Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
36
48
18
24
2: one BTU equals
31.4 hp
12,000 hp
3.41 hp
Pi
3: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
When it's cold out
When there is a malfunction on the high side
When its warm out
All of the above
4: What is an example of institutional occupancy?
Hospital
Football stadium
Dorms
Shopping mall
5: 1 HP = ____ Watts?
3,412
3.1416
746
11,239
6: Which oil is hydoscopic?
SW30
polyolester
animal
mineral
7: The purpose of a receiver is
a vessel to store refrigerant outside the system
to increase the capacity that the system can hold
to use a a later date
all of the above
8: What is the typical air conditioning operating pressures for 410A?
60 psi suction, 210 psi discharge
25 psi suction, 125 psi discharge
105 psi suction, 350 psi discharge
None of the above
9: The solution that leaves the concentrator in an absorption chiller is referred to as the
strong solution
diluted solution
absorbed solution
weak solution
10: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
Heat
Electricity
Oil
Air
11: By using nitrogen within a pipe during brazing operation,
Exterior scale formation is minimized
The explosion hazard is confined
Copper oxide formation is prevented
Discoloration is prevented
12: If your suction line is warmer than the room temperature, this may indicate
below normal superheat
plugged air filter
a low charge
an over charge
13: Halogen refrigerants are corrosive to which type of metal?
copper
magnesium
black iron
stainless steel
14: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
25
20
15
10
15: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
drawing RLA and is running as it should
drawing LRA and is seized and should be replaced.
running hot
none of the above
16: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
True
False
17: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
there is no Group B1 refrigerants
higher
lower
the same
18: What is the state of the refrigerant leaving the evaporator?
a high temperature superheated vapor
a low temperature subcooled liquid
a high temperature subcooled liquid
low temperature superheated vapor
19: What is the refrigerant dichlorodifluoromethane?
R-12
R-134A
R-123
R-22
20: The heat picked up in the evaporator must equal to
the heat giving by the condenser
the heat lost by the medium being cooled
the heat gained by the condenser
the heat of compression
21: 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
22: The evaporator is a device to
store liquid refrigerant
absorb heat into the refrigeration system
Keep the compressor busy
remove heat from the refrigeration system
23: R-123 belongs to Group
B-2
B-3
B-1
A-3
24: What would be the classification of a church?
Institutional
Industrial
Place of assembly
Large mercantile
25: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
hold up to 110% of the pumpdown charge
release the charge when the pressure exceeds 310 psig or higher
Pumpdown procedures are not allowed with systems containing liquid recievers