NJ Blue Seal FINAL EXAM STUDY GUIDE
2026/2027 COMPLETE QUESTIONS WITH
VERIFIED CORRECT ANSWERS ||
100% GUARANTEED PASS
<NEWEST 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.What is the formula used to calculate Btu's in a pound of fuel? - ANSWER
✔ Btu's/lb. fuel= 17,687(57.7 x API) Plus (+) then Times (x)
13.the size of the water column connections to a boiler must be a minimum of: -
ANSWER ✔ 1 inch
14.What is the formula used to calculate the speed of a synchronous motor? -
ANSWER ✔ 120 x F/P
15.What is the stationary passage of a reaction turbine called? - ANSWER ✔
Fixed blade
,16.On a single acting reciprocating compressor, what is the function of a dual
control device? - ANSWER ✔ It allows constant speed control and
automatic start and stops
17.If a system were using an automatic expansion valve, what would the
constant pressure be maintained at? - ANSWER ✔ The evaporator
18.What is the main advantage of a cascade refrigeration system? - ANSWER
✔ Capable of reaching very low temperature
19.Choose the statement below, which would prove false about lithium bromide
used in absorption system. - ANSWER ✔ It is non-corrosive
20.What is a sling psychrometer device used to measure? - ANSWER ✔
Relative humidity
21.A system using an evaporative condenser operates most efficiently under
what conditions? - ANSWER ✔ When the wet-bulb temperature of air is
low
22.Where are oil separators located in an ammonia system? - ANSWER ✔ On
the discharge line close to the compressor
23.What does a low side float prevent? - ANSWER ✔ Over filling of the
flooded evaporator
24.What is the capacity of a 100 ton refrigeration unit? - ANSWER ✔ 20,000
btu/min
, 25.What is the purpose of a water jacket on a system? - ANSWER ✔ To
prevent thermal shock and to remove heat
26.What is the definition of compression ratio? - ANSWER ✔ Ratio of the
absolute discharge pressure to the absolute suction pressure
27.Refrigerant recycling is defined as - ANSWER ✔ Cleaning refrigerant of
dirt and contaminates
28.How many tons of refrigerant is required to prevent 2,000 lbs of ice from
melting in 24 hours? - ANSWER ✔ 1 ton
29.Before starting new refrigeration equipment, what must you do? - ANSWER
✔ Have it inspected
30.The static setting of a thermostatic expansion valve is - ANSWER ✔
Degrees of superheat
31.600,000 btu/hr equals ____ tons of refrigeration? - ANSWER ✔ 50 tons
32.What would indicated that your expansion valve is leaking? - ANSWER ✔
Suction line would begin to frost up
33.On a liquid level site glass, what precaution is used for safety from leakage?
- ANSWER ✔ Ball checks
2026/2027 COMPLETE QUESTIONS WITH
VERIFIED CORRECT ANSWERS ||
100% GUARANTEED PASS
<NEWEST 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.What is the formula used to calculate Btu's in a pound of fuel? - ANSWER
✔ Btu's/lb. fuel= 17,687(57.7 x API) Plus (+) then Times (x)
13.the size of the water column connections to a boiler must be a minimum of: -
ANSWER ✔ 1 inch
14.What is the formula used to calculate the speed of a synchronous motor? -
ANSWER ✔ 120 x F/P
15.What is the stationary passage of a reaction turbine called? - ANSWER ✔
Fixed blade
,16.On a single acting reciprocating compressor, what is the function of a dual
control device? - ANSWER ✔ It allows constant speed control and
automatic start and stops
17.If a system were using an automatic expansion valve, what would the
constant pressure be maintained at? - ANSWER ✔ The evaporator
18.What is the main advantage of a cascade refrigeration system? - ANSWER
✔ Capable of reaching very low temperature
19.Choose the statement below, which would prove false about lithium bromide
used in absorption system. - ANSWER ✔ It is non-corrosive
20.What is a sling psychrometer device used to measure? - ANSWER ✔
Relative humidity
21.A system using an evaporative condenser operates most efficiently under
what conditions? - ANSWER ✔ When the wet-bulb temperature of air is
low
22.Where are oil separators located in an ammonia system? - ANSWER ✔ On
the discharge line close to the compressor
23.What does a low side float prevent? - ANSWER ✔ Over filling of the
flooded evaporator
24.What is the capacity of a 100 ton refrigeration unit? - ANSWER ✔ 20,000
btu/min
, 25.What is the purpose of a water jacket on a system? - ANSWER ✔ To
prevent thermal shock and to remove heat
26.What is the definition of compression ratio? - ANSWER ✔ Ratio of the
absolute discharge pressure to the absolute suction pressure
27.Refrigerant recycling is defined as - ANSWER ✔ Cleaning refrigerant of
dirt and contaminates
28.How many tons of refrigerant is required to prevent 2,000 lbs of ice from
melting in 24 hours? - ANSWER ✔ 1 ton
29.Before starting new refrigeration equipment, what must you do? - ANSWER
✔ Have it inspected
30.The static setting of a thermostatic expansion valve is - ANSWER ✔
Degrees of superheat
31.600,000 btu/hr equals ____ tons of refrigeration? - ANSWER ✔ 50 tons
32.What would indicated that your expansion valve is leaking? - ANSWER ✔
Suction line would begin to frost up
33.On a liquid level site glass, what precaution is used for safety from leakage?
- ANSWER ✔ Ball checks
