacuum & 300 psig
30.The counter-flow principle is an important feature of: - ANSWER ✔ double
piped water cooled condenser
31.How often do you inspect your relief valves on an Nh3 system? - ANSWER
✔ every 5 years
32.How often do you inspect safety valves? - ANSWER ✔ every year
33.What is the formula to convert Celsius to Fahrenheit? - ANSWER ✔ (C x
1.8) + 32
34.80°C = ___ °F - ANSWER ✔ 176°F
35.What is the thickness of a blowdown tank - ANSWER ✔ 5/16
36.What is the minimum size of a manhole - ANSWER ✔ 11x15
2026/2027 ACCURATE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. Why must alternators run at a constant speed? - ANSWER ✔ In order to
maintain frequency
2. What does h represent? - ANSWER ✔ The sum of latent heat and sensible
heat
3. If your cold water pump discharge pressure gauge indicated 346 psi, what
would be the head in feet? - ANSWER ✔ 346 x 2.31= 800psi
4. Formula for finding Horsepower in a Kilowatt - ANSWER ✔ 1.341 x kW =
HP
5. If you have a 500 k/W generator, what is the HP? - ANSWER ✔ 1.341 x
500 = 670.5
6. What is the formula for finding the Factor of Evaporation ? - ANSWER ✔
FE Hs -(Tfw - 32)/970.3
,7. What chemicals cause hard scale in a boiler? - ANSWER ✔ Calcium
carbonate and magnesium carbonate
8. What is the critical speed of a turbine? - ANSWER ✔ The speed at which it
vibrates the most
9. An intercooler is found: - ANSWER ✔ In a two stage air compressor
10.What protects a turbine shaft from bowing? - ANSWER ✔ A turning gear
11.When do you lubricate a turbine with oil? - ANSWER ✔ Before starting it
up
12.Which compressor utilizes a slide valve for load control? - ANSWER ✔
screw compressor
13.What is compression ratio? - ANSWER ✔ absolute discharge pressure :
absolute suction pressure
14.What is the purpose of a water jacket on a system? - ANSWER ✔ To
prevent thermal shock & remove heat
15.What schedule piping is used in an Nh3 system? - ANSWER ✔ Schedule 80
16.Where is oil req'd on a centrifugal compression system? - ANSWER ✔ At
the shaft end bearings only
,17.Define a BTU - ANSWER ✔ Work to raise 1 lb of water 1°F
18.Give the specific heat for the following: water, steam, & ice - ANSWER ✔
water = 1, steam = 0.5, ice = 0.5
19.How are compressor valves opened? - ANSWER ✔ by pressure differential
20.What is the latent heat of evaporation? - ANSWER ✔ 970.3
21.What is the latent heat of fusion? - ANSWER ✔ 144
22.What license is req'd in an ammonia plant rated 24-65 tons of toxic
refrigerant? - ANSWER ✔ Blue Seal 2-C
23.Why pre cool air in an ice making plant? - ANSWER ✔ To prevent freezing
of air lines
24.Which type of switch is used to control loading and unloading of a
compressor? - ANSWER ✔ pressure switch
25.The relationship between the actual & calculated performance of a
compressor is called: - ANSWER ✔ Mechanical efficiency
26.What main substance should be kept out of refrigeration oil? - ANSWER ✔
moisture
, 27.When is the best time to purge an ammonia plant? - ANSWER ✔ during
operation
28.How is the static setting of a thermostatic expansion valve rated? -
ANSWER ✔ in degrees superheat
29.An Nh3 compressor suction gauge should be calibrated to read between: -
ANSWER ✔ 30" vacuum & 300 psig
30.The counter-flow principle is an important feature of: - ANSWER ✔ double
piped water cooled condenser
31.How often do you inspect your relief valves on an Nh3 system? - ANSWER
✔ every 5 years
32.How often do you inspect safety valves? - ANSWER ✔ every year
33.What is the formula to convert Celsius to Fahrenheit? - ANSWER ✔ (C x
1.8) + 32
34.80°C = ___ °F - ANSWER ✔ 176°F
35.What is the thickness of a blowdown tank - ANSWER ✔ 5/16
36.What is the minimum size of a manhole - ANSWER ✔ 11x15
