Q-01 FDNY EXAM - COMPLETE ONE PDF - ALL
QUESTIONS + ALL MULTIPLE CHOICES + ANSWERS
IN YELLOW
Single PDF - 195 Questions - Vertical ABCD + Yellow Highlighted Answers - Complete
Question 1: Q-01 FDNY Exam In order to vary the specific capacity
of an absorption refrigerating plant, an operating engineer should
regulate the
A) Flow of steam to the generator, and adjust the expansion valve.
B) Relief valves on the generator, and the speed of the NH2 pump.
C) Speed of the absorber pump.
D) Flow of water to the condenser.
Answer:
A) Flow of steam to the generator, and adjust the expansion valve.
Question 2: The refrigerant least miscible in oil is
A) CO2
B) R-12
C) R-40
D) R-141
Answer:
A) CO2
Question 3: The first sign that the drum of ammonia refrigerant is
almost empty is
A) The appearance of frost on the lower end of the drum
B) The appearance of fog in the vicinity of the drum
C) A hissing or whistling noise in the drum
D) A gurgling noise
Answer:
C) A hissing or whistling noise in the drum
,Question 4: What is the total force exerted on a piston 3" in
diameter if pressure in the cylinder is 100 psig?
Answer:
πR2 x pressure 1.14 x 1.52 x 100 3.14 x 2.25 x 100 7.065 x 100 706.5
psi
Question 5: Breathing apparatus 1) A machine room with 1-1,000
lbs. of refrigerant needs how many masks? 2) A machine room with
1,001-2,000 lbs. of refrigerant needs how many masks?
Answer:
1) 1 - 1,000 lbs. = 1 mask 2) 1,001 - 2,000 lbs. = 2 masks
Question 6: Safety valve huddling chamber 1) How is the design
important to the function of the huddling chamber? 2) What is a
huddling chamber? 3) Where is the exact location of it on the
machine?
Answer:
1) Design- The huddling chamber has a greater diameter that the
pipe thereby having a greater total force to open the relief valve 2)
Pressure relief valve 3) On the suction elbow
Question 7: Depletion of the ozone results in three types of skin
cancer. Which of the following are the most common
non-malignant type of skin cancer?
A) Basal, squamous
B) Malignant melanoma
C) Cataracts
D) Leishmaniosis
Answer:
A) Basal, squamous
,Question 8: The suction temperature of an ammonia system reads
50° F. This temperature is equivalent to _____ psi.
Answer:
75 psi
Question 9: During the re-expansion of the compressor cycle
A) The suction valve is open
B) The suction valve is closed
C) The discharge valve is open
D) None of the above
Answer:
B) The suction valve is closed
Question 10: Where is the king valve located? Mention some details
about it.
Answer:
The king valve is located next to the condenser or receiver outlet; it
can be located on the receiver; it can be used as the liquid line
service valve.
Question 11: How is an evaporator defrosted?
Answer:
Hot gas from the discharge line is sent to the evaporator after the
metering device.
Question 12: Freon-12 has similar high and low pressures to what
other refrigerant?
Answer:
R-40, Methyl Chloride
Question 13: Evaporator - 1) If the pressure drop was less than 2.5
lbs., what would the system have? 2) 2.5 lbs. but less then than 5
, lbs. 3) 5 lbs. or more?
Answer:
1. Nothing 2. External equalizer 3. Multicircuit system
Question 14: Oil safety switch 1) Operating pressure _____? 2) 2
pressures __.__ 3) Time delay __-__ 4) Cuts off at _____.
Answer:
1) Operating pressure : 20 - 25 psi 2) Low side : oil pump 3) 90 - 120
second delay
Question 15: What is an open compressor?
Answer:
An open compressor has an external drive. Thermostatic
expansion valves are rated in
Question 16: A) Superheat settings B) Horsepower C) Tons of
refrigeration D) All of the above
A) Superheat settings
B) Horsepower
C) Tons of refrigeration
D) All of the above
Answer:
C) Tons of refrigeration
Question 17: Low pressure control
Answer:
Turns the compressor off at 30 PSI; turns on the compressor at 55
PSI.
