Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: What kind of system uses two different refrigerants in separate systems dependent on each other?
Low pressure
Simple
R-414B
Cascade
2: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
Flush with R-718
Flush with R-11
Flush with RX-11
Flush with ammonia
3: The generator shell contains the
condenser and the generator
condenser, the evaporator, and the generator
condenser and the absorber
evaporator and the absorber
4: What kind of material can't be used on the outlet of a relief valve?
Aluminum
Stainless Steel
PVC
Copper
5: A motor starter is a device that includes an overload and a _______?
contactor
2-pole contacts
duel-coil
all of the above
6: Increasing superheat will do what to your system?
Nothing
Increase gas flow
Decrease liquid flow
Increase liquid flow
7: Pressure is equivalent of
Force / Area
Force
Area X Force
Force X Area
8: How many refrigerant classifications are there for toxicity?
5
3
1
2
9: Where a refrigeration or air conditioning system is installed,
the form or certificate shall be authorized by the Department of Public Safety
it shall not be operated below prescribed pressuers
A field inspection shall be made before it is put into service
The company who installed the system must notify the fire department in the jurisdiction where installed
10: Ammonia (NH3) is a group III refrigerant
True
False
11: What is used to check very low air pressures in air conditioning duct?
Vacuum gauge
Barometer
Anemomter
Manometer
12: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
15
55
50
75
13: Clearance volume
has no effect on compressor capacity
affects compressor capacity
is the same on all compressors
varies depending on compressor speed
14: What is an egress?
A code violation
An escape route
A valve put on the low side of the system to prevent frosting
An entrance or exit
15: Can you use Ammonia in industrial applications?
Yes, always
When mixed with R-718
Yes, Under certain condidtions
No, never
16: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
CO Sensing
phosgene gas sening
A group sensing
refrigerant sensing
17: Start to Run windings will have what resistance?
All will be at equal values
The most resistance value
The least resistance value
Somewhere between the actual start winding and run winding resistance value
18: What is absolute humidity?
the amount of moisture in the air per one pound of 50% RH air
the amount of moisture in the air in grains of cubic feet of volume
the amount of moisture in the air in grains of square feet of volume
none of the above
19: Name a CFC refrigerant(s):
R-11
R-12
R-123
both a & b
20: In a system designed for sub-zero ambient temperatures, what must be added?
Nitrogen
Booster compressor
Low-ambient kit
Infrared dye for leak identification
21: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
public assembly occupancy
commercial occupancy
illegal occupancy
institutional occupancy
22: Ammonia systems use ____ pressure to adjust oil pressure
air
stream
liquid
discharge
23: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
ammonia
trichlorotrifluoromethane
methyl chloride
R-718
24: 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.
2.5, 3.0
2.5, 2.5
3.0, 3.5
6.6, 6.6
25: Two systems using separate refrigerants that are superimposed upon one another is called