Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: What pipe can not be used for refrigeration?
M
L
N
K
2: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
higher
the same
there is no Group B1 refrigerants
lower
3: Which of the following is NOT a positive displacement compressor?
scroll
reciprocating
centrifugal
screw
4: A declaration test is needed when the system contains more than
65 lbs
55 lbs
110 lbs
120 lbs
5: How far from the ground does a relief valve need to be?
At least 25' above grade
At least 20' above grade
Not more than 3' above grade
At least 15' above grade
6: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
24 volt secondary side of the Class 2 transformer to the thermostat
first disconnect in
breaker panel in
load-side of the contactor in
7: The location of the thermal bulb for the TXV on the evaporator effects
both the pressure and temperature in the feeler bulb
the amount of superheat required to operate the TXV
the amount of liquid in the evaporator
the amount of gas in the evaporator
8: Can you use Ammonia in industrial applications?
No, never
When mixed with R-718
Yes, always
Yes, Under certain condidtions
9: What effect does the temperature of air have on humidity?
warmer air holds more moisture then cooler air
cooler air holds more moisture then warmer air
air has no effect of humidity
none of the above
10: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
24,000 BTU
12,000 BTU
970 BTU
144 BTU
11: Which of the following most closely represents the concentration of Li-Br in a absorption system?
60% Li-Br, 40% distilled water
40% Li-Br, 60% tap water
40% Li-Br, 60% distilled water
50% Li-Br, 50% tap water
12: How many refrigerant classifications are there for flammability?
3
2
7
1
13: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
moisture in the system
low head pressure
oil in evaporator
not enough oil in the system
14: A moisture indicator must
change color when exposed to moisture
be yellow
be sight side up
be filled with liquid
15: What type of pressure relief device is used on a CO2 system?
Rupture disk
Fusible plug
Glove valve
Gate valve
16: All electrical work done on refrigeration systems must comply with
ASHREA-15 Section 9.2.1
OSHA
Department of Energy
NEC and Massachusetts Modifications
17: A start capacitor in series with a start winding will
increase the amp draw of the motor
increase running efficiency
decrease the amp draw of the motor
increase starting torque
18: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
no flames shall be permitted
the owner shall be informed
gas masks must be worn
explosion precautions must be taken
19: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
22
66
50
25
20: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
Foot valve
Muffler
Stop valve
Moisture indicator
21: Which refrigerant class listed below is the most flammable?
C-3
A-1
A-3
B-2
22: The principle used in continuous type absorption systems is
Boyle's Law
Charles's Law
Dalton's Law
Ohm's Law
23: R-22 is considered a(n)
HFC
HCFC
HCFCH
CFC
24: In a motor, an internal overload might open if
there's a direct short
there's an open start winding
there's an excess current draw through the motor
there was a high pressure refrigerant was used for a low pressure system.
25: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed