Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Direct systems using Group II refrigerants
shall be installed per instruction of the AHJ
shall not be used for air condition for human comfort
shall be allowed to be used for human comfort.
shall be installed in Class T machinery rooms
2: Horizontal piping should be run level.
False
Yes, if the condenser is located above the evaporator
No, unless the supervisor on the job says so.
True
3: The normal operating evaporator temperature of R-410A for air conditioning is typically
158F
32F
155F
45F
4: Who is permitted to access a refrigeration machine room?
Contractors only
Anyone, it's a completely safe area
Any employee
Authorized persons only
5: What chemical in the refrigerant set off the leak detection alarm?
Fluorine
Chlorine
Both A and B
none of the above
6: What should never be used in pressure testing refrigeration systems?
Oxygen
Compressed air
Nitrogen
Both a and b
7: The first step in mechanical refrigeration is
expansion
compression
evaporation
condensation
8: How many groups of refrigerants are there?
7
5
1
3
9: Indirect systems using Group II refrigerants
shall be used in refrigeration system less than 1,000 lbs
shall be used for mechanical equipment only
shall be used in refrigeration system in excess of 1,000 lbs
shall have all refrigerant containing parts except piping, installed in a Class T machine room
10: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
80%
99%
90%
75%
11: When should a relief valve start to function?
10 psi before it's set pressure
At it's set pressure
Two times it's working pressure
Before the purge station discharges
12: 746 watts is equal to
1 hp
10 hp
Pi
100 hp
13: Industrial occupancy is
a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
Both a and b are correct
14: The high side float assembly meters refrigerant into the evaporator through the
lower chamber of the low side
upper chamber of the low side
lower chamber of the high side
upper chamber of the high side
15: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
lower
higher
the same
there is no Group B1 refrigerants
16: Liquid level gauges must be provided with what?
A low level mark
A red line
A relief valve
Automatic shut-offs
17: When can 50/50 solder be used?
in the low side
in the high side
liquid and suction lines
none of the above.
18: Refrigeration piping before being buried shall be
leak tested
encased in pipe duct
pressure tested
All of the above
19: Which of the following is not an air velocity meter?
Hydrometer
Anemotherm
Anemometer
Velometer
20: What will occur if the strong solution in an absorption chiller becomes too strong?
The machine will cool excessively as the solution crystallizes.
The machine will cool excessively as the solution evaporates
The machine will stop cooling and the solution will evaporate.
The machine will stop cooling and solution will crystallize
21: Can you use Ammonia in industrial applications?
When mixed with R-718
Yes, Under certain condidtions
Yes, always
No, never
22: Oils, classified as to source, are
animal, vegetable, and mineral
naphthalene, paraffin, and castor
naphthalene, mixed, and paraffin
animal, vegetable, and castor
23: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
ammonia
methyl chloride
trichlorotrifluoromethane
R-718
24: Pressure vessels nameplate markings must be compliant with the
ASHRAE 34 Standards
CMR-588 & CMR-528
ASME Boiler and Pressure Vessel Code
All of the Above
25: A 3-cubic foot receiver must have what type of relief valve?