Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: All electrical work done on refrigeration systems must comply with
ASHREA-15 Section 9.2.1
NEC and Massachusetts Modifications
OSHA
Department of Energy
2: What must be done if refrigeration lines pass through a concrete floor?
insulated
installed through a pipe casing
leak checked
moisture barrier
3: One ton of refrigeration is defined as ______ btu/minute.
200
12,000
60
720,000
4: 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 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 can not enter the occupied space
5: 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
6: What type of copper is not permitted on refrigeration systems?
Type L
Type N
Type M
Type K
7: How many BTU's is produced by one watt of energy
3.41
3.00
1
2.57
8: Which refrigerant is lighter than air?
R-123
R-11
R-134a
R-717
9: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
True
False
10: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
365 psig, 120 psig
257 psig, 77 psig
226 psig, 68 psig
455 psig, 185 psig.
11: A moisture indicator must
be filled with liquid
be sight side up
be yellow
change color when exposed to moisture
12: How are refrigerant blends classified?
Based on the oil used
Based on best case Fractionation
Blends don't have to be classified
Based on worst case fractionation
13: On a TXV, the purpose of an external equalizer is to?
Increase the pressure on the top of the power head diaphragm
allow a greater adjustment spam
compensate for a pressure drop across the evaporator coil
balance the evaporator load
14: _____ and its alloys are suitable for use with ammonia systems.
Copper
Aluminum
Zinc
Magnesium
15: One atmosphere equals
14.7
0 psia
0 psig
29.4
16: How many volts would you read on a 480V system phase to phase?
0
480
1/3 the voltage
277
17: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
far apart or greater difference
a ling psychrometer doesn't have two theremometers.
2F difference
nearly the same
18: Joints in refrigeration piping must be _____ before being covered?
Leak tested
Pressurized
Insulated
Inspected
19: The gauge thickness required on a CO2 tank construction is
5/16"
3/32"
1/16"
1/8"
20: How many gallons of water do you need per pound of ammonia?
10
50
100
1
21: What will occur if the strong solution in an absorption chiller becomes too strong?
The machine will cool excessively as the solution crystallizes.
The machine will stop cooling and the solution will evaporate.
The machine will stop cooling and solution will crystallize
The machine will cool excessively as the solution evaporates
22: A High-Probability System
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 will enter the occupied space
is such that a leak of refrigerant from a failed connection will enter an unoccupied space
is such that any leak will cause injury or death to anyone within a 100 square foot area
23: On a single phase motor, when does the start winding cut out?
75% of its RLA speed
50% of its RLA speed
25% of its RLA speed
100% of its RLA speed
24: The amount of heat required to raise the temperature of 1 lb of water 1F is?
The rate of conduction
1 Therm
1 Kelvin
1 BTU
25: Which is considered the more efficient condenser?