Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Low ambient controls are used when
economizers are used
when systems run all year round
on air conditioning systems only
always
2: Pressure relief valves shall be marked with the data from
Section IV Division of the ASME Boiler & Pressure Code
Section XIII Division of the ASME Boiler & Pressure Code
Section I Division VIII of ASME Boiler & Pressure Code
Section VIII Division of the ASME Boiler & Pressure Code
3: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
22
50
25
66
4: What do you need to do when you install a new system?
Document the superheat and subcooling reading
Have it inspected
Insulate the suction line before you take a superheat reading
Add refrigerant
5: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
257 psig, 77 psig
455 psig, 185 psig
226 psig, 68 psig
350 psig, 120 psig
6: If two 500 ohm resistors are connected in series, the resistance will be
1000 ohms
500 ohms
20 ohms
200 ohms
7: Bubbles in the liquid line sight glass could be caused by
bad low pressure switch
leaking discharge valves in the compressor
overcharge of oil
plugged drier
8: If the spring is adjusted to increase the superheat, this new setting will
shorten the frost line
have no effect on the frost line
allow more liquid into the evaporator
lengthen the frost line
9: 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.
90
110
100
80
10: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
700F
1000F
600F
800F
11: What is Trichlorotrifluoromethane?
R-13
R-113
R-11
R-12
12: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
“U” or “UM”
“UL”
“UV”
“UM” and “UV”
13: When an electronic bridge is in balance the bridge output will be
0 volts
1 volt
15 volts
.01 volts
14: Pressure vessels having an inside diameter of 6” or less shall be protected by
a pressure relief device
Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
either a fusible plug or a pressure relief device
a fusible plug
15: The oil separator is always inserted in the system
in a cool spot
to prevent oil logging
in the discharge line
where it can be easily serviced
16: What section governs pressure vessels?
Section 1 ASHREA 15 ASME fired
Section 8 ASHREA 15 ASME unfired
OSHA
Section ASHREA 34
17: The discharge relief valve is located (9.4.6)
between the compressor and oil separator
between the compressor and the stop valve
between the compressor and reciever
on top of the condensor
18: At higher altitudes, boiling temperatures
increase
decrease
depends on the refrigerant
are unaffected
19: Class A refrigerants are considered
toxic
flammable
non-toxic
non-flammable
20: What must be done if refrigeration lines pass through a concrete floor?
insulated
leak checked
installed through a pipe casing
moisture barrier
21: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
Heat
Oil
Electricity
Air
22: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
lower
higher
the same
there is no Group B1 refrigerants
23: Refrigeration piping before being buried shall be
leak tested
encased in pipe duct
pressure tested
All of the above
24: Pressure vessels nameplate markings must be compliant with the
ASHRAE 34 Standards
CMR-588 & CMR-528
ASME Boiler and Pressure Vessel Code
All of the Above
25: What must be done to all doors and access points in duct work going through a mechanical room?