Topics: All categories in the pool
1: An accumulator can be located between the
- first stage and second stage compressors
- compressor and condenser
- evaporator and compressor
- condenser and evaporator
2: A water regulating valve opens when
- the compressor is on
- when the power is on there is an overcharge of refrigerant
- the head pressure rises
- when the power is on
3: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- there is no Group B1 refrigerants
- higher
- lower
- the same
4: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- store excess refrigerant from the reciver
- filter out impurities from the system
- reduce friction loss to the flow of refrigerant
5: On a pumpdown system, the liquid-line solenoid is controlled by the
- thermostat
- low pressure switch
- defrost timer
- low-ambient controller
6: Doors communicating with outside from a mechanical room must be?
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
- Self-closing, aligned, fire door
- Self-closing, wooden, fire door
7: R-22 falls under which safety classification?
- A-1
- B-1
- A-2
- B-2
8: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
9: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
- over pressure protection and a rupture disc
- over pressure protection as well as a temperature protection device
10: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Cascade
- Low pressure
- Simple
- R-414B
11: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 18
- 33
- 50
12: The instrument used to measure the specific gravity of absorption chiller solutions is the
- refractometer
- anemometer
- hydrometer
- Psychrometer
13: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- purge
- surge
- splurge
- merge
14: 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.
- 75
- 50
- 100
- 24
15: The leaving chilled water set point for comfort cooling is typically?
- 45
- 60
- 38
- 66
16: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
17: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
18: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
19: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 208v
- 120v
- 240v
- 277v
20: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
21: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
22: What section governs pressure vessels?
- Section 8 ASHREA 15 ASME unfired
- Section 1 ASHREA 15 ASME fired
- Section ASHREA 34
- OSHA
23: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 90
- 100
- 80
- 110
24: Machinery rooms must be vented to ______?
- neutralizing tank
- basement
- outdoors
- unoccupied spaces
25: Sensible heat is the heat added to a substance to
- cause evaporation
- change its state
- raise its temperature
- freeze it