Topics: All categories in the pool
1: How many refrigerant classifications are there for toxicity?
- 3
- 1
- 2
- 5
2: Total heat of a substance is considered
- sensible heat
- enthalpy
- specific heat
- empathetical
3: A relief valve discharge capacity is rated in
- temperature minus pounds of air per second divided by release rate squared
- PSIG
- PSIA
- Pounds of air per minute.
4: At higher altitudes, the boiling point of refrigerant is
- the same
- equal to the coefficient of water at 32F
- lower
- higher
5: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 100
- 100,000
- 1,000
- 10,000
6: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- leak checked
- moisture barrier
- insulated
7: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Water and soap
- Moisture and air
- Air and dirt
- Oil and water
8: 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.
- 110
- 90
- 100
- 80
9: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
10: 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
11: Low pressure systems have what kind of compressor?
- Rotary
- Reciprocating
- Centrifugal
- Scroll
12: How many gallons of water per pound of ammonia do you need?
- 20
- 5
- 1
- 15
13: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
14: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 75
- 20
- 15
- 50
15: 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
16: Where is the high-side float located on a chiller system?
- inside the chiller barrel
- discharge line
- liquid line
- flash line
17: What does an anemometer measure?
- amperage
- temperature
- voltage
- velocity
18: Cooling tower lowers condenser water temp by
- evaporative cooling
- running fans at 100%
- condensation
- running water thru a secondary heat exchanger
19: R-410A is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-1
- B-1
- A-2
20: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
21: Pressure is the equivalent of
- force
- force times area
- force per unit area
- area times force
22: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- lower
- there is no Group B1 refrigerants
- the same
- higher
23: RPM's of a centrifugal compressor are at approximately?
- 10,000
- 15,000
- 500
- 30,000
24: The high side float assembly meters refrigerant into the evaporator through the
- lower chamber of the low side
- upper chamber of the high side
- lower chamber of the high side
- upper chamber of the low side
25: What is an example of institutional occupancy?
- Hospital
- Dorms
- Shopping mall
- Football stadium