Topics: All categories in the pool
1: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
2: The formula for Pure Power in a resistance circuit is
- Watts = volts X amps
- Kw = volts X amps
- Watts X power factor
- Watts X amps.
3: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-2
- B-1
- A-1
- A-2
4: What is an example of institutional occupancy?
- Shopping mall
- Football stadium
- Hospital
- Dorms
5: What is NOT a positive displacement compressor.
- Rotary
- Centrifugal
- Scroll
- Reciprocating
6: A High-Probability System
- 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
- 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
7: Which of the following controllers would you expect to be most sensitive to temperature changes?
- low voltage t-stat
- aquastat
- immersion controller
- line voltage t-stat
8: Lithium-bromide, Li-Br, is best characterized as a
- sugar
- salt
- soil
- sand
9: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
- 1/2"
- 5/8"
- 3/8"
- 3/4"
10: Which refrigerant class listed below is the most flammable?
- B2
- A2
- C3
- A3
11: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
12: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted and protected from dirt, water, and other elements
- shall be posted on the compressor shell or electrical panel at the unit
13: Single compound Refrigerants are classified by what two criteria?
- Flammability and temperature range
- Weight and color
- Flammability and toxicity
- Temperature range and hazardousness
14: What is the refrigerant chlorodifluoromethane?
- R-134a
- R-123
- R-12
- R-22
15: What device measures the specific gravity of a substance?
- Thermometer
- Manometer
- Hygrometer
- Hydrometer
16: At higher altitudes, boiling temperatures
- are unaffected
- decrease
- increase
- depends on the refrigerant
17: An air conditioning system rated for 36,000 BTU's is equivalent to
- two tons of cooling
- three tons of cooling
- one ton of cooling
- 12,000 tons of cooling
18: All electrical work done on refrigeration systems must comply with
- NEC and Massachusetts Modifications
- OSHA
- Department of Energy
- ASHREA-15 Section 9.2.1
19: In a horizontal shell & tube condenser, the ammonia is liquefied by
- passing thru the tubes from top to bottom
- removing the latent heat of fusion
- water sprayed over condenser
- removing the latent heat of vaporization
20: 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
- 58
- 96
- 38
21: A secondary coolant is defined as
- any refrigerant direcly in contact with the cooling space for process cooling
- a low temperature refrigerant used for cascading systems
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
22: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the coolest evaporator
- Suction line at the compressor
- Suction line of the warmest evaporator
- Suction line prior to the accumulator of the lowest temperature system
23: How many groups of refrigerants are there?
- 7
- 3
- 5
- 1
24: What type of pressure relief device is used on a CO2 system?
- Glove valve
- Fusible plug
- Rupture disk
- Gate valve
25: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above