Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: The 522 CMR 9.00 has adopted for reference ASHRAE ____
25
III
10
15
2: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called
non-positive displacement compressor
negative displacement compressor
non-volumetric displacement compressor
neutral chamber-type compressor
3: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
455 psig, 185 psig
257 psig, 77 psig
226 psig, 68 psig
350 psig, 120 psig
4: When air is ducted through a machine room that services occupied space, What must be done?
Insulated and cross broke
Flanged and gasketed
Ducted and sealed
Welded and seamed.
5: A declaration test is needed when the system contains more than
65 lbs
55 lbs
110 lbs
120 lbs
6: How many gallons of water do you need per pound of ammonia?
100
1
50
10
7: Low-side system leaks in a low-pressure chiller will often result in
water being pulled into the system
system refrigerant leaking from the system
nitrogen leaking out of the system.
air being pulled into the system
8: What type of relief valve is used on low pressure centrifugal compressor systems?
Spring-loaded relief valve
Rupture disc
Purge relief
None of the above
9: 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.
8'4"
7.25'
7.00'
9.00'
10: A 24 volt transformer with a 240 volt primary can handle how many amps?
There isn't enough information to answer.
20 amps
10 amps
24 amps
11: How many gallons of water per pound of ammonia do you need?
20
1
5
15
12: A solder joint melts at temperatures of
600F to 900F
less than 400F
400F to 800F
1,200F to 1,500F
13: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
splurge
surge
merge
purge
14: What is NOT a positive displacement compressor.
Rotary
Reciprocating
Centrifugal
Scroll
15: Which of the following most closely represents the concentration of Li-Br in a absorption system?
60% Li-Br, 40% distilled water
40% Li-Br, 60% distilled water
50% Li-Br, 50% tap water
40% Li-Br, 60% tap water
16: The purpose of a receiver is
a vessel to store refrigerant outside the system
to increase the capacity that the system can hold
to use a a later date
all of the above
17: When an inspection is needed, how often must it be done?
annually
every 36 months
every 18 months
every 24 months
18: Pipe identification labels are required when the system contains more than
65 lbs
110 lbs
55 lbs
120 lbs
19: Relief valves are rated in
pounds of air per minute
gallons of water per hour
pounds of air per hour
gallons of water per minute
20: What is used to check very low pressure?
Velometer
Hygrometer
Hydrometer
Manometer
21: "P" represents ______ in the Watt's law formula
amperage
reactance
voltage
watts
22: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
UL and UR
UM or UL
UL and UM
UV or UR
23: Heat is a form of
power
matter
work
energy
24: In a motor, an internal overload might open if
there's an excess current draw through the motor
there was a high pressure refrigerant was used for a low pressure system.
there's an open start winding
there's a direct short
25: What refrigerant doesn't have to be classified?