Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Name a CFC refrigerant(s):
R-11
R-12
R-123
both a & b
2: A motor starter is a device that includes an overload and a _______?
contactor
2-pole contacts
duel-coil
all of the above
3: Refrigeration piping before being buried shall be
leak tested
encased in pipe duct
pressure tested
All of the above
4: How can you test mechanical strength of an electrical connection?
measure ohms with an electrical meter
measure voltage across the connection
attempt to pull the wire from the connector by hand
none of the above.
5: In a motor, an internal overload might open if
there's an open start winding
there was a high pressure refrigerant was used for a low pressure system.
there's a direct short
there's an excess current draw through the motor
6: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
strong solution
concentrated solution
weak solution
absorbed solution
7: Pressure vessels with an internal volume of 3 cubic feet or less
shall use pressure relief devices
shall use pressure relief devices or fusible plugs
shall use fusible plugs
do not need pressure relief protection
8: What does an anemometer measure?
voltage
temperature
velocity
amperage
9: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
liquid line that is too small
shortage of refrigerant
liquid line that had too high vertical lift
All of the above
10: 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
11: A start capacitor is wired in _____ with the start windings.
series
parallel
series-parallel
junction
12: Which refrigerant class listed below is the most flammable?
A-1
A-3
C-3
B-2
13: The certificate of inspection
shall be posted and protected from dirt, water, and other elements
shall be authorized by a notarized insurance company
shall be $20 and an additional fee of $1 for each tone above 20 tons
shall be posted on the compressor shell or electrical panel at the unit
14: Low pressure systems have what kind of compressor?
Scroll
Reciprocating
Centrifugal
Rotary
15: 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
lift voltage
boost voltage
run voltage
pick up voltage
16: Refrigerant restricted in 2004 but used for transition for decades:
R-22
R-11
R-134A
R-123
17: R-11 has the greatest corrosive effect on
Copper
Aluminum
Magnesium
Bronze
18: Who approves containers for refrigerants?
D.O.E
D.O.D
D.O.T
E.P.A
19: What type of material can't be used on the outlet of a relief valve?
Stainless steel
PVC
Magnesium alloy
Copper
20: An air conditioning system rated for 36,000 BTU's is equivalent to
three tons of cooling
two tons of cooling
one ton of cooling
12,000 tons of cooling
21: 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
load-side of the contactor in
breaker panel in
24 volt secondary side of the Class 2 transformer to the thermostat
22: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
38
58
88
96
23: 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
not enough oil in the system
oil in evaporator
low head pressure
24: A single pole-double throw switch used how many wires excluding the ground wire?
two
five
three
four
25: Electricity involves the movement of electrons in atoms