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Questions and Answers
A refrigerant leak _________________________________?
A refrigerant leak _________________________________?
Should be found & repaired
According to NFPA 96, commercial cooking hoods designed for collecting cooking vapors and residues shall be constructed of and be supported by steel not less than?
According to NFPA 96, commercial cooking hoods designed for collecting cooking vapors and residues shall be constructed of and be supported by steel not less than?
0.048 in thickness
The result of moisture freezing in the refrigerant flow control orifice is poor refrigeration, accompanied by a ____________________________________?
The result of moisture freezing in the refrigerant flow control orifice is poor refrigeration, accompanied by a ____________________________________?
Lower than normal suction pressure
One side of a rectangular duct is 14 inches. The CFM's are 2,000. The friction is 0.1. The duct size is?
One side of a rectangular duct is 14 inches. The CFM's are 2,000. The friction is 0.1. The duct size is?
The voltage rating of any capacitor must be the one being replaced?
The voltage rating of any capacitor must be the one being replaced?
An 18 inch diameter connector requires a minimum nominal galvanized thickness of?
An 18 inch diameter connector requires a minimum nominal galvanized thickness of?
The outer jacket of a flexible duct section ______________ be interposed between the flange of the duct collar fitting and the flexible duct.
The outer jacket of a flexible duct section ______________ be interposed between the flange of the duct collar fitting and the flexible duct.
The maximum temperature inside fibrous glass duct with continuous operation is?
The maximum temperature inside fibrous glass duct with continuous operation is?
According to SMACNA HVAC Duct Construction Standards, the maximum negative pressure of 48" diameter round duct constructed of 20 gauge galvanized steel, spiral seam is ____________________?
According to SMACNA HVAC Duct Construction Standards, the maximum negative pressure of 48" diameter round duct constructed of 20 gauge galvanized steel, spiral seam is ____________________?
Which of the following shall be equipped with expansion tanks?
Which of the following shall be equipped with expansion tanks?
A steam type heating system has a fluid design operating temperature of 275 degrees Fahrenheit and a nominal pipe diameter of one inch. The minimum pipe insulation should be how many inches?
A steam type heating system has a fluid design operating temperature of 275 degrees Fahrenheit and a nominal pipe diameter of one inch. The minimum pipe insulation should be how many inches?
Cooling towers shall be provided with a direct connection to a water supply through an individual float control valve. The plume discharge shall not be less than how many feet away from ventilation inlets?
Cooling towers shall be provided with a direct connection to a water supply through an individual float control valve. The plume discharge shall not be less than how many feet away from ventilation inlets?
According to the Florida Contractors Manual, for general rigging, the Safety Factor is ___________ for materials.
According to the Florida Contractors Manual, for general rigging, the Safety Factor is ___________ for materials.
Forms and shores in concrete shall not be removed until:
Forms and shores in concrete shall not be removed until:
Service openings in air ducts must be identified with letters having a minimum height of how many inches?
Service openings in air ducts must be identified with letters having a minimum height of how many inches?
Where a hand-fired, solid fuel-burning furnace is equipped with a fan to circulate the air, it shall be equipped with fan controls as required for?
Where a hand-fired, solid fuel-burning furnace is equipped with a fan to circulate the air, it shall be equipped with fan controls as required for?
All seams, joints, penetrations, and duct-to-hood collar connections for exhaust duct systems shall have _______________________________?
All seams, joints, penetrations, and duct-to-hood collar connections for exhaust duct systems shall have _______________________________?
To check for shorted motor windings, first...
To check for shorted motor windings, first...
The register has 288 square inches. The velocity is 500 feet per minute. The air volume is?
The register has 288 square inches. The velocity is 500 feet per minute. The air volume is?
The dew point of air depends on its _____________?
The dew point of air depends on its _____________?
When troubleshooting a refrigeration problem involving a sweating or frosted suction line, one probable cause is?
When troubleshooting a refrigeration problem involving a sweating or frosted suction line, one probable cause is?
A 24 inch by 16 inch rectangular duct with a 1.5 inch flexible liner will have exterior dimensions of?
A 24 inch by 16 inch rectangular duct with a 1.5 inch flexible liner will have exterior dimensions of?
When staple flaps are not present to hold seams and joints in position prior to application of the closure system what should be used?
When staple flaps are not present to hold seams and joints in position prior to application of the closure system what should be used?
The theoretical maximum effectiveness of the counter-flow device (air-to-air) is?
The theoretical maximum effectiveness of the counter-flow device (air-to-air) is?
