Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
the aggregate of the high side and low side
the high side
the low side
2.5 times the design pressure
2: Dual-pressure relief devices should be installed on
vessels of 10 cubic feet or less
vessels of 3 cubic feet or less
vessels of 3 cubic feet or more
vessels of 10 cubic feet or more
3: All electrical work done on refrigeration systems must comply with
NEC and Massachusetts Modifications
OSHA
ASHREA-15 Section 9.2.1
Department of Energy
4: R-410A can segregate in the system or chemically change its composition due to a leak.
True
False
5: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
checking the level of refrigerant in the system
testing for oil in the system
testing for moisture in the system
none of the above
6: A professional or office building would be considered what type of occupancy?
mercantile
commercial
business
public assembly
7: What pipe can not be used for refrigeration?
L
M
K
N
8: Pressure vessels with an internal volume of 10 cubic feet or more
shall use rupture discs or duel pressure relief valves
shall use pressure relief devices
shall use fusible plugs
shall use pressure relief devices or fusible plugs
9: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
21F
29F
11F
9F
10: When the compressor is below the condensor
traps are needed on the suction line
traps are not needed on this type of system
traps are needed on the oil return line
traps are needed on the discharge line
11: What section governs pressure vessels?
OSHA
Section 1 ASHREA 15 ASME fired
Section ASHREA 34
Section 8 ASHREA 15 ASME unfired
12: What refrigerant has zero ozone depletion
HFC
CFC
HCFC
None of the above
13: Excessive head pressure is often caused by
leaking reed valve on the discharge side
insufficient refrigerant
thermostat set too high
air cooled condenser is plugged
14: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
fusible plug
relief valve
rupture disc
all of the above
15: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
208v
120v
240v
277v
16: Usually dry bulb temperature is
higher than wet bulb temperature
not important and shall be ignored
same as wet bulb temperature
lower than dry bulb temperature
17: A Low-Probability System
is such that any leak will cause injury or death to anyone within a 100 square foot area
is such that a leak of refrigerant from a failed connection will enter the occupied space
is such that a leak of refrigerant from a failed connection can not enter the occupied space
is a system highly likely to leak form a failed connection or component of such system
18: 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
19: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
ammonia
trichlorotrifluoromethane
R-718
methyl chloride
20: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
6.830
3.415
16.64
34.15
21: An electronic bridge circuit is basically a
24 volt control circuit
suspension
high voltage circuit
Wheatstone
22: Gauge pressure is
Force of pressure above that of atmosphere
Atmospheric pressure
Barometric pressure
Absolute pressrue
23: What do you need to do when you install a new system?
Have it inspected
Document the superheat and subcooling reading
Insulate the suction line before you take a superheat reading