Topics: All categories in the pool
1: 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
- moisture indicators
- automatic closing shut-off valves
- All of the above
2: One ton of refrigeration is defined as ______ btu/minute.
- 720,000
- 60
- 12,000
- 200
3: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 746 watts
- 5KW
- 1000 watts
- 600 watts
4: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 6.6 lbs
- 13.9 lbs
- 44 lbs
5: How would you know if there was a loss of crankcase pressure?
- oil will thicken
- oil will foam
- oil will thin out
- oil level will rise
6: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- strong solution
- weak solution
- concentrated solution
- absorbed solution
7: The outer portion of shell of the compressor used on low-pressure chillers is called the
- nozzle
- suction
- baffle
- volute
8: 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 increase
- CFM and HP decrease
- RPM and CFM increase
9: A single pole-double throw switch used how many wires excluding the ground wire?
- five
- two
- four
- three
10: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 10
- 24
- 18
- 15
11: Which is the lowest vacuum?
- 1,000 Microns
- 5 psig
- 5" hg
- 10 psia
12: A EPR valve is installed on what type of evaporators?
- high-temperature evaporators
- low-temperature evaporators
- plate evaporators
- shell and tube evaporators
13: How many flammability classifications are refrigerants in?
- 5
- 2
- 3
- 7
14: What pipe can not be used for refrigeration?
- N
- K
- L
- M
15: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 15
- III
- 10
- 25
16: R-123 belongs to Group
- B-2
- B-1
- B-3
- A-3
17: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- 24 volt secondary side of the Class 2 transformer to the thermostat
- first disconnect in
- breaker panel in
- load-side of the contactor in
18: How many closing forces operate a thermostatic expansion valve?
- 4
- 3
- 2
- 1
19: R-717 is
- ammonia
- carbon dioxide
- water
- trichloromethane
20: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
21: "I" represents ____ in the Ohm's law formula.
- voltage.
- amperage
- capacitance
- resistance
22: The gauge thickness required on a CO2 tank construction is
- 5/16"
- 1/16"
- 1/8"
- 3/32"
23: A start capacitor in series with a start winding will
- decrease the amp draw of the motor
- increase starting torque
- increase running efficiency
- increase the amp draw of the motor
24: What is the refrigerant chlorodifluoromethane?
- R-123
- R-22
- R-12
- R-134a
25: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.