Which is not a method for joining PVC pipe?
Which is not a method for joining PVC pipe?
Factory-made vents listed by a nationally recognized testing agency for venting listed or approved appliances equipped to burn oil are _______________ ?
Factory-made vents listed by a nationally recognized testing agency for venting listed or approved appliances equipped to burn oil are _______________ ?
A steam type heating system has a fluid design operating temperature of 275 degrees Fahrenheit and a nominal pipe diameter of one and one-half inches. The minimum pipe insulation should be how many inches?
A steam type heating system has a fluid design operating temperature of 275 degrees Fahrenheit and a nominal pipe diameter of one and one-half inches. The minimum pipe insulation should be how many inches?
Of prime importance to reliable torch brazing is?
Of prime importance to reliable torch brazing is?
The best way to check a capacitor is by the use of a/an _______________________ ?
The best way to check a capacitor is by the use of a/an _______________________ ?
When ropes are used to define control access areas the rope shall have a minimum breaking strength of:
When ropes are used to define control access areas the rope shall have a minimum breaking strength of:
When checking a room thermostat for accuracy with a thermometer, the contacts should 'make' (close) at?
When checking a room thermostat for accuracy with a thermometer, the contacts should 'make' (close) at?
Outside air intakes shall be located so as to minimize the introduction of fire into the building from combustible buildings and hazardous facilities, or the intakes shall be equipped with an approved ____________________________?
Outside air intakes shall be located so as to minimize the introduction of fire into the building from combustible buildings and hazardous facilities, or the intakes shall be equipped with an approved ____________________________?
A central warm air heating system through which air is circulated by gravity is a(n) _________________?
A central warm air heating system through which air is circulated by gravity is a(n) _________________?
Filters for exhaust duct systems shall be how many feet above the appliance-cooking surface?
Filters for exhaust duct systems shall be how many feet above the appliance-cooking surface?
To braze steel to copper, use?
To braze steel to copper, use?
An improperly located feeler bulb will result in a?
An improperly located feeler bulb will result in a?
The official NFPA definition of a(n) ____________________ system is a central warm air heating system through which air is circulated by gravity.
The official NFPA definition of a(n) ____________________ system is a central warm air heating system through which air is circulated by gravity.
The minimum aluminum equivalent required to replace 22 gauge galvanized steel is?
The minimum aluminum equivalent required to replace 22 gauge galvanized steel is?
All sheet metal screws penetrating duct board shall be?
All sheet metal screws penetrating duct board shall be?
Associated directly with the addition (evaporation) or removal (condensation) of water vapor from moist heat is _____________________________________
Associated directly with the addition (evaporation) or removal (condensation) of water vapor from moist heat is _____________________________________
The flange used to seal off the end of a pipe is the?
The flange used to seal off the end of a pipe is the?
Holes bored for pipes shall not be within 2" of the top or bottom of the joist and the diameter of any such hole shall not exceed what of the depth of the joist?
Holes bored for pipes shall not be within 2" of the top or bottom of the joist and the diameter of any such hole shall not exceed what of the depth of the joist?
Residential sliding glass doors shall have an air infiltration rate of no more than ________________ cfm per square foot.
Residential sliding glass doors shall have an air infiltration rate of no more than ________________ cfm per square foot.
Applying 'finger' pressure to check for correct belt tension should result in approximately ________________ inch(es) total deflection.
Applying 'finger' pressure to check for correct belt tension should result in approximately ________________ inch(es) total deflection.
Exposure to impulse or impact noise should not exceed:
Exposure to impulse or impact noise should not exceed:
The type of relay which is positional type and must be properly mounted for satisfactory operation?
The type of relay which is positional type and must be properly mounted for satisfactory operation?
Air ducts shall be permitted to be _________________ and shall be constructed of materials and sealed to satisfying use requirements for the air duct system.
Air ducts shall be permitted to be _________________ and shall be constructed of materials and sealed to satisfying use requirements for the air duct system.
A central warm air heating system that is equipped with a fan or blower that provides the primary means for circulation of air is called a _____________________ system.
A central warm air heating system that is equipped with a fan or blower that provides the primary means for circulation of air is called a _____________________ system.
Rooftop terminations shall be arranged with or provided with a minimum of 10 feet of clearance from the outlet to adjacent buildings, property lines and air intakes. A vertical separation shall be permitted where space limitations absolutely prevent a 10-foot horizontal separation from an air intake, with the exhaust outlet being a minimum of ________________________________?
