Which of the following cannot be used as a desiccant in a refrigerating system?
A) Drierite
B) Calcium oxide
C) Activated alumnia
D) Soda lime
Which of the following best describes the function of an accumulator?
A) Similar to that of an analyzer in an absorption system
B) Prevent solids from entering the compressor
C) Prevent liquid from entering the compressor
D) Increase refrigerant effect
A scale trap is installed on the suction line of a compression refrigeration system to remove foreign matter. This component is most effective when?
A) The plant is new
B) The plant has been shut down fro a long time
C) The plant is old
D) The plant efficiency starts to decrease
Which of the following arranges liquid line components in the correct order?
A) Solenoid, drier , sight glass, TEV
B) Drier, sight glass, solenoid, TEV
C) King valve, drier, solenoid ,sight glass, TEV
D) King valve, sight glass, drier, accumulator
The low-pressure side of a compression refrigeration system extends:
A) From the expansion valve to the compressor suction
B) From the king valve to the compressor suction
C) From the expansion valve to the discharge line
D) From the king valve to the discharge line
A silica gel dryer that has moisture laden may be reactivated by heating the desiccant for a period of four hours or more. At what temperature should the process take place?
A) 200 Deg. F
B) 700 Deg. F
C) 450 Deg. F
D) 850 Deg. F
Which of the following can be removed with out affecting a system's ability to maintain a continuous refrigeration process?
A) Compressor
B) Evaporator
C) Receiver
D) Suction and discharge piping
An R-22 refrigeration system contains a "liquid-moisture indicator". The indicator element of this device reveals the presents of moisture by:
A) Changing color
B) Setting off an alarm
C) Increase circulation of lubricating oil
D) Prevent condensation from forming on the cold metal surface
What is the reason for insulating the suction line of a compression system?
A) Prevent loss of refrigerant effect
B) Reduce compressor variation
C) Increase circulation of lubricating oil
D) Prevent condensation from forming on the cold metal surface.
What is the state of a refrigerant into and out of the compressor?
A) Low pressure vapor and exits as low pressure vapor
B) High pressure vapor and exits as low pressure vapor
C) Low pressure vapor and exits as high pressure vapor
D) High pressure vapor and exits as high pressure vapor
Which of the following arranges refrigeration components in the correct order?
A) Condenser, scale trap, receiver, TEV, evaporator, oil separator, compressor
B) Oil trap, condenser, receiver, TEV, evaporator, scale trap, compressor
C) Condenser, oil trap, receiver, TEV, evaporator, scale trap, compressor
D) Condenser, receiver, TEV,
In a reciprocating refrigeration system that uses an evaporative condenser, the muffler should be installed between the:
A) Evaporator and compressor
B) Receiver and expansion valve
C) Compressor and condenser
D) Receiver and condenser
What is the primary reason for running the suction and liquid lines in physical contact with one another?
A) Separate oil from the refrigerant in the suction line
B) Reduce installation cost
C) Super heat liquid refrigerant in the liquid line
D) Sub-cool the refrigereant in the liquid line
The purpose of installing a filter drier in the liquid line is to:
A) Remove heavy particles from the refrigerant
B) Remove moisture
C) Remove acids
D)All of the above
Which of the following best describes the temperature of a sub-cooled refrigerant?
A) Above the saturation temperature
B) At the saturation temperature
C) Bellow the saturation temperature
D) Above the condensing temperature
Loss of the liquid seal indicates which of the following conditions?
A) High head pressure
B) Shortage of refrigerant
C) Low evaporator pressure
D) Dirty filter dryer
The refrigeration process is made possible by boiling (vaporizing) refrigerant. For what reason is it super heated?
A) Absorb a greater quantity of heat
B) Prevent condensate from forming on the suction line
C) Maximize evaporator efficiency
D) Protect the compresor
Which of the following describes the process that causes refrigerant to absorb additional heat energy as it travels through the compressor?
A) High head pressure
B) Heat of compression
C) Compressor super heating
D) Ambient overload
The amount of super heat being produced in an evaporator can be determined by:
A) Subtracting the measured temperature from the saturation temperature
B) Subtracting the saturation temperature from the measured temperature
C) Multiplying the refrigerating effect by the quantity (pounds) of a refrigerant in the system
D) Adding the s
Refrigeration mufflers even out the pulsations of high pressure vapor as they exit a reciprocating compressor. In doing so, they attenuate noise and limit vibration. What is the best location for this auxiliary component to be installed?
A) In the discharge line as far from the compressor as possible
B) In the discharge line as close to the compressor as possible
C) Midway between the compressor and condenser
D) At any location in the discharge line