Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: 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
75
55
50
2: How many forces operate a thermostatic expansion valve?
4
2
3
1
3: R-12. R-22, and R-40 are considered Group I refrigerants.
True
False
4: At higher altitudes, the boiling point of refrigerant is
the same
lower
equal to the coefficient of water at 32F
higher
5: What would be the classification of a prison?
Institutional
Place of assembly
Large mercantile
Industrial
6: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
low pressure
critical pressure
high pressure
design pressure
7: Refrigerant restricted in 2004 but used for transition for decades:
R-11
R-22
R-134A
R-123
8: What type refrigerant is NOT ozone depleting?
CFC
Halon
HFC
HCFC
9: NH3 is
R-718
ammonia
R-508A
lithium bromide
10: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is
it is hydroscopic
it traps moisture
viscosity
all of the above
11: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
low side of the system
high side float assembly
cap tube
none of the above
12: Gauge pressure is
Absolute pressrue
Force of pressure above that of atmosphere
Barometric pressure
Atmospheric pressure
13: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
1%
4%
25%
2%
14: The oil separator is always inserted in the system
to prevent oil logging
in a cool spot
in the discharge line
where it can be easily serviced
15: On cooling towers, what causes the condenser water to drop
evaporation of the water droplets
sensible heat
ambient temperatures
tower fans
16: Ammonia belongs to Group
B-2
B-1
A-2
A-1
17: Where must a refrigeration contractor's license number be displayed?
Trucks, license plates, and uniforms
Trucks, invoices, and advertising
Truck, office, every job, and on all equipment
Uniforms, checks, and invoices.
18: A restaurant is classified as a
public assembly occupancy
mixed occupancy
commercial occupancy
large mercantile occupancy
19: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
the low-pressure side of the system
the high side of the system
the liquid receiver
both a and c are correct
20: How far from the window does a relief valve need to be according to ASHRAE-15?
At least 40'
At least 20'
At least 30'
There is no minimum for relief valve and windows.
21: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
350
50
100
550
22: Total heat of a substance is considered
enthalpy
sensible heat
specific heat
empathetical
23: What section governs pressure vessels?
Section ASHREA 34
Section 1 ASHREA 15 ASME fired
Section 8 ASHREA 15 ASME unfired
OSHA
24: A chiller entering and leaving temperature difference is?