FDNY Z51 RMO COMPLETE COURSE REVIEW
GUIDE
◉ A refrigerant engineer verifies that a condenser water pump is
cavitating. of the following the most likely cause for this condition is:
Answer: A faulty cooling tower water level controller
◉ A centrifugal water pump is known as a lift pump when the:
Answer: The water supply to the pump suction inlet is below the
pump level
◉ A TXV is used to maintain constant:
Answer: Evaporator superheat
◉ The chilled water supply to the building is 55F. if the chiller is
being used for human comfort, should you be concerned about this ,
and why?
Answer: Yes, this temperature is too high for human comfort
purpose
◉ The packing gland of a centrifugal pump serves to:
Answer: The drip part of the packing gland gives evidence that there
is water in the pump
,◉ Capacity control of a reciprocating hermetic compressor is
typically achieved through
Answer: Operation of the hot gas bypass valve
◉ The most important reason to sub-cool the refrigerant in the
condenser is to ensure that:
Answer: A pure liquid refrigerant will enter the metering device
◉ A refrigeration engineer is logging reading from a reciprocating
system. compressor discharge temperature have dropped
significantly and the suction line pressure is high. which of the
following that may be causing this set of condition.
Answer: An expansion valve that is open to wide
◉ A low side float valve is used to maintain:
Answer: The level of the refrigerant in the evaporator
◉ Regarding fire safety, which ASHARE refrigerant safety
classification indicates no flammability and lower the toxicity?
Answer: A1
◉ When an expansion valve is operating properly, at the end of the
evaporator will contain:
,Answer: Only superheated vapor
◉ What information is not contained in a material safety data sheet-
MSDS?
Answer: Cost of material
◉ In a steam turbine, what is the function of the kingsbury thrust
bearing
Answer: Maintain axial positioning of the rotor shaft
◉ A centrifugal water pump is considered to be fully primed when
Answer: The pump is full of liquid
◉ Copper tubing refrigerant lines must be installed for a new
system. it is a well known service practice that tubing collapses at
bends that must be made, the refrigerant engineer should use
Answer: Lever type tubing bender
◉ A reciprocating compressor is making a knocking sound during
operation. if the refrigerant worn parts are not causing the knocking,
what is probably the cause
Answer: The slugging of the liquid refrigerant
, ◉ In order for a refrigerant to become superheated in a section of
the lowside refrigerant line:
Answer: Where no liquid refrigerant is present
◉ All liquid has been recovered from a system to be overhauled, the
system
Answer: Should not be opened until all vapor has been removed
◉ When a refrigerant engineer uses a portable compressor recovery
unit to remove vapor refrigerant from a refrigeration system the
removal rate of the refrigerant will gradually slow down because
Answer: The vapor density is decreasing
◉ You are the engineer running a 2000-ton (steam-driven turbine)
centrifugal refrigeration system, a refrigeration system supplies
chilled water to a college campus with multiple buildings. During the
course of making your rounds, you check the 9 cell cooling tower on
the roof. You note the water level in all of the cooling tower cells is
very low. Which one of the following immediate action would take?
Answer: Add additional make up water to cooling tower
◉ A rooftop water cooling tower is connected to a water pump in the
building basement with a 12 inches diameter pipe. with the pump
turn off, a pressure gauge at the pumps inlet show a pressure of 140
PSIG the height of the water column, in feet, would be closet to.
GUIDE
◉ A refrigerant engineer verifies that a condenser water pump is
cavitating. of the following the most likely cause for this condition is:
Answer: A faulty cooling tower water level controller
◉ A centrifugal water pump is known as a lift pump when the:
Answer: The water supply to the pump suction inlet is below the
pump level
◉ A TXV is used to maintain constant:
Answer: Evaporator superheat
◉ The chilled water supply to the building is 55F. if the chiller is
being used for human comfort, should you be concerned about this ,
and why?
Answer: Yes, this temperature is too high for human comfort
purpose
◉ The packing gland of a centrifugal pump serves to:
Answer: The drip part of the packing gland gives evidence that there
is water in the pump
,◉ Capacity control of a reciprocating hermetic compressor is
typically achieved through
Answer: Operation of the hot gas bypass valve
◉ The most important reason to sub-cool the refrigerant in the
condenser is to ensure that:
Answer: A pure liquid refrigerant will enter the metering device
◉ A refrigeration engineer is logging reading from a reciprocating
system. compressor discharge temperature have dropped
significantly and the suction line pressure is high. which of the
following that may be causing this set of condition.
Answer: An expansion valve that is open to wide
◉ A low side float valve is used to maintain:
Answer: The level of the refrigerant in the evaporator
◉ Regarding fire safety, which ASHARE refrigerant safety
classification indicates no flammability and lower the toxicity?
Answer: A1
◉ When an expansion valve is operating properly, at the end of the
evaporator will contain:
,Answer: Only superheated vapor
◉ What information is not contained in a material safety data sheet-
MSDS?
Answer: Cost of material
◉ In a steam turbine, what is the function of the kingsbury thrust
bearing
Answer: Maintain axial positioning of the rotor shaft
◉ A centrifugal water pump is considered to be fully primed when
Answer: The pump is full of liquid
◉ Copper tubing refrigerant lines must be installed for a new
system. it is a well known service practice that tubing collapses at
bends that must be made, the refrigerant engineer should use
Answer: Lever type tubing bender
◉ A reciprocating compressor is making a knocking sound during
operation. if the refrigerant worn parts are not causing the knocking,
what is probably the cause
Answer: The slugging of the liquid refrigerant
, ◉ In order for a refrigerant to become superheated in a section of
the lowside refrigerant line:
Answer: Where no liquid refrigerant is present
◉ All liquid has been recovered from a system to be overhauled, the
system
Answer: Should not be opened until all vapor has been removed
◉ When a refrigerant engineer uses a portable compressor recovery
unit to remove vapor refrigerant from a refrigeration system the
removal rate of the refrigerant will gradually slow down because
Answer: The vapor density is decreasing
◉ You are the engineer running a 2000-ton (steam-driven turbine)
centrifugal refrigeration system, a refrigeration system supplies
chilled water to a college campus with multiple buildings. During the
course of making your rounds, you check the 9 cell cooling tower on
the roof. You note the water level in all of the cooling tower cells is
very low. Which one of the following immediate action would take?
Answer: Add additional make up water to cooling tower
◉ A rooftop water cooling tower is connected to a water pump in the
building basement with a 12 inches diameter pipe. with the pump
turn off, a pressure gauge at the pumps inlet show a pressure of 140
PSIG the height of the water column, in feet, would be closet to.
