Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: What are the three components of a transformer?
Primary core, secondary coil, and high and low voltage connectors.
Contacts, secondary coil, and core
Primary coil, secondary coil, and copper contacts
Primary coil, secondary coil, and core
2: What kind of material can't be used on the outlet of a relief valve?
PVC
Stainless Steel
Aluminum
Copper
3: Which of the following controllers would you expect to be most sensitive to temperature changes?
line voltage t-stat
low voltage t-stat
immersion controller
aquastat
4: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
orange
red
blue
green
5: Which occupancy can ammonia be used in?
commercial
depends on the quantity of freon
industrial
redifential
6: What is potential measured in?
Amps
Henrys
Ohms
Volts
7: Usually dry bulb temperature is
same as wet bulb temperature
not important and shall be ignored
higher than wet bulb temperature
lower than dry bulb temperature
8: What pipe can not be used for refrigeration?
L
M
N
K
9: How much clearance do you need around the perimeter of electrical panels?
12"
24"
36"
18"
10: What will occur if the strong solution in an absorption chiller becomes too strong?
The machine will stop cooling and the solution will evaporate.
The machine will cool excessively as the solution crystallizes.
The machine will stop cooling and solution will crystallize
The machine will cool excessively as the solution evaporates
11: Where is the high-side float located on a chiller system?
flash line
inside the chiller barrel
liquid line
discharge line
12: Low pressure systems have what kind of compressor?
Rotary
Reciprocating
Scroll
Centrifugal
13: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
fusible plug
fusion plug
relief plug
rupture plug
14: Dual-pressure relief devices should be installed on
vessels of 3 cubic feet or more
vessels of 10 cubic feet or more
vessels of 10 cubic feet or less
vessels of 3 cubic feet or less
15: The heat picked up in the evaporator must equal to
the heat giving by the condenser
the heat of compression
the heat gained by the condenser
the heat lost by the medium being cooled
16: One ton of refrigeration is defined as ______ btu/minute.
12,000
720,000
60
200
17: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
70.8 psig
43.3 psig
66.1 psig
50.2 psig
18: A motor starter contains a thermal overload and a
solenoid
3-way relay
transformer
contactor
19: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
color-coded glass to determine type of refrigerant
moisture indicators
automatic closing shut-off valves
All of the above
20: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
66
50
25
22
21: If an oil’s floc point is too high, which of the following could occur?
compressor burn out
plugged expansion valve
low head pressure
high suction pressure
22: What type of oil is used in R-410A systems?
polyolester (POE)
mineral oil
polyalkylene glycol (PAG)
naphthene
23: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
600 watts
746 watts
1000 watts
5KW
24: What type of pressure relief device is used on a CO2 system?
Rupture disk
Glove valve
Fusible plug
Gate valve
25: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?