Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: All serviceable components of a refrigeration system shall be provided with
service manuals
safe access
manufactures instructions on start-up procedures
name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
2: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
240v
120v
208v
277v
3: The External equalizer of a TXV compensates for
pressure within the evaporator
pressure drop across the condenser coil
pressure within the system
pressure drop across the evaporator coil
4: Defined process piping by code CMR (528)
Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
Any piping in an industrial space
Any piping in an industrial or commercial space
All of the above
5: Low pressure systems have what kind of compressor?
Rotary
Scroll
Reciprocating
Centrifugal
6: How many opening forces operate a thermostatic expansion valve?
4
3
2
1
7: The instrument used to measure the specific gravity of absorption chiller solutions is the
Psychrometer
hydrometer
anemometer
refractometer
8: All electrical work done on refrigeration systems must comply with
Department of Energy
NEC and Massachusetts Modifications
ASHREA-15 Section 9.2.1
OSHA
9: What type refrigerant is NOT ozone depleting?
CFC
Halon
HCFC
HFC
10: What is Absolute Zero?
-773F
-640F
-400F
-460F
11: Before replacing a seized compressor, the _______ should be determinded.
designed head pressure
type of refrigerant
current draw
cause of seizure
12: The rupture disc on a low-pressure chiller typically releases pressure at
15 psig
0 psig
10 psig
5 psig
13: 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?
Moisture and air
Water and soap
Oil and water
Air and dirt
14: Name three things that must be done when changing refrigeration lubricant?
Nothing must be done
Place sign, check for leaks, insulate
Make sure it's compatible, notify owner, notify AHJ
You can't change lubricants.
15: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
16.64
6.830
34.15
3.415
16: On a single phase motor, when does the start winding cut out?
25% of its RLA speed
50% of its RLA speed
100% of its RLA speed
75% of its RLA speed
17: Which refrigerant is lighter than air?
R-134a
R-11
R-123
R-717
18: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
400
100
250
350
19: NH3 is
ammonia
lithium bromide
R-718
R-508A
20: A EPR valve is installed on what type of evaporators?
shell and tube evaporators
plate evaporators
high-temperature evaporators
low-temperature evaporators
21: What is the refrigerant dichlorodifluoromethane?
R-12
R-22
R-123
R-134A
22: When an electronic bridge is in balance the bridge output will be
0 volts
1 volt
15 volts
.01 volts
23: Industrial occupancy is
a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
Both a and b are correct
24: Ammonia vaporization takes place at what temperature?
-32F
-460F
-110F
-28F
25: An oil pressure safety switch should be set at