Topics: All categories in the pool
1: Volts x amps equals
- Watts
- Impedance
- Inductance
- Ohms Law
2: A restaurant is classified as a
- commercial occupancy
- large mercantile occupancy
- public assembly occupancy
- mixed occupancy
3: The reversing valve is commonly used
- on commercial system that involve two different temperatures
- on multiple compressor systems
- when the code requires a check valve
- on all heat pumps
4: A cross charged power element on an expansion valve would normally be used in what temperature range?
- -100F to -40F
- 30F to 50F
- -40F to 0F
- 0F-38F
5: A relief valve discharge capacity is rated in
- PSIG
- PSIA
- Pounds of air per minute.
- temperature minus pounds of air per second divided by release rate squared
6: Which winding have the most turns?
- Start
- depends on the motor phase
- run
- they have equal amount of turns
7: How many refrigerant classifications are there for flammability?
- 2
- 3
- 1
- 7
8: Joints in refrigeration piping must be _____ before being covered?
- Pressurized
- Leak tested
- Insulated
- Inspected
9: Electricity involves the movement of electrons in atoms
- True
- False
10: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
- 506v
- 550v
- 660v
- None of the above
11: Ammonia systems use ____ pressure to adjust oil pressure
- air
- discharge
- liquid
- stream
12: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 3.0, 3.5
- 6.6, 6.6
- 2.5, 2.5
- 2.5, 3.0
13: Thermodynamics is the branch of science that deals with
- state of energy
- heat energy
- molecular therory
- energy due to motion
14: 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
15: R-410A is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-1
- B-1
- A-2
16: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
17: The two float-type metering devices are the
- vapor float and the low-side float.
- liquid float and the low-side float
- high-side float and the low-side float
- liquid float and the vapor float
18: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
19: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- of Group B2 refrigerant shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
20: A movie theater would be considered a
- mixed occupancy
- commercial occupancy
- institutional occupancy
- public assembly occupancy
21: What kind of material can't be used on the outlet of a relief valve?
- Copper
- Stainless Steel
- Aluminum
- PVC
22: E = I X R is
- Amps Law
- Watts Law
- Impedance Law
- Ohms Law
23: Doors communicating with outside from a mechanical room must be?
- Self-closing, aligned, fire door
- Self-closing, approved, fire door
- Self-closing, wooden, fire door
- Steel, approved, weather-stripped
24: Viscosity is
- measure of weight
- the ability of oil to flow
- a measure of heat content
- the coefficient of external friction
25: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- oil in evaporator
- moisture in the system
- low head pressure
- not enough oil in the system