Rooftop terminations shall be arranged with or provided with a minimum of 10 feet of clearance from the outlet to adjacent buildings, property lines and air intakes. A vertical separation shall be permitted where space limitations absolutely prevent a 10-foot horizontal separation from an air intake, with the exhaust outlet being a minimum of ________________________________?
Do not use hand-held instruments to take high voltage measurements higher than?
Do not use hand-held instruments to take high voltage measurements higher than?
A SEER of 10 means?
A SEER of 10 means?
Supply ducts in residential attics shall be insulated to a minimum of _____________________?
Supply ducts in residential attics shall be insulated to a minimum of _____________________?
Metal nosing shall be used on upstream edges of liners at every transverse joint when velocities exceed?
Metal nosing shall be used on upstream edges of liners at every transverse joint when velocities exceed?
Most dry-type transformers range from _____________% to _____________% efficient, due mostly from losses that occur for the core (magnetizing), and coils (resistance and impedance).
Most dry-type transformers range from _____________% to _____________% efficient, due mostly from losses that occur for the core (magnetizing), and coils (resistance and impedance).
The type of starting relays used on motors of almost any size is ________________?
The type of starting relays used on motors of almost any size is ________________?
The operating temperature is 140 degrees F. Waylon is using polyvinyl chloride pipe 4 inches in diameter. The recommended support spacing is?
The operating temperature is 140 degrees F. Waylon is using polyvinyl chloride pipe 4 inches in diameter. The recommended support spacing is?
Contacts should 'make' at no more than ____________ degrees above the temperature indicated by the thermometer?
Contacts should 'make' at no more than ____________ degrees above the temperature indicated by the thermometer?
The estimated total cooling of a central air conditioner in BTUs during its normal usage period for cooling (not to exceed 12 months) divided by the total electric energy input in watt-hours during the same period is called the __________________ Energy Efficiency Ratio
The estimated total cooling of a central air conditioner in BTUs during its normal usage period for cooling (not to exceed 12 months) divided by the total electric energy input in watt-hours during the same period is called the __________________ Energy Efficiency Ratio
Hard start capacitor kits should be wired in?
Hard start capacitor kits should be wired in?
Excavations 8' or less in depth which have unsupported, vertically-sided lower portions, shall have a maximum vertical side of ___________________ feet.
Excavations 8' or less in depth which have unsupported, vertically-sided lower portions, shall have a maximum vertical side of ___________________ feet.
The amperage (current) relay is an electromagnetic-type relay and must be _____________________?
The amperage (current) relay is an electromagnetic-type relay and must be _____________________?
The clearance from metal air ducts to assemblies constructed of combustible materials, including plaster on wood lath, shall not be?
The clearance from metal air ducts to assemblies constructed of combustible materials, including plaster on wood lath, shall not be?
An unlisted, automatically fired system, with a temperature limit control that cannot be set higher than 250 degrees Fahrenheit, burns gas fuel, is installed in a room that is large in comparison with the size of the appliance. For safety reasons, this system must have a minimum clearance of ____________ inches in front.
An unlisted, automatically fired system, with a temperature limit control that cannot be set higher than 250 degrees Fahrenheit, burns gas fuel, is installed in a room that is large in comparison with the size of the appliance. For safety reasons, this system must have a minimum clearance of ____________ inches in front.
The air velocity through any duct shall be?
The air velocity through any duct shall be?
Which is not a type of main burner?
Which is not a type of main burner?
The cooling efficiency of a heat pump or air conditioner is rated by its ___________________?
The cooling efficiency of a heat pump or air conditioner is rated by its ___________________?
Broward County is in which designation for climate zone, moisture regime, and warm humid designation?
Broward County is in which designation for climate zone, moisture regime, and warm humid designation?
Collars to which flexible duct is attached shall be a minimum of?
Collars to which flexible duct is attached shall be a minimum of?
The maximum hanger spacing for duct 48 inches or greater is?
The maximum hanger spacing for duct 48 inches or greater is?
Adjusting the thermostat control points up or down to suit space needs during sleeping hours or when buildings are unoccupied can reduce heating and cooling:
Adjusting the thermostat control points up or down to suit space needs during sleeping hours or when buildings are unoccupied can reduce heating and cooling:
The terminal According to NFPA, a heating system consisting of a heat exchanger with an outer casing or jacket, or an electric heating unit, connected to a supply system and a return system is defined as a/an
The terminal According to NFPA, a heating system consisting of a heat exchanger with an outer casing or jacket, or an electric heating unit, connected to a supply system and a return system is defined as a/an
Fire dampers are not required when sub-ducts are at least how many feet long?
