Topics: All categories in the pool
1: How much clearance do you need around the perimeter of electrical panels?
- 36"
- 12"
- 18"
- 24"
2: The best way to determine the voltage requirement for an electrical component is to
- determine the capacity of the service panel
- check with the utility company
- read the nameplate data
- read the voltage with a mulitmeter
3: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
- the gas is no longer saturated
- the gas returns to a liquid
4: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- EPR valve
- CPR valve
- EEV
- Solenoid valve
5: What are the three components of a transformer?
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and copper contacts
6: How many refrigerant classifications are there for flammability?
- 2
- 1
- 3
- 7
7: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
8: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is
- 1.7
- .8
- .1
- 1.2
9: The External equalizer of a TXV compensates for
- pressure drop across the condenser coil
- pressure drop across the evaporator coil
- pressure within the evaporator
- pressure within the system
10: A class B2 refrigerant is considered
- non-toxic and non-flammable
- toxic and non-flammable
- toxic and somewhat flammable
- non-toxic and highly flammable
11: What is the typical air conditioning operating pressures for R-22?
- 60 psi suction 210 psi discharge
- 25 psi suction 125 psi discharge
- 105 psi suction 340 psi discharge
- None of the above
12: How is bring measured?
- hydrometer
- hygrometer
- manometer
- anemometer
13: Dew point is
- the temperature above which water vapor in the air will start to condense
- the temperature below which water vapor in the air will start to evaporate
- the temperature below which water vapor in the air will start to condense
- the temperature of air of 50% RH
14: Ammonia systems use ____ pressure to adjust oil pressure
- liquid
- stream
- discharge
- air
15: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?
- Pressure induced displacement.
- Positive displacement
- Non-positive displacement
- Low Pressure displacement
16: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
17: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- public assembly occupancy
- institutional occupancy
- commercial occupancy
- mixed occupancy
18: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the low side
- upper chamber of the high side
- lower chamber of the high side
- lower chamber of the low side
19: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- not enough oil in the system
- moisture in the system
- low head pressure
- oil in evaporator
20: How many gallons of water do you need per pound of ammonia?
- 10
- 1
- 50
- 100
21: What is the minimum height refrigeration piping should be placed against walls?
- 72"
- 7.25'
- 6'
- Ceiling height
22: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
- Air
- Heat
- Oil
- Electricity
23: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with R-718
- Flush with ammonia
- Flush with RX-11
- Flush with R-11
24: An air conditioning system rated for 36,000 BTU's is equivalent to
- one ton of cooling
- 12,000 tons of cooling
- two tons of cooling
- three tons of cooling
25: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and unbalanced head and friction head
- GPM and friction head