MA Refrigeration License Exam || with 100% Errorless Solutions.
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What device measures the specific gravity of a substance? correct answers Hydrometer
If a low-pressure chiller has a low-side leak, which of the following will most likely result? correct answers High suction pressure and High discharge pressure
A pressure vessel having an inside diameter of ...
what device measures the specific gravity of a sub
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Solutions.
What device measures the specific gravity of a substance? correct answers Hydrometer
If a low-pressure chiller has a low-side leak, which of the following will most likely result?
correct answers High suction pressure and High discharge pressure
A pressure vessel having an inside diameter of 6" or less shall be sufficient to withstand
____times the pressure of the saturation temperature of the refrigerant or ____times the critical
pressure of the refrigerant, whichever is less correct answers 2.5, 2.5
Oils, classified as to source, are correct answers Animal, vegitabal, mineral
Low pressure systems have what kind of compressor? correct answers Centrifugal
What will occur if the strong solution in an absorption chiller becomes too strong? correct
answers Machine will stop cooling and the solution will crystalize
If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it
shall have the capacity to correct answers Receive the pumpdown charge
How are refrigerant blends classified? correct answers Based on worst case fractionation
Emergency shutdown procedures, including precautions to be observed in case of a breakdown
or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near
as possible to the correct answers Compressor
_____ and its alloys are suitable for use with ammonia systems correct answers Aluminium
How many gallons of water do you need per pound of ammonia? correct answers 1
Liquid level gauges must be provided with what? correct answers Automatic shutoff valves
The rupture disc on a low-pressure chiller typically releases pressure at correct answers 15 Psi
R-12. R-22, and R-40 are considered Group I refrigerants. correct answers False
1 HP = ____ Watts? correct answers 746 watts
The actual expansion curve of compressor follows most nearly which one of the following
correct answers Adiabatic
The color code of a tank of ammonia is correct answers Silver
, What is the state of the refrigerant leaving the evaporator? correct answers Low temp
superheated vapor
Low temperature systems should have what? correct answers Low pour point
Which of the following most closely represents the concentration of Li-Br in a absorption
system? correct answers 60% Li-Br / 40% Distilled water
Which refrigerant(s) is an HFC? correct answers 410A
If the suction pressure is low and the evaporator temperature high, the cause will be a? correct
answers Starved evaporator
An accumulator can be located between the correct answers Evaporator and compressor
The pressure relief device of a positive displacement compressor shall discharge in the
______________or in accordance with 9.7.8 correct answers Low side
R-123 belongs to Group correct answers B-1
A secondary coolant is defined as correct answers Any liquid used for the transmission of heat
without a change of state in A/C refrigeration systems having flash point above 150F
To determine the pump size needed for an open cooling tower system, the following must be
known, correct answers GPM and friction head
Instead of using a compressor, an absorption air-conditioning chiller uses which of the following
as its driving force? correct answers Heat
The oil separator is always inserted in the system correct answers Discharge line
Class T machine room correct answers No flame producing apparatus perminantly installed
When testing systems using non-positive displacement compressors, the entire system shall be
considered for test purposes as the low side. correct answers True
A person holding a license as a refrigeration technician may connect or disconnect for the
purpose of installation, repair, or replacement, any electrical device or control to be a part of a
refrigeration or air conditioning system, from the correct answers First Disconnect in
Joints in piping for refrigeration containing parts must withstand temperatures of ___? correct
answers 700F
Trichlorotrifluoromethane correct answers R-113
The difference between saturated liquid and saturated vapor is correct answers Heat
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