Topics: All categories in the pool
1: What is the leaving chilled water set point for water chiller systems?
- 38F
- 45F
- 55F
- 66F
2: How many gallons of water do you need per pound of ammonia?
- 50
- 1
- 10
- 100
3: What type of relief valve is used on a CO2 system?
- rupture disc
- gate valve
- glove disc
- fusible plug
4: In an electrical circuit, what is potential measured in?
- Volts
- Amps
- Herys
- Ohms
5: Evaporators within 18" of a heating coil must be equipped with a
- low limit control
- high limit control
- zone valve
- pressure relief device
6: What section of ASHRAE-15 governs pressure vessels?
- Section 9 ASHRAE-15 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- Section 6 ASHRAE-34 ASME VIII unfired
- OSHA
7: If the power element on an expansion valve should lose its charge, the valve would
- Over feed
- Stay open
- Close
- Under feed
8: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.
9: If the power element of an expansion valve should lose its charge the valve would
- go closed
- underfeed the evaporator
- overfeed the evaporator
- go open
10: A cross charged power element on an expansion valve would normally be used in what temperature range?
- -100F to -40F
- 0F-38F
- -40F to 0F
- 30F to 50F
11: What type refrigerant is NOT ozone depleting?
- HCFC
- HFC
- Halon
- CFC
12: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
13: The best way to determine the voltage requirement for an electrical component is to
- read the nameplate data
- determine the capacity of the service panel
- check with the utility company
- read the voltage with a mulitmeter
14: Each machinery room shall contain
- high and low pressure controls
- a refrigerant detector located in an area where the refrigerant 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 toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
15: Which refrigerant is lighter than air?
- R-134a
- R-11
- R-123
- R-717
16: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- mixed occupancy
- commercial occupancy
- public assembly occupancy
- institutional occupancy
17: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 144 BTU
- 970 BTU
- 24,000 BTU
- 12,000 BTU
18: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 20 amps
- 24 amps
- There isn't enough information to answer.
- 10 amps
19: What is absolute humidity?
- the amount of moisture in the air per one pound of 50% RH air
- the amount of moisture in the air in grains of cubic feet of volume
- the amount of moisture in the air in grains of square feet of volume
- none of the above
20: Class T machine room
- shall include closets used for setting equipment
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
21: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- lower
- there is no Group B1 refrigerants
- higher
- the same
22: R-22 falls under which safety classification?
- A-2
- B-1
- A-1
- B-2
23: The location of a thermal bulb of a TXV affects
- the amount of liquid refrigerant in the evaporator
- the amount of liquid returning to the compressor
- subcooling
- the amount of liquid in the condenser.
24: What type of pressure relief device is used on a CO2 system?
- Gate valve
- Rupture disk
- Glove valve
- Fusible plug
25: Two systems using separate refrigerants that are superimposed upon one another is called
- indirect
- cascade
- booster
- single stage