Topics: All categories in the pool
1: Pi equals approximately
- 746
- 3.41
- 12,000
- 3.14
2: Halo-carbon refrigerants cannot be used with what material?
- Copper
- Aluminum
- Magnesium alloy
- Stainless Steel
3: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above
4: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- do not need pressure relief protection
5: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
6: How many gallons of water do you need per pound of ammonia?
- 1
- 50
- 100
- 10
7: The certificate of inspection
- shall be posted on the compressor shell or electrical panel at the unit
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted and protected from dirt, water, and other elements
- shall be authorized by a notarized insurance company
8: In a horizontal shell & tube condenser, the ammonia is liquefied by
- removing the latent heat of fusion
- passing thru the tubes from top to bottom
- removing the latent heat of vaporization
- water sprayed over condenser
9: Who authorizes changes to the safety codes?
- Board of Boilers
- Person in charge of the facility
- Person who pulled the permit
- Contractor who last serviced the system.
10: Which winding have the most turns?
- Start
- they have equal amount of turns
- depends on the motor phase
- run
11: A run capacitor is wired in series with the _____ windings.
- start capacitor
- run
- start
- common
12: How many different groups of refrigerants are there?
- 15
- 3
- 7
- 11
13: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 BTU
- The rate of conduction
- 1 Kelvin
- 1 Therm
14: While water is evaporated in an evaporative condenser the impurities which were in the water are
- remain in the air
- blown to the atmosphere by the fan
- washed out of the air by the spray pump
- accumulate in the sump water
15: 1 Watt = ______ BTU's?
- 3.412
- 7.216
- 12
- 4.482
16: Color is important in oil because
- it makes sight glasses easy to read
- it indicates the viscoisty.
- allows you to see into crankcase
- can tell us something about the refining of oil
17: What are the three components of a transformer?
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
18: What's the most efficient condenser type?
- Shell and tube
- Air cooled fins
- Both are equal in efficiency
- None of the above
19: Adjusting the spring pressure on a TXV
- changes superheat
- changes subcooling
- makes no difference
- adjusts the bulb charge
20: How are a compressor and condenser fan wired?
- series
- parallel
- parallel-series
- series-parallel
21: A class B1 refrigerant is considered
- toxic but non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
22: If two 500 ohm resistors are connected in series, the resistance will be
- 200 ohms
- 500 ohms
- 20 ohms
- 1000 ohms
23: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-123
- R-11
- R-22
24: Which of the following most closely represents the concentration of Li-Br in a absorption system?
- 40% Li-Br, 60% distilled water
- 60% Li-Br, 40% distilled water
- 50% Li-Br, 50% tap water
- 40% Li-Br, 60% tap water
25: Megaohm meters can detect a ground in the
- 10,000,000 ohms or higher
- up to 10,000 ohms
- up to 1,000,000 ohms
- up to 1,000 ohms