Topics: All categories in the pool
1: What does an anemometer measure?
- voltage
- amperage
- temperature
- velocity
2: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Insulated and cross broke
- Flanged and gasketed
- Welded and seamed.
3: How many refrigerant classifications are there for toxicity?
- 1
- 2
- 5
- 3
4: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
5: Machinery rooms must be vented to ______?
- outdoors
- unoccupied spaces
- neutralizing tank
- basement
6: What is the refrigerant chlorodifluoromethane?
- R-12
- R-123
- R-134a
- R-22
7: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
8: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
9: The measurement of heat in a particular substance is
- enthalpy
- sensible heat
- latent heat
- specific heat
10: "R" represents ___ in the Ohm's law formula
- capacitance
- amperage
- resistance
- voltage
11: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 330
- 200
- 100
12: By using nitrogen within a pipe during brazing operation,
- Exterior scale formation is minimized
- Discoloration is prevented
- Copper oxide formation is prevented
- The explosion hazard is confined
13: If your suction line is warmer than the room temperature, this may indicate
- an over charge
- a low charge
- plugged air filter
- below normal superheat
14: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 116
- 88
- 108
- 38
15: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 250
- 100
- 400
- 350
16: The best way to detect ammonia in brine is
- nessler regaent
- CO2 gas
- potassium of line
- carbonation of soda
17: The best way to determine the voltage requirement for an electrical component is to
- read the voltage with a mulitmeter
- check with the utility company
- read the nameplate data
- determine the capacity of the service panel
18: Where a refrigeration or air conditioning system is installed,
- The company who installed the system must notify the fire department in the jurisdiction where installed
- A field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressuers
- the form or certificate shall be authorized by the Department of Public Safety
19: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- on a conspicuous card located near the compressor
- inside the room, immediately adjacent to each door
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: 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
22: 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
23: A single pole-double throw switch uses how many wires?(excluding the ground)
- 3
- 5
- 4
- 2
24: Before replacing a seized compressor, the _______ should be determinded.
- cause of seizure
- current draw
- type of refrigerant
- designed head pressure
25: Joints in refrigeration piping must be _____ before being covered?
- Leak tested
- Insulated
- Inspected
- Pressurized