Q-01 FDNY QUESTIONS WITH
VERIFIED ANSWERS |LATEST UPDATE
If purging does not occur in a refrigerating system, what is the result?
A) High-head pressure
B) Low condense pressure
C) Low head pressure
D) All of the above - ANSWER-A) High-head pressure
In a Freon refrigerating system in which all piping is made up of hard copper
fittings and streamlined "wrought"-type fittings, the joints should be
A) Screwed
B) Soldered or brazed
C) Flanged with ground faces
D) Flanged with lined rubber gaskets - ANSWER-B) Soldered or brazed
One effect of noncondensable gas in a system is
,A) High suction pressure
B) Low suction pressure
C) High condenser pressure
D) Low condenser pressure - ANSWER-C) High condenser pressure
The manometer measure
A) Pressure of vapors and gases
B) The difference in absolute temperature
C) Relative humidity
D) Dew point - ANSWER-A) Pressure of vapors and gases
To determine the refrigerant type on air-conditioning equipment, the technician
must
A) Read the equipment name plate
B) Read the expansion valve plate
C) Connect manifold gauges and compare the pressure
D) Pump down the system and take samples - ANSWER-A) Read the equipment
name plate
,Chlorine-based refrigerants without hydrogen are so stable that they do not break
down in the lower atmosphere
A) Until 10 to 20 years after their release
B) Until 20 to 40 years after their release
C) Until 40 to 70 years after their release
D) Even after 100 years or more after being released - ANSWER-D) Even after 100
years or more after being released
The scale trap is located between the
A) Compressor and condenser
B) Condenser and receiver
C) Receiver and evaporator
D) Compressor and evaporator - ANSWER-D) Compressor and evaporator
According to ASHRAE Standard R15 (Safety Code for Mechanical Refrigeration), an
Oxygen Deprivation Sensor can also be used as
A) An automatic purger
B) A breathing apparatus
C) A refrigeration leak detector
D) Mechanical ventilation - ANSWER-C) A refrigeration leak detector
, In a system containing 2,000 pounds of refrigerant, the mechanical air discharge
from the engine room should be
A) 2,500 cfm
B) 2,750 cfm
C) 2,900 cfm
D) 3,050 cfm - ANSWER-C) 2,900 cfm
In an automatically operated, flooded shell-and-tube cooler, an electric float
switch is used primarily to
A) Control the flow of brine into the tubes
B) Control the flow of refrigerant into the shell
C) Purge oil from the cooler
D) Purge noncondensable gas from the cooler - ANSWER-B) Control the flow of
refrigerant into the shell
A 10-ton refrigeration unit has a capacity of
A) 2,000 btu per minute
B) 12,000 btu per hour
C) 20,000 btu per minute
D) 144,000 btu per day - ANSWER-A) 2,000 btu per minute
VERIFIED ANSWERS |LATEST UPDATE
If purging does not occur in a refrigerating system, what is the result?
A) High-head pressure
B) Low condense pressure
C) Low head pressure
D) All of the above - ANSWER-A) High-head pressure
In a Freon refrigerating system in which all piping is made up of hard copper
fittings and streamlined "wrought"-type fittings, the joints should be
A) Screwed
B) Soldered or brazed
C) Flanged with ground faces
D) Flanged with lined rubber gaskets - ANSWER-B) Soldered or brazed
One effect of noncondensable gas in a system is
,A) High suction pressure
B) Low suction pressure
C) High condenser pressure
D) Low condenser pressure - ANSWER-C) High condenser pressure
The manometer measure
A) Pressure of vapors and gases
B) The difference in absolute temperature
C) Relative humidity
D) Dew point - ANSWER-A) Pressure of vapors and gases
To determine the refrigerant type on air-conditioning equipment, the technician
must
A) Read the equipment name plate
B) Read the expansion valve plate
C) Connect manifold gauges and compare the pressure
D) Pump down the system and take samples - ANSWER-A) Read the equipment
name plate
,Chlorine-based refrigerants without hydrogen are so stable that they do not break
down in the lower atmosphere
A) Until 10 to 20 years after their release
B) Until 20 to 40 years after their release
C) Until 40 to 70 years after their release
D) Even after 100 years or more after being released - ANSWER-D) Even after 100
years or more after being released
The scale trap is located between the
A) Compressor and condenser
B) Condenser and receiver
C) Receiver and evaporator
D) Compressor and evaporator - ANSWER-D) Compressor and evaporator
According to ASHRAE Standard R15 (Safety Code for Mechanical Refrigeration), an
Oxygen Deprivation Sensor can also be used as
A) An automatic purger
B) A breathing apparatus
C) A refrigeration leak detector
D) Mechanical ventilation - ANSWER-C) A refrigeration leak detector
, In a system containing 2,000 pounds of refrigerant, the mechanical air discharge
from the engine room should be
A) 2,500 cfm
B) 2,750 cfm
C) 2,900 cfm
D) 3,050 cfm - ANSWER-C) 2,900 cfm
In an automatically operated, flooded shell-and-tube cooler, an electric float
switch is used primarily to
A) Control the flow of brine into the tubes
B) Control the flow of refrigerant into the shell
C) Purge oil from the cooler
D) Purge noncondensable gas from the cooler - ANSWER-B) Control the flow of
refrigerant into the shell
A 10-ton refrigeration unit has a capacity of
A) 2,000 btu per minute
B) 12,000 btu per hour
C) 20,000 btu per minute
D) 144,000 btu per day - ANSWER-A) 2,000 btu per minute
