Topics: All categories in the pool
1: The best way to determine the voltage requirement for an electrical component is to
- read the voltage with a mulitmeter
- determine the capacity of the service panel
- check with the utility company
- read the nameplate data
2: Three-phase motors have what type of windings?
- three start windings
- one start winding and one run winding.
- three run windings
- three run windings and 3 start windings
3: B3 refrigerants are considered
- toxic and highly flammable
- non-toxic but non-flammable
- toxic but non-flammable
- non-toxic but flammable
4: What is the definition of exit?
- Anywhere where a stairwell leads to outdoors
- The separated fire-resistant portion of a means of egress providing a protected travel path between the exit access and the exit discharge
- Any doorway or pathway unobstructed for access to anywhere considered safe
- Both a & b
5: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will cool excessively as the solution evaporates
- The machine will cool excessively as the solution crystallizes.
- The machine will stop cooling and the solution will evaporate.
- The machine will stop cooling and solution will crystallize
6: Evaporators within 18" of a heating coil must be equipped with a
- low limit control
- pressure relief device
- high limit control
- zone valve
7: What would be the classification for Stop & Shop grocery store?
- Large mercantile
- Place of assembly
- Instituional
- Industrial
8: In a horizontal shell & tube condenser, the ammonia is liquefied by
- water sprayed over condenser
- removing the latent heat of fusion
- removing the latent heat of vaporization
- passing thru the tubes from top to bottom
9: What is the purpose of a trap in a vertical discharge line with an upward flow?
- start the flow of oil throughout the system
- ensure proper oil return to the compressor
- Installing a vertical discharge line with an upward flow is prohibited by code
- None of the above
10: What is the boiling point of refrigerant governed by?
- Compressor RPM's
- P&T relationship
- Evaporator temperature
- Condenser sub-cooling
11: It takes how many BTU/hr to melt one pound of ice at 32F
- 144
- 212
- 180
- 970
12: Brazed joints melt at temperatures above
- 500F
- 1,200F
- 800F
- 1,000F
13: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and the stop valve
- between the compressor and reciever
- between the compressor and oil separator
14: Viscosity is
- the coefficient of external friction
- measure of weight
- a measure of heat content
- the ability of oil to flow
15: A class B1 refrigerant is considered
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic but non-flammable
- toxic and somewhat flammable
16: Pi equals approximately
- 3.41
- 12,000
- 746
- 3.14
17: If the power element of an expansion valve should lose its charge the valve would
- overfeed the evaporator
- underfeed the evaporator
- go open
- go closed
18: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
- 1%
- 4%
- 25%
- 2%
19: What is potential measured in?
- Volts
- Ohms
- Amps
- Henrys
20: A start capacitor is wired in _____ with the start windings.
- series-parallel
- series
- parallel
- junction
21: Control systems can be classified by
- source of power
- economy of operation
- safety
- tonnage of system
22: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- high pressure
- critical pressure
- design pressure
23: The two basic types of evaporators are
- prime surface and finned
- finned and plate
- direct expansion and plate
- flooded and direct expansion
24: 746 watts is equal to
- Pi
- 10 hp
- 1 hp
- 100 hp
25: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Saturated temperature
- Critical temperature
- Wet bulb temperature
- Dry bulb temperature