FDNY Z51 RMO 2026 EXAMINATION SET QUESTIONS
AND ANSWERS RATED A+
✔✔How would you put an additional pump online? - ✔✔Open suction valve, open
discharge valve gradually
✔✔Of the following, the major advantage of a shell and coil condenser is: - ✔✔There is
less dangers of developing leaks
✔✔An engineer needs to vary the flow of refrigerant in a refrigeration system. which
operation in the flow of the system does not include: - ✔✔Solenoid valve
✔✔thermal bulb is attached to the suction pipe between the evaporator coil and the
compressor by an insulated line. assume that the machinery room is at 85F. break
down of the insulation results in: - ✔✔Flood the evaporator
✔✔A chill water system uses refrigerant R134 a leak in the evaporator shell may result
in: - ✔✔Set off the refrigerant monitor alarm
✔✔What are steam ejector used for on the surface condenser of a system with a
turbine: - ✔✔To create a proper opening exhaust system
✔✔Water and moisture is serious problem in a refrigerant system how to avoid: -
✔✔Proper evacuation at the charging of the system
✔✔The most important requirements for a good evaporator is that: - ✔✔It must have
enough cooling surface to absorb the required heat
✔✔While on duty a refrigeration engineer notice that the suction line to the compressor
and part of the compressor itself is frosted of the following, the most likely reason for
this condition would be: - ✔✔There is not enough refrigerant in the system
, ✔✔While doing a routine line inspection, the engineer notices the bulb of the TXV on
the floor refrigerant engineer should attach bulb at the : - ✔✔The outlet end of the coil
✔✔To convert water 32F to ice at the same temperature a refrigeration system must
remove: - ✔✔The latent heat of fusion
✔✔The use of oil in the refrigeration machine is to: - ✔✔Reduce wear and friction in the
compressor parts
✔✔The following is a desirable property in a refrigeration - ✔✔High latent heat
✔✔The cooling medium for an evaporative condenser is: - ✔✔Air and water
✔✔The ratio of the actual pressure of water vapor in the atmosphere to the saturated
pressure of give temperature is: - ✔✔Relative humidity
✔✔The only refrigerant/ temperature chart available to a refrigerant engineer list the
temperature is degrees Celsius if the chart indicates a Celsius temperature of 4 degrees
to equivalent to F: - ✔✔39.2 degrees
✔✔A refrigerant engineers was instructed to charge of 60 ton plant with R134A
refrigerant. the refrigerant engineer will most likely find the charging valve on the -
✔✔Low pressure side of the system
✔✔A refrigerant engineer verifies that a chilled water pump is cavitating. of the following
the most likely cause for this condition is: - ✔✔Water leaks through the mechanical
seals
✔✔There is a decrease in the efficiency of a reciprocating compressor. this most likely
caused by: - ✔✔Leaking suction valve
✔✔The suction and discharge valve of the reciprocating compressor are mounted as
follows: - ✔✔Discharge valves on top of the valve plate and suction valve below
✔✔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. while making your rounds you notice that the discharge pressure
of your condenser water pumps is significantly lower than normal. which of the following
action would you avoid taking: - ✔✔Put on an additional surface condenser pump and
lower the chilled water set point
✔✔A water pump is discharge against head 92 feet of water, this is approximately to a
pressure of: - ✔✔40 psi
AND ANSWERS RATED A+
✔✔How would you put an additional pump online? - ✔✔Open suction valve, open
discharge valve gradually
✔✔Of the following, the major advantage of a shell and coil condenser is: - ✔✔There is
less dangers of developing leaks
✔✔An engineer needs to vary the flow of refrigerant in a refrigeration system. which
operation in the flow of the system does not include: - ✔✔Solenoid valve
✔✔thermal bulb is attached to the suction pipe between the evaporator coil and the
compressor by an insulated line. assume that the machinery room is at 85F. break
down of the insulation results in: - ✔✔Flood the evaporator
✔✔A chill water system uses refrigerant R134 a leak in the evaporator shell may result
in: - ✔✔Set off the refrigerant monitor alarm
✔✔What are steam ejector used for on the surface condenser of a system with a
turbine: - ✔✔To create a proper opening exhaust system
✔✔Water and moisture is serious problem in a refrigerant system how to avoid: -
✔✔Proper evacuation at the charging of the system
✔✔The most important requirements for a good evaporator is that: - ✔✔It must have
enough cooling surface to absorb the required heat
✔✔While on duty a refrigeration engineer notice that the suction line to the compressor
and part of the compressor itself is frosted of the following, the most likely reason for
this condition would be: - ✔✔There is not enough refrigerant in the system
, ✔✔While doing a routine line inspection, the engineer notices the bulb of the TXV on
the floor refrigerant engineer should attach bulb at the : - ✔✔The outlet end of the coil
✔✔To convert water 32F to ice at the same temperature a refrigeration system must
remove: - ✔✔The latent heat of fusion
✔✔The use of oil in the refrigeration machine is to: - ✔✔Reduce wear and friction in the
compressor parts
✔✔The following is a desirable property in a refrigeration - ✔✔High latent heat
✔✔The cooling medium for an evaporative condenser is: - ✔✔Air and water
✔✔The ratio of the actual pressure of water vapor in the atmosphere to the saturated
pressure of give temperature is: - ✔✔Relative humidity
✔✔The only refrigerant/ temperature chart available to a refrigerant engineer list the
temperature is degrees Celsius if the chart indicates a Celsius temperature of 4 degrees
to equivalent to F: - ✔✔39.2 degrees
✔✔A refrigerant engineers was instructed to charge of 60 ton plant with R134A
refrigerant. the refrigerant engineer will most likely find the charging valve on the -
✔✔Low pressure side of the system
✔✔A refrigerant engineer verifies that a chilled water pump is cavitating. of the following
the most likely cause for this condition is: - ✔✔Water leaks through the mechanical
seals
✔✔There is a decrease in the efficiency of a reciprocating compressor. this most likely
caused by: - ✔✔Leaking suction valve
✔✔The suction and discharge valve of the reciprocating compressor are mounted as
follows: - ✔✔Discharge valves on top of the valve plate and suction valve below
✔✔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. while making your rounds you notice that the discharge pressure
of your condenser water pumps is significantly lower than normal. which of the following
action would you avoid taking: - ✔✔Put on an additional surface condenser pump and
lower the chilled water set point
✔✔A water pump is discharge against head 92 feet of water, this is approximately to a
pressure of: - ✔✔40 psi
