Topics: All categories in the pool
1: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Therm
- The rate of conduction
- 1 Kelvin
- 1 BTU
2: What is Trichlorotrifluoromethane?
- R-113
- R-13
- R-11
- R-12
3: A rule of thumb in air conditioning is ____ CFM per ton?
- 100
- 600
- 400
- 500
4: The low pressure oil safety switch
- resets itself after the time delay has terminated
- must be reset manually
- never trips
- resets itself automatically
5: Start to Run windings will have what resistance?
- All will be at equal values
- Somewhere between the actual start winding and run winding resistance value
- The most resistance value
- The least resistance value
6: "E" references ____ in the Ohm's law formula
- amperage
- capacitance
- voltage
- resistance
7: A Lithium-bromide system is an absorption system that
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
8: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Specific heat
- Enthalpy
- Sensible heat
- Latent heat
9: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- the same
- lower
- there is no Group B1 refrigerants
- higher
10: Three-phase motors have what type of windings?
- one start winding and one run winding.
- three run windings and 3 start windings
- three start windings
- three run windings
11: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 700F
- 1000F
- 600F
- 800F
12: The evaporator is a device to
- Keep the compressor busy
- absorb heat into the refrigeration system
- remove heat from the refrigeration system
- store liquid refrigerant
13: All low-pressure chillers use which type of compressor?
- Reciprocating
- Rotary
- Centrifugal
- Scroll
14: Booster compressors connect to the ____ side of the compressor
- oil side
- vapor
- low side
- liquid
15: Gauge pressure is
- what a gauge reads when checking pressures on a chilled water system.
- force of pressure above that of atmospheric
- atmospheric pressure
- absolute pressure
16: R-717 is
- ammonia
- trichloromethane
- carbon dioxide
- water
17: When should a relief valve start to function?
- Two times it's working pressure
- At it's set pressure
- 10 psi before it's set pressure
- Before the purge station discharges
18: Capacitors are rated in
- micro-farads
- megaohms
- volt - amperes
- kelvins
19: Suction line oil traps should be installed when the condenser is
- in the basement and the evaporator is on the third floor
- more than 100' away from the evaporator
- located outside the operates in temperatures below 35F
- on the third floor roof and the evaporator is in the basement
20: The rupture disc on a low-pressure chiller typically releases pressure at
- 5 psig
- 0 psig
- 10 psig
- 15 psig
21: The reversing valve is commonly used
- on commercial system that involve two different temperatures
- when the code requires a check valve
- on multiple compressor systems
- on all heat pumps
22: At higher altitudes, boiling temperatures
- depends on the refrigerant
- decrease
- are unaffected
- increase
23: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- self-closing doors
- automatic ventilation
- tight fitting doors
24: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
- shall be allowed to be used for human comfort.
25: Copper and its alloys shall not be used with ammonia
- True
- False