FDNY Q-01 EXAM 2026 Questions and Answers
100% Verified Graded A+
1. Rupture members, when used in parallel with a relief valve, are not to exceed
% above designed working pressure
Answer 20%
2. Butterfly valve where can it be used?
Answer Can be used on the inlet and outlet of a water pump
3. What electrical motor protection device automatically resets itself?
Answer The thermal protector
4. 746 watts equals how many kilowatt hours?
Answer .746 kilowatt hours
5. What position is the liquid line service valve normally in?
Answer Back-seated
6. In an operating evaporator, oil stays on top of which refrigerant?
,Answer Carbon dioxide, R-744
7. At what pressure does the relief valve blow on a high pressure machine?
Answer 300 psi
8. What would indicate a restriction (such as dirt or scale) in the liquid line?
Answer Frost immediately after the restriction
9. What does solubility mean?
Answer The ability of a refrigerant to mix with other substances
10. Charging Vapor —In a compression system, where do you charge the va-
por?
Answer Suction side of the compressor at the Suction Service Valve
11. When comparing a brine with s PH of 8 to one with a PH of 10, its alkalinity is
Answer 100 times greater (ex. PH 8 to PH 9 is 10 times greater)
12. In an efficiently operating induced draft cooling tower, the leaving water is
between
Answer Dry bulb and wet bulb temperature
13. To produce the desired evaporator temperature, the power input is reduced
by keeping head pressure...
Answer Head pressure as low as possible & suction pressure as high as needed
,14. The accumulator is usually between the...
Answer Compressor and evaporator
15. An oiling system in a large centrifugal system should consist of at least...
Answer -
Reservoir, pump and distribution lines
16. In an evaporator that chills brine, the greatest cooling effect on the brine
results from the...
Answer Boiling of low pressure liquid
17. The flow of weak liquor to the absorber is controlled by
A) gas pressure
B) throttling device
C) float valve
D) pressure of the strong liquor pump
Answer B) throttling device
18. The best way of detecting ammonia brine is by using
A) CO2 gas
B) potassium of lime
, C) Nessler reagent
D) carbonate of soda
Answer C) Nessler reagent
19. The best time to purge an ammonia plant with 250 lbs. of ammonia is
A) during shut-down, because you will lose ammonia
B) while charging the plant
C) during operation
D) none of the above
Answer C) during operation
20. What will make the strong liquor in the absorber decrease?
A) expansion valve open too much
B) A decrease in evaporator load
C) An increase in evaporator load
D) Too much steam on the generator
Answer B) A decrease in evaporator load
21. Which of the following statements is incorrect?
A) A service valve is a key-operated shut-off valve used during shipment, instal-
100% Verified Graded A+
1. Rupture members, when used in parallel with a relief valve, are not to exceed
% above designed working pressure
Answer 20%
2. Butterfly valve where can it be used?
Answer Can be used on the inlet and outlet of a water pump
3. What electrical motor protection device automatically resets itself?
Answer The thermal protector
4. 746 watts equals how many kilowatt hours?
Answer .746 kilowatt hours
5. What position is the liquid line service valve normally in?
Answer Back-seated
6. In an operating evaporator, oil stays on top of which refrigerant?
,Answer Carbon dioxide, R-744
7. At what pressure does the relief valve blow on a high pressure machine?
Answer 300 psi
8. What would indicate a restriction (such as dirt or scale) in the liquid line?
Answer Frost immediately after the restriction
9. What does solubility mean?
Answer The ability of a refrigerant to mix with other substances
10. Charging Vapor —In a compression system, where do you charge the va-
por?
Answer Suction side of the compressor at the Suction Service Valve
11. When comparing a brine with s PH of 8 to one with a PH of 10, its alkalinity is
Answer 100 times greater (ex. PH 8 to PH 9 is 10 times greater)
12. In an efficiently operating induced draft cooling tower, the leaving water is
between
Answer Dry bulb and wet bulb temperature
13. To produce the desired evaporator temperature, the power input is reduced
by keeping head pressure...
Answer Head pressure as low as possible & suction pressure as high as needed
,14. The accumulator is usually between the...
Answer Compressor and evaporator
15. An oiling system in a large centrifugal system should consist of at least...
Answer -
Reservoir, pump and distribution lines
16. In an evaporator that chills brine, the greatest cooling effect on the brine
results from the...
Answer Boiling of low pressure liquid
17. The flow of weak liquor to the absorber is controlled by
A) gas pressure
B) throttling device
C) float valve
D) pressure of the strong liquor pump
Answer B) throttling device
18. The best way of detecting ammonia brine is by using
A) CO2 gas
B) potassium of lime
, C) Nessler reagent
D) carbonate of soda
Answer C) Nessler reagent
19. The best time to purge an ammonia plant with 250 lbs. of ammonia is
A) during shut-down, because you will lose ammonia
B) while charging the plant
C) during operation
D) none of the above
Answer C) during operation
20. What will make the strong liquor in the absorber decrease?
A) expansion valve open too much
B) A decrease in evaporator load
C) An increase in evaporator load
D) Too much steam on the generator
Answer B) A decrease in evaporator load
21. Which of the following statements is incorrect?
A) A service valve is a key-operated shut-off valve used during shipment, instal-
