Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: What is the amp draw of a 40 VA transformer at 24 volts
1,000 amps
1.6 amps
1K amps
106 amps
2: Electricity involves the movement of electrons in atoms
True
False
3: The Department that certifies the transportation of refrigerant is the
EPA
DOT
EPO
RSES
4: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
it would cause the condenser to sweat
it would have no effect on the condenser
it would make the condenser more efficient
it would make the condenser less efficient
5: R-22 falls under which safety classification?
A-1
B-1
A-2
B-2
6: Which of the following is NOT a positive displacement compressor?
scroll
screw
centrifugal
reciprocating
7: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
the atmosphere
a de-pressurized recovery tank with a silver top and yellow bottom
a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
All of the above
8: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
108
116
88
38
9: A relief valve discharge capacity is rated in
temperature minus pounds of air per second divided by release rate squared
Pounds of air per minute.
PSIA
PSIG
10: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
506v
550v
660v
None of the above
11: What must be done if refrigeration lines pass through a concrete floor?
moisture barrier
installed through a pipe casing
insulated
leak checked
12: What device should be used on low-temperature freezers?
oil separator
discharge muffler
high capacity TXV
hot-gas by-pass
13: Most CFC's are
flammable
toxic
inert
inert but toxic
14: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
CFC-11
Lithium bromide
HCFC-123
ammonia
15: Sensible heat is the heat added to a substance to
freeze it
change its state
raise its temperature
cause evaporation
16: A low oil switch is typically
manual reset
time-delay auto reset
automatic reset
non used on semi-hermetic compressors over 10 ton capacity
17: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
Flush with R-718
Flush with RX-11
Flush with ammonia
Flush with R-11
18: How many closing forces operate a thermostatic expansion valve?
3
4
1
2
19: Pressure vessels with an internal volume of 3 cubic feet or less
do not need pressure relief protection
shall use pressure relief devices
shall use pressure relief devices or fusible plugs
shall use fusible plugs
20: Fusible plugs must have what marked on them?
Melting temperature in F
Melting temperature in C
Opening pressure
All of the above
21: On a pumpdown system, the liquid-line solenoid is controlled by the
defrost timer
low pressure switch
low-ambient controller
thermostat
22: All serviceable components of a refrigeration system shall be provided with
safe access
service manuals
name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
manufactures instructions on start-up procedures
23: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
9.00'
8'4"
7.25'
7.00'
24: What are the three components of a transformer?
Primary coil, secondary coil, and core
Primary core, secondary coil, and high and low voltage connectors.
Contacts, secondary coil, and core
Primary coil, secondary coil, and copper contacts
25: What type of voltage cause a potential relay to open?