Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: A pressure relief should be located at least _______ from windows and doors.
30'
20'
15'
25'
2: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
Solenoid valve
EEV
CPR valve
EPR valve
3: 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.
226 psig, 68 psig
257 psig, 77 psig
455 psig, 185 psig
350 psig, 120 psig
4: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
green
blue
orange
red
5: The equivalent length of pipe in a water piping system is
the total length of pipe plus equivalent of fittings multiplied by 2.31
the total length of pipe as you would measure it plus 25% for fittigns
the total length of pipe plus equivalent-length of fittings
the total length of pipe as you would measure it
6: A class A3 refrigerant is considered
non-toxic but highly flammable
non-toxic and non-flammable
toxic and non-flammable
toxic and somewhat flammable
7: What must be done to refrigerant pipes before being buried?
Encased
Leaked checked
Coated
Certified
8: The color code of a tank of ammonia is
light green
lavender
white
silver
9: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
institutional occupancy
public assembly occupancy
commercial occupancy
illegal occupancy
10: Ammonia vaporization takes place at what temperature?
-32F
-110F
-460F
-28F
11: Who authorizes changes to the safety codes?
Board of Boilers
Person who pulled the permit
Person in charge of the facility
Contractor who last serviced the system.
12: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
When it's cold out
When there is a malfunction on the high side
When its warm out
All of the above
13: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
3/4"
1/2"
3/8"
5/8"
14: A professional or office building would be considered what type of occupancy?
mercantile
business
commercial
public assembly
15: What is the typical air conditioning operating pressures for R-22?
60 psi suction 210 psi discharge
25 psi suction 125 psi discharge
105 psi suction 340 psi discharge
None of the above
16: Evaporators within 18" of a heating coil must be equipped with a
low limit control
zone valve
high limit control
pressure relief device
17: What type of pressure relief device is used on a CO2 system?
Rupture disk
Glove valve
Fusible plug
Gate valve
18: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
Because it's a non-flammable refrigerant
Because it's water
Because it's cheap
R-718 is not rated unlimited because it's a dangerous refrigerant
19: The two float-type metering devices are the
high-side float and the low-side float
liquid float and the vapor float
liquid float and the low-side float
vapor float and the low-side float.
20: One ton of refrigeration is defined as ______ btu/minute.
12,000
720,000
200
60
21: Adjusting the spring pressure on a TXV
changes superheat
adjusts the bulb charge
changes subcooling
makes no difference
22: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
3.0, 3.5
6.6, 6.6
2.5, 3.0
2.5, 2.5
23: How many closing forces operate a thermostatic expansion valve?
2
4
1
3
24: Which of the following controllers would you expect to be most sensitive to temperature changes?
aquastat
immersion controller
low voltage t-stat
line voltage t-stat
25: Booster compressors connect to the ____ side of the compressor