Topics: All categories in the pool
1: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 12,000 BTU
- 144 BTU
- 970 BTU
- 24,000 BTU
2: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
- liquid line that is too small
- shortage of refrigerant
- liquid line that had too high vertical lift
- All of the above
3: A High-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
4: The outer portion of shell of the compressor used on low-pressure chillers is called the
- volute
- nozzle
- suction
- baffle
5: On a single phase motor, when does the start winding cut out?
- 50% of its RLA speed
- 75% of its RLA speed
- 100% of its RLA speed
- 25% of its RLA speed
6: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
7: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will stop cooling and solution will crystallize
- The machine will stop cooling and the solution will evaporate.
- The machine will cool excessively as the solution crystallizes.
- The machine will cool excessively as the solution evaporates
8: How many BTU's is produced by one watt of energy
- 3.41
- 2.57
- 1
- 3.00
9: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- The rate of conduction
- 1 Therm
- 1 Kelvin
- 1 BTU
10: What type refrigerant is NOT ozone depleting?
- CFC
- HFC
- Halon
- HCFC
11: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
12: A positive displacement compressor is
- is a reciprocating type compressor with 2 or more pistons
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
13: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
14: Humidity can be sensed with
- pressure bellows
- human hair
- bimetal
- thermometer
15: The best way to detect ammonia in brine is
- nessler regaent
- CO2 gas
- carbonation of soda
- potassium of line
16: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- public assembly occupancy.
- business occupancy
- commercial occupancy
- mercantile occupancy
17: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
18: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
19: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
20: On a pumpdown system, the liquid-line solenoid is controlled by the
- defrost timer
- low pressure switch
- thermostat
- low-ambient controller
21: What is the purpose of a surge capacitor on a contactor?
- to keep the contactor pulled in
- to provide smoother start/stops
- to protect low voltage equipment
- to balance the sine waves
22: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 25
- 15
- 10
- 20
23: When must refrigeration system covered by the code be inspected?
- Upon installation
- Annually and when installed
- Not required
- Annually
24: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 6.6
- 330
- 110
25: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- A group sensing
- phosgene gas sening
- refrigerant sensing
- CO Sensing