Topics: All categories in the pool
1: How many volts would you read on a 480V system phase to phase?
- 480
- 1/3 the voltage
- 277
2: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- Lithium bromide
- ammonia
- HCFC-123
- CFC-11
3: When an inspection is needed, how often must it be done?
- annually
- every 36 months
- every 18 months
- every 24 months
4: A thermometer inside a duct measures ____ heat.
- hidden
- specific
- sensible
- latent
5: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection
- over pressure protection and a rupture disc
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection as well as a temperature protection device
6: Cooling tower lowers condenser water temp by
- evaporative cooling
- condensation
- running fans at 100%
- running water thru a secondary heat exchanger
7: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
8: How many refrigerant classifications are there for toxicity?
- 2
- 5
- 1
- 3
9: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- cooling temperature set-point
- adjustment of the spring tension of the TXV
- opening at the pump inlet
- opening at the pump outlet
10: Class T machine room
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
- shall include closets used for setting equipment
11: Evaporators within 18" of a heating coil must be equipped with a
- pressure relief device
- zone valve
- high limit control
- low limit control
12: In an A/C unit, dirty filters will cause
- low oil pressure
- low suction pressure
- high suction pressur
- high discharge pressure
13: If the power element of an expansion valve should lose its charge the valve would
- overfeed the evaporator
- underfeed the evaporator
- go closed
- go open
14: On a single phase motor, when does the start winding cut out?
- 100% of its RLA speed
- 75% of its RLA speed
- 50% of its RLA speed
- 25% of its RLA speed
15: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
16: Give an example of a secondary coolant?
- R-410A
- R-718
- R-12
- R-717
17: What is the refrigerant dichlorodifluoromethane?
- R-134A
- R-123
- R-22
- R-12
18: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- public assembly occupancy
- commercial occupancy
- institutional occupancy
- mixed occupancy
19: How many BTU's is produced by one watt of energy
- 2.57
- 3.00
- 3.41
- 1
20: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
21: A class B1 refrigerant is considered
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic but non-flammable
- toxic and somewhat flammable
22: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1.2
- 2.2
- 1
- 1.5
23: Ohm's Law indicates Amps X Resistance = ___________.
- Volts
- Impedance
- Current
- Ohms
24: The low pressure oil safety switch
- resets itself automatically
- must be reset manually
- resets itself after the time delay has terminated
- never trips
25: Which of the following is not an air velocity meter?
- Anemotherm
- Velometer
- Hydrometer
- Anemometer