Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: How many CFMs are required per square foot of commercial office occupied space
5 CFM
20 CFM
.5 CFM
15 CFM
2: A self contained system
is a unit system Group I refrigerants only
is a complete factory made and tested system
is any system or part of a system used to increase evaporation by expansion or vaporization
is a unit system Group II refrigerants only
3: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
over pressure protection and a rupture disc
Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
over pressure protection
over pressure protection as well as a temperature protection device
4: What refrigerant has zero ozone depletion
HFC
CFC
HCFC
None of the above
5: Pressure is equivalent of
Force
Force / Area
Force X Area
Area X Force
6: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
the atmosphere
a de-pressurized recovery tank with a silver top and yellow bottom
a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
All of the above
7: The best way to determine the voltage requirement for an electrical component is to
determine the capacity of the service panel
read the nameplate data
check with the utility company
read the voltage with a mulitmeter
8: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
110
330
6.6
1,000
9: Which winding have the most turns?
they have equal amount of turns
Start
run
depends on the motor phase
10: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
True
False
11: Name an HCFC refrigerant(s):
R-22
R-123
R-11
both a & b
12: When the compressor is below the condensor
traps are not needed on this type of system
traps are needed on the discharge line
traps are needed on the suction line
traps are needed on the oil return line
13: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
sight glass, weight, paper method, and frost line.
sight glass, weight, pressure, and frost line
sight glass, weight, pressure, and dipstick
Buss-eye, weight, pressure, and frost line
14: Refrigerant restricted in 2004 but used for transition for decades:
R-22
R-123
R-11
R-134A
15: No open flames are allowed in the machinery room unless?
Only when combustion air is provided from outside of the machinery room
Never can be allowed
Approved by the authorized person
Approved by the installing contractor
16: Ammonia can come in contact with _______ ?
Copper tubing
Aluminum
Brass
Copper
17: Name a CFC refrigerant(s):
R-11
R-12
R-123
both a & b
18: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
it would make the condenser more efficient
it would make the condenser less efficient
it would cause the condenser to sweat
it would have no effect on the condenser
19: The main cause of enacting the "no vending rule" of July 1st 1992 was
global warming potential
ozone depletion
both a & b
None of the above
20: All electrical work done on refrigeration systems must comply with
OSHA
NEC and Massachusetts Modifications
ASHREA-15 Section 9.2.1
Department of Energy
21: What is the amp draw of a 40 VA transformer at 24 volts
1,000 amps
1K amps
1.6 amps
106 amps
22: Which is the lowest vacuum?
10 psia
5 psig
1,000 Microns
5" hg
23: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
100
90
80
110
24: What type of copper is not permitted on refrigeration systems?
Type M
Type N
Type L
Type K
25: While the system is operating, the discharge line should be