Topics: All categories in the pool
1: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- run as designed with low ambient controls
- doesn't change
- decreases
- increases
2: Pipe identification labels are required when the system contains more than
- 65 lbs
- 110 lbs
- 120 lbs
- 55 lbs
3: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
4: R-717 is
- trichloromethane
- carbon dioxide
- ammonia
- water
5: The first step in mechanical refrigeration is
- condensation
- evaporation
- expansion
- compression
6: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 10
- 15
- III
- 25
7: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 88
- 96
- 38
- 58
8: B3 refrigerants are considered
- non-toxic but flammable
- toxic and highly flammable
- toxic but non-flammable
- non-toxic but non-flammable
9: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Simple
- R-414B
- Low pressure
- Cascade
10: What would be the classification of a church?
- Place of assembly
- Industrial
- Large mercantile
- Institutional
11: Liquid line filter-driers on a 410A system must be rated for no less than
- 1000 psig
- 200 psig
- 600 psig
- 400 psig
12: The measurement of heat in a particular substance is
- latent heat
- enthalpy
- sensible heat
- specific heat
13: Who is permitted to access a refrigeration machine room?
- Authorized persons only
- Contractors only
- Any employee
- Anyone, it's a completely safe area
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.
- 50
- 75
- 24
- 100
15: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the evaporator
- on a conspicuous card located near the compressor
- outside the room, immediately adjacent to each door
- inside the room, immediately adjacent to each door
16: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
17: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
18: Class A refrigerants are considered
- non-toxic
- non-flammable
- toxic
- flammable
19: Doors communicating with outside from a mechanical room must be?
- Self-closing, wooden, fire door
- Self-closing, aligned, fire door
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
20: Gauge pressure is
- Force of pressure above that of atmosphere
- Barometric pressure
- Absolute pressrue
- Atmospheric pressure
21: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called
- non-volumetric displacement compressor
- negative displacement compressor
- non-positive displacement compressor
- neutral chamber-type compressor
22: 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
23: How is bring measured?
- hydrometer
- hygrometer
- anemometer
- manometer
24: "P" represents ______ in the Watt's law formula
- watts
- amperage
- voltage
- reactance
25: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- lift voltage
- boost voltage
- pick-up voltage
- run voltage