Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
When there is a space 6' or more above it
When there are sprinklers above
When its white
When it's used as part of a supply or return air system
2: If the suction pressure is low and the evaporator temperature high, the cause will be a?
too small evaporator
overcharged
starved evaporator
compressor suction valve stuck open
3: Ohm's Law indicates Amps X Resistance = ___________.
Current
Ohms
Impedance
Volts
4: 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
5: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
concentrated solution
absorbed solution
weak solution
strong solution
6: A restaurant is classified as a
large mercantile occupancy
mixed occupancy
public assembly occupancy
commercial occupancy
7: What would be the classification of a church?
Institutional
Industrial
Large mercantile
Place of assembly
8: Setting a pressure relief device shall not exceed ___ of the design pressure
90%
75%
80%
100%
9: What is the minimum size wire you can use on a 30 amp circuit?
12 AWG
16 AWG
10 AWG
14 AWG
10: A Low-Probability System
is such that a leak of refrigerant from a failed connection will enter the occupied space
is a system highly likely to leak form a failed connection or component of such system
is such that a leak of refrigerant from a failed connection can not enter the occupied space
is such that any leak will cause injury or death to anyone within a 100 square foot area
11: An accumulator can be located between the
condenser and evaporator
first stage and second stage compressors
evaporator and compressor
compressor and condenser
12: Dew point is
the temperature below which water vapor in the air will start to evaporate
the temperature of air of 50% RH
the temperature below which water vapor in the air will start to condense
the temperature above which water vapor in the air will start to condense
13: _____ and its alloys are suitable for use with ammonia systems.
Copper
Aluminum
Zinc
Magnesium
14: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
27 ohms
80 ohms
104 ohms
71 ohms
15: When must refrigeration system covered by the code be inspected?
Not required
Annually
Upon installation
Annually and when installed
16: one BTU equals
31.4 hp
12,000 hp
Pi
3.41 hp
17: 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
18: R-123 belongs to Group
A-3
B-3
B-2
B-1
19: A mercury bulb controller is not recommended for
use where vibration is severe
low voltage use
line or low voltage use
line voltage use
20: What is Trichlorotrifluoromethane?
R-11
R-13
R-113
R-12
21: Whoever owns/uses a refrigeration or air conditioning system covered by this code
must notify the Department of Public Safety prior to starting the system
shall be licensed by the Commonwealth of Massachusetts according to CMR 522
shall make application for inspections to the Chief of Inspectors
None of the above
22: Which refrigerant class listed below is the most flammable?
A-1
B-2
A-3
C-3
23: Methyl Chloride is a halogenated refrigerant and should not come in contact with
aluminum
zinc
magnesium
all of the above
24: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
Heat
Air
Oil
Electricity
25: On a pumpdown system, the liquid-line solenoid is controlled by the