Topics: All categories in the pool
1: Ammonia belongs to Group
- A-1
- B-1
- B-2
- A-2
2: 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
3: A professional or office building would be considered what type of occupancy?
- mercantile
- business
- commercial
- public assembly
4: Liquid line filter-driers on a 410A system must be rated for no less than
- 600 psig
- 1000 psig
- 200 psig
- 400 psig
5: A positive displacement compressor is
- 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
- is a reciprocating type compressor with 2 or more pistons
6: Liquid level gauges must be provided with what?
- A relief valve
- A red line
- A low level mark
- Automatic shut-offs
7: How much clearance do you need around the perimeter of electrical panels?
- 24"
- 12"
- 18"
- 36"
8: What device measures the specific gravity of a substance?
- Hygrometer
- Manometer
- Thermometer
- Hydrometer
9: A device used to measure small pressure differences is the
- manometer
- phsycometirc
- anemometer
- pyrometer
10: What type of relief valve is used on a CO2 system?
- gate valve
- fusible plug
- glove disc
- rupture disc
11: How many BTU's is produced by one watt of energy
- 3.41
- 2.57
- 1
- 3.00
12: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
13: The freezing point of water at sea level is?
- 32F
- 32C
- 0F
- -10C
14: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- a ling psychrometer doesn't have two theremometers.
- 2F difference
- nearly the same
- far apart or greater difference
15: What is the leaving chilled water set point for water chiller systems?
- 38F
- 66F
- 45F
- 55F
16: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
17: At higher altitudes, the boiling point of refrigerant is
- equal to the coefficient of water at 32F
- the same
- lower
- higher
18: Indirect systems using Group II refrigerants
- shall be used for mechanical equipment only
- shall be used in refrigeration system less than 1,000 lbs
- shall be used in refrigeration system in excess of 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
19: Each machinery room shall contain
- high and low pressure controls
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
20: A High-Probability System
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak form a failed connection or component of such system
21: Which refrigerant is lighter than air?
- R-717
- R-134a
- R-123
- R-11
22: What device should be used on low-temperature freezers?
- discharge muffler
- high capacity TXV
- oil separator
- hot-gas by-pass
23: Refrigerants shall be classified by
- toxicity and flammability
- maximum permissible quantities of each group
- requirements for commercial, industrial, and residential occupancies
- color codes
24: Single compound Refrigerants are classified by what two criteria?
- Flammability and toxicity
- Weight and color
- Temperature range and hazardousness
- Flammability and temperature range
25: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 15
- 18
- 24
- 10