NYC RMO EXAM, CHAPTER 26 (Troubleshooting)
questions with verified answers
26.01.) While conducting a tour of the refrigeration plant, an operator notices a
significant increase in the amount of superheat in a particular reciprocating
system. Which of the following would be a possible cause for this condition?
Ans✓✓-Location of the thermal bulb
26.02.) In a high side float refrigeration system, what does frost on the suction
line indicate? Ans✓✓-There is an excess of refrigerant in the system
26.03.) Which of the following has a direct relationship to the amount of
refrigerant being metered into the evaporator? Ans✓✓-Desired coil temperature
26.04.) Adjusting the factory setting of a TEV will affect the amount of refrigerant
that the valve is supplying to the evaporator, what other condition will be
altered? Ans✓✓-Suction pressure
26.05.) Which of the following will cause high suction pressure, assuming all other
conditions are normal? Ans✓✓-TEV wide open
26.06.) If an evaporator system does not respond to adjustments of the expansion
valve, it may be due to? Ans✓✓-Oil logged evaporator
26.07.) A direct expansion evaporator is being used to maintain a temperature of
20 to 25 degrees F within a refrigerated compartment. The entire length of the
coil is frosted with the exception of the bottom rows. Which of the following
would cause this condition? Ans✓✓-Coil is being starved
, 26.08.) A dirty DX evaporator coil will have the same effect as which of the
following? Ans✓✓-Dirty media filter
26.09.) A system is cycling excessively, the crankcase temperature is high,
discharge pressure is low and suction pressure is high, what is a possible
explanation? Ans✓✓-Faulty compressor valves
26.10.) In a vertical single acting compressor it is noted that when the compressor
cycles on there is a loud pounding noise. Which of the following is a possible
explanation? Ans✓✓-Overcharge in the oil system
26.11.) If an R-12 single acting compressor had oil foaming in its crankcase, a
possible explanation would be? Ans✓✓-Sudden drop in crankcase pressure
26.12.) If a compressor is operated with the suction service valve closed and the
discharge service valve open, which of the following will take place? Ans✓✓-Non-
condensable gases may be drawn into the system
26.13.) A vertical single acting compressor has trunk type pistons. If the oil rings
leaked a possible result would be? Ans✓✓-Decreased capacity
26.14.) The following is an indication that a system's cooling tower is not
operating as designed. Ans✓✓-High head pressure
26.15.) Of the following conditions, the one that would not result in high
discharge pressure would be? Ans✓✓-Gas in the liquid line
questions with verified answers
26.01.) While conducting a tour of the refrigeration plant, an operator notices a
significant increase in the amount of superheat in a particular reciprocating
system. Which of the following would be a possible cause for this condition?
Ans✓✓-Location of the thermal bulb
26.02.) In a high side float refrigeration system, what does frost on the suction
line indicate? Ans✓✓-There is an excess of refrigerant in the system
26.03.) Which of the following has a direct relationship to the amount of
refrigerant being metered into the evaporator? Ans✓✓-Desired coil temperature
26.04.) Adjusting the factory setting of a TEV will affect the amount of refrigerant
that the valve is supplying to the evaporator, what other condition will be
altered? Ans✓✓-Suction pressure
26.05.) Which of the following will cause high suction pressure, assuming all other
conditions are normal? Ans✓✓-TEV wide open
26.06.) If an evaporator system does not respond to adjustments of the expansion
valve, it may be due to? Ans✓✓-Oil logged evaporator
26.07.) A direct expansion evaporator is being used to maintain a temperature of
20 to 25 degrees F within a refrigerated compartment. The entire length of the
coil is frosted with the exception of the bottom rows. Which of the following
would cause this condition? Ans✓✓-Coil is being starved
, 26.08.) A dirty DX evaporator coil will have the same effect as which of the
following? Ans✓✓-Dirty media filter
26.09.) A system is cycling excessively, the crankcase temperature is high,
discharge pressure is low and suction pressure is high, what is a possible
explanation? Ans✓✓-Faulty compressor valves
26.10.) In a vertical single acting compressor it is noted that when the compressor
cycles on there is a loud pounding noise. Which of the following is a possible
explanation? Ans✓✓-Overcharge in the oil system
26.11.) If an R-12 single acting compressor had oil foaming in its crankcase, a
possible explanation would be? Ans✓✓-Sudden drop in crankcase pressure
26.12.) If a compressor is operated with the suction service valve closed and the
discharge service valve open, which of the following will take place? Ans✓✓-Non-
condensable gases may be drawn into the system
26.13.) A vertical single acting compressor has trunk type pistons. If the oil rings
leaked a possible result would be? Ans✓✓-Decreased capacity
26.14.) The following is an indication that a system's cooling tower is not
operating as designed. Ans✓✓-High head pressure
26.15.) Of the following conditions, the one that would not result in high
discharge pressure would be? Ans✓✓-Gas in the liquid line
