Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: A pressure relief should be located at least _______ from windows and doors.
25'
20'
30'
15'
2: A start capacitor in series with a start winding will
increase the amp draw of the motor
increase starting torque
increase running efficiency
decrease the amp draw of the motor
3: A thermometer inside a duct measures ____ heat.
latent
hidden
sensible
specific
4: R-410A is classified as a ____ refrigerant on the safety matrix.
A-2
B-1
B-2
A-1
5: The principle used in continuous type absorption systems is
Dalton's Law
Ohm's Law
Boyle's Law
Charles's Law
6: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
boost voltage
pick-up voltage
lift voltage
run voltage
7: How are a compressor and condenser fan wired?
parallel-series
parallel
series-parallel
series
8: A relief valve discharge capacity is rated in
temperature minus pounds of air per second divided by release rate squared
PSIA
PSIG
Pounds of air per minute.
9: What device should be used on low-temperature freezers?
discharge muffler
oil separator
hot-gas by-pass
high capacity TXV
10: What kind of system uses two different refrigerants in separate systems dependent on each other?
R-414B
Cascade
Low pressure
Simple
11: An example of an "Expendable Refrigerant" is
ammonia
liquid nitrogen
lithium bromide
liquid oxygen
12: How much refrigerant can be stored in a mechanical room outside of the system?
150
100
330
200
13: How many refrigerant classifications are there for flammability?
3
7
1
2
14: Viscosity is
the ability of oil to flow
the coefficient of external friction
a measure of heat content
measure of weight
15: The best way to determine the voltage requirement for an electrical component is to
read the nameplate data
determine the capacity of the service panel
read the voltage with a mulitmeter
check with the utility company
16: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
“UL”
“UV”
“U” or “UM”
“UM” and “UV”
17: The heat picked up in the evaporator must equal to
the heat of compression
the heat gained by the condenser
the heat lost by the medium being cooled
the heat giving by the condenser
18: A solder joint melts at temperatures of
400F to 800F
1,200F to 1,500F
less than 400F
600F to 900F
19: Absolute pressure is
Gauge Pressure
Atmospheric Pressure
Gauge + Atmospheric Pressure + Pi
none of the above
20: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
Buss-eye, weight, pressure, and frost line
sight glass, weight, pressure, and frost line
sight glass, weight, paper method, and frost line.
sight glass, weight, pressure, and dipstick
21: A hotel is considered a _______ occupancy.
mercantile
residential
commercial
institutional
22: Fractionation occurs when
the pressures increase as the heat load increases
the pressures decreases as the heat load decreases
some of the blended refrigerant evaporates or condenses before the rest of the blend
when a fraction of refrigerant is added as the full charge
23: How can you test mechanical strength of an electrical connection?
measure ohms with an electrical meter
measure voltage across the connection
attempt to pull the wire from the connector by hand
none of the above.
24: When must refrigeration system covered by the code be inspected?
Annually
Not required
Upon installation
Annually and when installed
25: A split-phase motor has a ______ winding and a ____ winding