Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: A High-Probablity 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 failed connections will enter the unoccupied space
is a system highly likely to leak from a failed connection or component of such system
is such that a leak of refrigerant from failed connections will enter the occupied space
2: What type of fuses must be used on a HVAC system?
TR Type, Duel Element, Time Delay
Fast blow
10% lower than RLA
none of the above
3: 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
4: What type of pressure relief device is used on a CO2 system?
Glove valve
Gate valve
Fusible plug
Rupture disk
5: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
Water and soap
Moisture and air
Air and dirt
Oil and water
6: The best way to detect ammonia in brine is
CO2 gas
carbonation of soda
potassium of line
nessler regaent
7: The two float-type metering devices are the
high-side float and the low-side float
vapor float and the low-side float.
liquid float and the vapor float
liquid float and the low-side float
8: What is the purpose of a surge capacitor on a contactor?
to keep the contactor pulled in
to protect low voltage equipment
to balance the sine waves
to provide smoother start/stops
9: 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?
88
38
58
96
10: By using nitrogen within a pipe during brazing operation,
Copper oxide formation is prevented
The explosion hazard is confined
Discoloration is prevented
Exterior scale formation is minimized
11: Pi equals approximately
3.41
12,000
746
3.14
12: When is the only time you can leave a service container attached to a system?
Leaking system
Recovery
Charging
Both b and c
13: What is potential measured in?
Volts
Henrys
Amps
Ohms
14: What is the voltage of each leg of a 480 Volt three-phase motor?
240v
277v
120v
208v
15: While the system is operating, the discharge line should be
at the same temperature as the crankcase
room temperature
10-15F warmer than ambient
too hot to hold by hand
16: Methyl Chloride is a halogenated refrigerant and should not come in contact with
aluminum
zinc
magnesium
all of the above
17: Ohm's Law indicates Amps X Resistance = ___________.
Current
Volts
Ohms
Impedance
18: Where is the high-side float located on a chiller system?
discharge line
liquid line
inside the chiller barrel
flash line
19: A EPR valve is installed on what type of evaporators?
high-temperature evaporators
low-temperature evaporators
plate evaporators
shell and tube evaporators
20: A split-phase motor has a ______ winding and a ____ winding
start, common
run, start
duel-run, duel-start
run, common
21: Name a reason that does not cause reduced condenser air quantity
Prevailing winds
Dirty Coil
Dirty fan blades
High ambient temperature
22: What refrigerant is an inorganic compound?
Ammonia
R-132A
R-22
R-410A
23: R-12. R-22, and R-40 are considered Group I refrigerants.
True
False
24: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
color-coded glass to determine type of refrigerant