Question 18: In an efficiently operating induced draft cooling tower,
the leaving water is between:
QUESTIONS + ALL MULTIPLE CHOICES + ANSWERS
IN YELLOW
Single PDF - 195 Questions - Vertical ABCD + Yellow Highlighted Answers - Complete
Question 1: Q-01 FDNY Exam In order to vary the specific capacity
of an absorption refrigerating plant, an operating engineer should
regulate the
A) Flow of steam to the generator, and adjust the expansion valve.
B) Relief valves on the generator, and the speed of the NH2 pump.
C) Speed of the absorber pump.
D) Flow of water to the condenser.
Answer:
A) Flow of steam to the generator, and adjust the expansion valve.
Question 2: The refrigerant least miscible in oil is
A) CO2
B) R-12
C) R-40
D) R-141
Answer:
A) CO2
Question 3: The first sign that the drum of ammonia refrigerant is
almost empty is
A) The appearance of frost on the lower end of the drum
B) The appearance of fog in the vicinity of the drum
C) A hissing or whistling noise in the drum
D) A gurgling noise
Answer:
C) A hissing or whistling noise in the drum
,Question 4: What is the total force exerted on a piston 3" in
diameter if pressure in the cylinder is 100 psig?
Answer:
πR2 x pressure 1.14 x 1.52 x 100 3.14 x 2.25 x 100 7.065 x 100 706.5
psi
Question 5: Breathing apparatus 1) A machine room with 1-1,000
lbs. of refrigerant needs how many masks? 2) A machine room with
1,001-2,000 lbs. of refrigerant needs how many masks?
Answer:
1) 1 - 1,000 lbs. = 1 mask 2) 1,001 - 2,000 lbs. = 2 masks
Question 6: Safety valve huddling chamber 1) How is the design
important to the function of the huddling chamber? 2) What is a
huddling chamber? 3) Where is the exact location of it on the
machine?
Answer:
1) Design- The huddling chamber has a greater diameter that the
pipe thereby having a greater total force to open the relief valve 2)
Pressure relief valve 3) On the suction elbow
Question 7: Depletion of the ozone results in three types of skin
cancer. Which of the following are the most common
non-malignant type of skin cancer?
A) Basal, squamous
B) Malignant melanoma
C) Cataracts
D) Leishmaniosis
Answer:
A) Basal, squamous
,Question 8: The suction temperature of an ammonia system reads
50° F. This temperature is equivalent to _____ psi.
Answer:
75 psi
Question 9: During the re-expansion of the compressor cycle
A) The suction valve is open
B) The suction valve is closed
C) The discharge valve is open
D) None of the above
Answer:
B) The suction valve is closed
Question 10: Where is the king valve located? Mention some details
about it.
Answer:
The king valve is located next to the condenser or receiver outlet; it
can be located on the receiver; it can be used as the liquid line
service valve.
Question 11: How is an evaporator defrosted?
Answer:
Hot gas from the discharge line is sent to the evaporator after the
metering device.
Question 12: Freon-12 has similar high and low pressures to what
other refrigerant?
Answer:
R-40, Methyl Chloride
Question 13: Evaporator - 1) If the pressure drop was less than 2.5
lbs., what would the system have? 2) 2.5 lbs. but less then than 5
, lbs. 3) 5 lbs. or more?
Answer:
1. Nothing 2. External equalizer 3. Multicircuit system
Question 14: Oil safety switch 1) Operating pressure _____? 2) 2
pressures __.__ 3) Time delay __-__ 4) Cuts off at _____.
Answer:
1) Operating pressure : 20 - 25 psi 2) Low side : oil pump 3) 90 - 120
second delay
Question 15: What is an open compressor?
Answer:
An open compressor has an external drive. Thermostatic
expansion valves are rated in
Question 16: A) Superheat settings B) Horsepower C) Tons of
refrigeration D) All of the above
A) Superheat settings
B) Horsepower
C) Tons of refrigeration
D) All of the above
Answer:
C) Tons of refrigeration
Question 17: Low pressure control
Answer:
Turns the compressor off at 30 PSI; turns on the compressor at 55
PSI.
Question 18: In an efficiently operating induced draft cooling tower,
the leaving water is between:
