Z-51, 140 Exam Questions and Complete Solutions

Z-51, 140 Exam Questions and Complete Solutions A refrigerant engineer verifies that a chilled water pump is cavitating. of the following the most likely cause for this condition is: - Answer: Water leaks through the mechanical seals There is a decrease in the efficiency of a reciprocating compressor. this most likely caused by: - Answer: Leaking suction valve The suction and discharge valve of the reciprocating compressor are mounted as follows: - Answer: 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: - Answer: 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: - Answer: 40 psi Which of the following will connect to the middle port on a gauge manifold? - Answer: Vacuum pump The most important reason for installing a muffler in a reciprocating refrigerant machine is: - Answer: To contain the compressor pulsation noise Of the following, the statement that most accurately characterize a hermetic compressor is that it: - Answer: Will have both the compressor and motor enclosed is gas tight housing In the picture the valve is in what position (45 degree angle to the left) - Answer: The valve is crack open What is the order of components on the liquid line of a reciprocating system from the condenser to the TEV? - Answer: King valve, filter drier, solenoid valve, sight glass A high-side float valve is used to maintain: - Answer: Constant level of refrigerant in the evaporator Picture of pump: - Answer: Ninety degree reducing elbow, pump suction, pump casing, pump discharge, check valve Picture of compressor: - Answer: Oil charging port allows for the addition and removal of oil from the compressor A facility has failed to maintain water treatement to a refrigerant system: - Answer: Increase in the condenser pressure Which of these compressors is not a positive displacement type compressor? - Answer: Centrifugal Where is emergency power not required according to code? - Answer: Data centers What is the most widely used regulation book by operating engineers is? - Answer: EPA What type of refrigerant do you need FDNY approval for? - Answer: Propane Centrifugal pressure is determined by? - Answer: Speed of motor