Topics: All categories in the pool
1: Megaohm meters can detect a ground in the
- up to 1,000,000 ohms
- up to 10,000 ohms
- up to 1,000 ohms
- 10,000,000 ohms or higher
2: A VRF system is a direct system
- true
- false
3: What is the purpose of a surge capacitor on a contactor?
- to protect low voltage equipment
- to keep the contactor pulled in
- to balance the sine waves
- to provide smoother start/stops
4: Name a reason that does not cause reduced condenser air quantity
- Prevailing winds
- Dirty fan blades
- High ambient temperature
- Dirty Coil
5: An oil pressure safety switch should be set at
- 10 to 15 psi below low side pressure
- 5 to 10 psi above low side pressure
- 10-15 psi above low side pressure
- 5 to 10 psi below low side pressure
6: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and oil separator
- between the compressor and the stop valve
- between the compressor and reciever
7: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- lower
- there is no Group B1 refrigerants
- the same
- higher
8: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 2.2
- 1.2
- 1
- 1.5
9: Watt's Law indicates Volts X Amps = _________.
- Resistance
- Ohms
- Current
- Watts
10: Direct systems using Group II refrigerants
- shall be allowed to be used for human comfort.
- 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
11: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 50
- 75
- 24
- 100
12: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 75
- 20
- 15
- 50
13: What would be the classification for Stop & Shop grocery store?
- Industrial
- Large mercantile
- Instituional
- Place of assembly
14: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 7.25'
- 7.00'
- 8'4"
- 9.00'
15: Fractionation occurs when
- when a fraction of refrigerant is added as the full charge
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- the pressures increase as the heat load increases
- the pressures decreases as the heat load decreases
16: E = I X R is
- Ohms Law
- Amps Law
- Impedance Law
- Watts Law
17: Clearance volume
- varies depending on compressor speed
- is the same on all compressors
- affects compressor capacity
- has no effect on compressor capacity
18: A rule of thumb in air conditioning is ____ CFM per ton?
- 500
- 400
- 100
- 600
19: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
20: Liquid line filter-driers on a 410A system must be rated for no less than
- 600 psig
- 1000 psig
- 200 psig
- 400 psig
21: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
- shall be posted and protected from dirt, water, and other elements
22: Which refrigerant is lighter than air?
- R-11
- R-134a
- R-717
- R-123
23: Three-phase motors have what type of windings?
- one start winding and one run winding.
- three start windings
- three run windings
- three run windings and 3 start windings
24: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
25: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above