Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: The gauge thickness required on a CO2 tank construction is
1/8"
3/32"
1/16"
5/16"
2: 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
3: Humidity can be sensed with
bimetal
pressure bellows
thermometer
human hair
4: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
100
50
24
75
5: A cross charged power element on an expansion valve would normally be used in what temperature range?
0F-38F
-40F to 0F
-100F to -40F
30F to 50F
6: Floc point is
the lowest temperature at which dissolved waxes and solids begin to solidify in a system
the highest temperature at which dissolved waxes and solids begin to solidify in a system
the highest temperature at which dissolved waxes and solids begin to separate in a system
the lowest temperature at which dissolved waxes and solids begin to separate in a system
7: What pipe can not be used for refrigeration?
L
K
N
M
8: R-22 falls under which safety classification?
A-2
B-1
B-2
A-1
9: What is the boiling point of refrigerant governed by?
Condenser sub-cooling
Evaporator temperature
Compressor RPM's
P&T relationship
10: NH3 is
ammonia
R-508A
R-718
lithium bromide
11: The high side float assembly meters refrigerant into the evaporator through the
upper chamber of the low side
lower chamber of the low side
lower chamber of the high side
upper chamber of the high side
12: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
run voltage
lift voltage
boost voltage
pick-up voltage
13: What is the refrigerant chlorodifluoromethane?
R-134a
R-12
R-22
R-123
14: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
22
66
25
50
15: Name three things that must be done when changing refrigeration lubricant?
You can't change lubricants.
Make sure it's compatible, notify owner, notify AHJ
Nothing must be done
Place sign, check for leaks, insulate
16: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
fusible plug
relief valve
rupture disc
all of the above
17: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
10
15
24
18
18: R-11 belongs to Group
B-3
A-1
B-1
A-2
19: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
EPR valve
Solenoid valve
CPR valve
EEV
20: Defined process piping by code CMR (528)
Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
Any piping in an industrial space
Any piping in an industrial or commercial space
All of the above
21: Gauge pressure is
Force of pressure above that of atmosphere
Absolute pressrue
Barometric pressure
Atmospheric pressure
22: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
checking the level of refrigerant in the system
testing for oil in the system
testing for moisture in the system
none of the above
23: What is the voltage of each leg of a 480 Volt three-phase motor?
208v
240v
277v
120v
24: How much refrigerant can be stored in a mechanical room outside of the system?
150
200
330
100
25: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
over pressure protection as well as a temperature protection device