Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: An air conditioning system rated for 36,000 BTU's is equivalent to
12,000 tons of cooling
two tons of cooling
one ton of cooling
three tons of cooling
2: What is the amp draw of a 40 VA transformer at 24 volts
1,000 amps
1K amps
1.6 amps
106 amps
3: What is the temperature that a liquid and a vapor can exist in equilibrium called?
Saturated temperature
Critical temperature
Wet bulb temperature
Dry bulb temperature
4: 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
5: How many volts would you read on a 480V system phase to phase?
1/3 the voltage
0
480
277
6: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
660 lbs
500 lbs
55 lbs
330 lbs
7: What is NOT a positive displacement compressor.
Centrifugal
Rotary
Reciprocating
Scroll
8: Increasing superheat will do what to your frost line?
Decrease
Could either increase or decrease depending on the load conditions
Increasae
Nothing
9: 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
first disconnect in
breaker panel in
24 volt secondary side of the Class 2 transformer to the thermostat
load-side of the contactor in
10: Systems containing more than 110 pounds must have stop valves located at the
compressor suction inlet
compressor discharge outlet
receiver inlet and outlet
All of the above
11: Heat transferred by conduction from one body to another is done via:
gas
liquid
solid
All of the above
12: Horizontal piping should be run level.
Yes, if the condenser is located above the evaporator
True
False
No, unless the supervisor on the job says so.
13: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
50
25
22
66
14: Electricity involves the movement of electrons in atoms
True
False
15: Refrigerant restricted in 2004 but used for transition for decades:
R-134A
R-123
R-22
R-11
16: A declaration test is needed when the system contains more than
120 lbs
65 lbs
55 lbs
110 lbs
17: 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
pick-up voltage
run voltage
boost voltage
lift voltage
18: Bubbles in the liquid line sight glass could be caused by
plugged drier
leaking discharge valves in the compressor
overcharge of oil
bad low pressure switch
19: Pressure relief valves shall be marked with the data from
Section IV Division of the ASME Boiler & Pressure Code
Section I Division VIII of ASME Boiler & Pressure Code
Section XIII Division of the ASME Boiler & Pressure Code
Section VIII Division of the ASME Boiler & Pressure Code
20: The heat picked up in the evaporator must equal to
the heat of compression
the heat gained by the condenser
the heat giving by the condenser
the heat lost by the medium being cooled
21: Stop valves shall not be permitted between the system and the
relief valve
bleed valve
service valve
condenser
22: R-717 is
ammonia
trichloromethane
water
carbon dioxide
23: 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
Place sign, check for leaks, insulate
Nothing must be done
24: one BTU equals
12,000 hp
31.4 hp
3.41 hp
Pi
25: A plug containing an alloy that will melt at a specific temperature to relief pressure is a