Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Absolute pressure is
Gauge Pressure
Atmospheric Pressure
Gauge + Atmospheric Pressure + Pi
none of the above
2: R-22 is considered a(n)
HCFC
HCFCH
HFC
CFC
3: A rule of thumb in air conditioning is ____ CFM per ton?
600
500
400
100
4: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called
non-volumetric displacement compressor
non-positive displacement compressor
negative displacement compressor
neutral chamber-type compressor
5: Which of the following is not an air velocity meter?
Velometer
Hydrometer
Anemometer
Anemotherm
6: If the suction pressure is low and the evaporator temperature high, the cause will be a?
starved evaporator
compressor suction valve stuck open
too small evaporator
overcharged
7: What refrigerant doesn't have to be classifted?
R-711
R-717
R-134a
R-718
8: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
66.1 psig
70.8 psig
43.3 psig
50.2 psig
9: How many BTU's is produced by one watt of energy
1
2.57
3.41
3.00
10: A normal operating evaporator temperature of R-22 for air conditioning is typically
45F
55F
32F
58F
11: 746 watts is equal to
1 hp
Pi
100 hp
10 hp
12: 1 Watt = ______ BTU's?
12
7.216
4.482
3.412
13: The leaving chilled water set point for comfort cooling is typically?
66
45
60
38
14: Stop valves shall not be permitted between the system and the
relief valve
service valve
condenser
bleed valve
15: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
Sensible heat
Specific heat
Enthalpy
Latent heat
16: Control systems can be classified by
tonnage of system
safety
economy of operation
source of power
17: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
liquid line that is too small
shortage of refrigerant
liquid line that had too high vertical lift
All of the above
18: 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
19: Ohm's Law indicates Amps X Resistance = ___________.
Ohms
Impedance
Volts
Current
20: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
illegal occupancy
commercial occupancy
institutional occupancy
public assembly occupancy
21: A pressure relief should be located at least _______ from windows and doors.
30'
20'
25'
15'
22: A hotel is considered a _______ occupancy.
institutional
residential
mercantile
commercial
23: What is specific heat?
measured heat
heat required to raise the temperature of 1lb of a substance 1 degree
the specific heat required to change the state of one cubic foot of air to steam
none of the above
24: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.