Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: How many refrigerant classifications are there for toxicity?
1
5
2
3
2: What is the maximum voltage range allowed on an electrical circuit?
5%
10%
20%
15%
3: Excessive head pressure is often caused by
leaking reed valve on the discharge side
thermostat set too high
air cooled condenser is plugged
insufficient refrigerant
4: In a motor, an internal overload might open if
there's an open start winding
there was a high pressure refrigerant was used for a low pressure system.
there's an excess current draw through the motor
there's a direct short
5: What type refrigerant is NOT ozone depleting?
CFC
HFC
HCFC
Halon
6: Which of the following most closely represents the concentration of Li-Br in a absorption system?
40% Li-Br, 60% distilled water
40% Li-Br, 60% tap water
60% Li-Br, 40% distilled water
50% Li-Br, 50% tap water
7: Ammonia (NH3) is a group III refrigerant
True
False
8: Heat is a form of
matter
work
energy
power
9: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
Stop valve
Muffler
Moisture indicator
Foot valve
10: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
3
5
1
2
11: 1 Watt = ______ BTU's?
7.216
12
4.482
3.412
12: Setting a pressure relief device shall not exceed ___ of the design pressure
75%
80%
90%
100%
13: A run capacitor is wired in series with the _____ windings.
common
start capacitor
run
start
14: Booster compressors connect to the ____ side of the compressor
low side
liquid
vapor
oil side
15: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
100
50
24
75
16: The density of a gas refers to
pounds per absolute pressure
cubic feet per pound
pounds per square foot
pounds per cubic foot
17: An example of an "Expendable Refrigerant" is
liquid oxygen
liquid nitrogen
lithium bromide
ammonia
18: What section of ASHRAE-15 governs pressure vessels?
Section 6 ASHRAE-34 ASME VIII unfired
Section 9 ASHRAE-15 ASME VIII unfired
Section 7 ASHRAE-15 ASME VIII fired
OSHA
19: A motor starter contains a thermal overload and a
transformer
3-way relay
contactor
solenoid
20: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
6.6 lbs
44 lbs
13.9 lbs
22 lbs
21: The heat picked up in the evaporator must equal to
the heat giving by the condenser
the heat lost by the medium being cooled
the heat gained by the condenser
the heat of compression
22: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
Machinery rooms need not be vented
the return air ducted system
the outdoors
the mechanical room housing the refrigeration system
23: Capacity control on a centrifugal compressor is accomplished by the
slide vanes
check valves
post-rotational guide vanes
pre-rotational guide vanes
24: How many opening forces operate a thermostatic expansion valve?
3
2
1
4
25: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?