FDNY Z51 RMO PAPER ACTUAL QUESTIONS AND
ANSWERS RATED A+
✔✔Water and moisture is a 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 notices 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 that: - ✔✔There is not enough refrigerant in the
system
✔✔While doing a routine line inspection, the engineer notices the bulk of the TXV on
the floor. The refrigerant engineer should attach bulb at the: - ✔✔The outlet end of the
coil
✔✔To convert water at 32 degrees F 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 given temperature is? - ✔✔Relative humidity
, ✔✔The only refrigerant/temperature chart available to a refrigerant engineer lists the
temperature is degrees Celsius. If the chart indicates a Celsius temperature of 4
degrees to equivalent to F - ✔✔39.2 degrees
✔✔A refrigerant engineer was instructed to charge a 60 ton plant with R-134A
refrigerant. The refrigerant engineer will most likely find the charging valve on the: -
✔✔Low pressure side of the system
✔✔A refrigerant engingeer 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 an decrease in the efficiency of a reciprocating compressor. This mostly
likely caused by? - ✔✔Leaking suction valve
✔✔The suction and discharge valve of the reciprocating compressor are mounted as
follows: - ✔✔Discharge valve 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 noticed that the discharge
pressure of your condenser water pump is significantly lower than the normal. Which
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
✔✔Which of the following will connect to the middle port on a gauge manifold? -
✔✔Vacuum pump
✔✔The most important reason for installing a muffler in reciprocating refrigerant
machine is? - ✔✔To contain the compressor pulsation noise
✔✔Of the following, the statement that most accurately characterizes a hermetic
compressor is that it: - ✔✔Will have both the compressor and motor enclosed is gas
tight housing
✔✔In the picture, the valve is in what position - ✔✔The valve is cracked open
✔✔What is the order of components on the liquid line of reciprocating system from the
condenser? - ✔✔King valve, filter drier, solenoid valve, sight glass
ANSWERS RATED A+
✔✔Water and moisture is a 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 notices 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 that: - ✔✔There is not enough refrigerant in the
system
✔✔While doing a routine line inspection, the engineer notices the bulk of the TXV on
the floor. The refrigerant engineer should attach bulb at the: - ✔✔The outlet end of the
coil
✔✔To convert water at 32 degrees F 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 given temperature is? - ✔✔Relative humidity
, ✔✔The only refrigerant/temperature chart available to a refrigerant engineer lists the
temperature is degrees Celsius. If the chart indicates a Celsius temperature of 4
degrees to equivalent to F - ✔✔39.2 degrees
✔✔A refrigerant engineer was instructed to charge a 60 ton plant with R-134A
refrigerant. The refrigerant engineer will most likely find the charging valve on the: -
✔✔Low pressure side of the system
✔✔A refrigerant engingeer 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 an decrease in the efficiency of a reciprocating compressor. This mostly
likely caused by? - ✔✔Leaking suction valve
✔✔The suction and discharge valve of the reciprocating compressor are mounted as
follows: - ✔✔Discharge valve 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 noticed that the discharge
pressure of your condenser water pump is significantly lower than the normal. Which
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
✔✔Which of the following will connect to the middle port on a gauge manifold? -
✔✔Vacuum pump
✔✔The most important reason for installing a muffler in reciprocating refrigerant
machine is? - ✔✔To contain the compressor pulsation noise
✔✔Of the following, the statement that most accurately characterizes a hermetic
compressor is that it: - ✔✔Will have both the compressor and motor enclosed is gas
tight housing
✔✔In the picture, the valve is in what position - ✔✔The valve is cracked open
✔✔What is the order of components on the liquid line of reciprocating system from the
condenser? - ✔✔King valve, filter drier, solenoid valve, sight glass
