Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
3/8"
3/4"
1/2"
5/8"
2: What are the three components of a transformer?
Primary core, secondary coil, and high and low voltage connectors.
Contacts, secondary coil, and core
Primary coil, secondary coil, and core
Primary coil, secondary coil, and copper contacts
3: On a pumpdown system, the liquid-line solenoid is controlled by the
defrost timer
thermostat
low pressure switch
low-ambient controller
4: How far from the ground does a relief valve need to be?
Not more than 3' above grade
At least 25' above grade
At least 15' above grade
At least 20' above grade
5: A thermometer inside a duct measures ____ heat.
hidden
latent
sensible
specific
6: Halo-carbon refrigerants cannot be used with what material?
Aluminum
Copper
Stainless Steel
Magnesium alloy
7: What type of material can't be used on the outlet of a relief valve?
Copper
Magnesium alloy
PVC
Stainless steel
8: What is the purpose of a surge capacitor on a contactor?
to balance the sine waves
to keep the contactor pulled in
to provide smoother start/stops
to protect low voltage equipment
9: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
5.5
2.5
3.0
2.0
10: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?
CFM and RPM decrease
CFM and HP decrease
CFM and HP increase
RPM and CFM increase
11: Ammonia belongs to Group
A-2
B-2
B-1
A-1
12: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
120v
277v
208v
240v
13: Halogen refrigerants are corrosive to which type of metal?
copper
stainless steel
black iron
magnesium
14: A professional or office building would be considered what type of occupancy?
business
commercial
mercantile
public assembly
15: What is R-22?
Chlorodifluoromethane
CCFCM
Chlorofluoromethane
HFC
16: A capacitor in series with the start windings will do what?
Increase run efficiency by 10% of its rating
Increase starting torque
Nothing
Decrease the RLA to within 10% of its rating
17: When using nitrogen for brazing, the pressure should be:
Very low
Slightly below atmospheric
50-100 psig
125 psig
18: Evaporators within 18" of a heating coil must be equipped with a
low limit control
pressure relief device
zone valve
high limit control
19: Heat is a form of
power
work
matter
energy
20: A class B1 refrigerant is considered
non-toxic but highly flammable
toxic and somewhat flammable
non-toxic and non-flammable
toxic but non-flammable
21: 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.
“UV”
“UL”
“UM” and “UV”
“U” or “UM”
22: _____ alloys shall not be used in contact with an halogenated refrigerants.
Magnesium
Nickel
Zinc
Copper
23: The rupture disc on a low-pressure chiller typically releases pressure at
0 psig
10 psig
15 psig
5 psig
24: What happens after your initial inspection of a pressure vessel?
Notify the AHJ to let them know that the system been inspected
Notify the Fire Marshal that the system has been inspected and approved
There is a temporary shut-down until a final inspection can be performed.
Inspector leaves a metal tag with a certification listed on it