Fire dampers are not required when sub-ducts are at least how many feet long?
A single phase magnetic starter voltage connected T-1 and T-2 is indicative of?
A single phase magnetic starter voltage connected T-1 and T-2 is indicative of?
When replacing a heating relay, the service technician should always use?
When replacing a heating relay, the service technician should always use?
An open winding is indicated by a resistance reading on the ohmmeter of?
An open winding is indicated by a resistance reading on the ohmmeter of?
Service openings in air ducts must be identified with letters to ____________________?
Service openings in air ducts must be identified with letters to ____________________?
According to SMACNA, a 30 inch round spiral seam duct installed in an air distribution system should be constructed of? (Assume 2" WG positive static pressure.)
According to SMACNA, a 30 inch round spiral seam duct installed in an air distribution system should be constructed of? (Assume 2" WG positive static pressure.)
Employees must use a safety belt or equivalent fall protection when on the face of formwork or reinforcing steel at height of more than?
Employees must use a safety belt or equivalent fall protection when on the face of formwork or reinforcing steel at height of more than?
A tinted 1/4 inch single-glazed window has a shading coefficient of ________________?
A tinted 1/4 inch single-glazed window has a shading coefficient of ________________?
According to the CODE, the door or access opening into an equipment room containing a furnace shall not be less than how many inches in width?
According to the CODE, the door or access opening into an equipment room containing a furnace shall not be less than how many inches in width?
For steam service, the valve recognized as the best is the ________________________
For steam service, the valve recognized as the best is the ________________________
Vertical riser The two air system categories are:
Vertical riser The two air system categories are:
This allows the oil pressure to build up to preset operating pressure on compressor start:
This allows the oil pressure to build up to preset operating pressure on compressor start:
When using a rectangular aluminum duct at 3 inch wg., to replace 22 gauge galvanized steel, the minimum aluminum equivalent to use is ______________?
When using a rectangular aluminum duct at 3 inch wg., to replace 22 gauge galvanized steel, the minimum aluminum equivalent to use is ______________?
A/an _________________________ separates inside and outside pieces of the window frame with an insulating material which improves U-factors
A/an _________________________ separates inside and outside pieces of the window frame with an insulating material which improves U-factors
High voltage measurements involve volts or more of electricity.
High voltage measurements involve volts or more of electricity.
Toeboards, when used as a protection against falling objects, shall have a minimum vertical height of:
Toeboards, when used as a protection against falling objects, shall have a minimum vertical height of:
A SEER of 10 means _____________________________
A SEER of 10 means _____________________________
What is the purpose of the thermocouple thermometer in heating, air conditioning and refrigeration system?
What is the purpose of the thermocouple thermometer in heating, air conditioning and refrigeration system?
A refueling operation in a private garage requires _______ square foot per 1,000 cubic feet of garage volume?
A refueling operation in a private garage requires _______ square foot per 1,000 cubic feet of garage volume?
Given 20 MFD and 30 MFD connected in series, the capacitance would be ___________________?
Given 20 MFD and 30 MFD connected in series, the capacitance would be ___________________?
Multiple ducts ________________ be permitted in a single enclosure unless acceptable to the authority having jurisdiction.
Multiple ducts ________________ be permitted in a single enclosure unless acceptable to the authority having jurisdiction.
Opaque Swinging doors require a U-value of _____________ when installed in a climate zone 3, group R?
Opaque Swinging doors require a U-value of _____________ when installed in a climate zone 3, group R?
Where supplementary materials for air distribution systems are to be applied with adhesives, they shall be tested with such adhesives applied, or the adhesives used shall have?
Where supplementary materials for air distribution systems are to be applied with adhesives, they shall be tested with such adhesives applied, or the adhesives used shall have?
Ezekiel must change the 45-inch round duct to an equivalent rectangular duct. The correct rectangular duct size is ____________________________?
Ezekiel must change the 45-inch round duct to an equivalent rectangular duct. The correct rectangular duct size is ____________________________?
A volt meter yielding the highest OHMs would be connected ____________________________?
A volt meter yielding the highest OHMs would be connected ____________________________?
Which of the following is the property of matter that responds to gravitational attraction?
Which of the following is the property of matter that responds to gravitational attraction?
What does AFUE stand for?
What does AFUE stand for?
Self-supporting portable ladders shall be capable of supporting without failure at least _______________ times the maximum intended load.
Self-supporting portable ladders shall be capable of supporting without failure at least _______________ times the maximum intended load.
According to the CM and OSHA, OSHA records for employees who report to a fixed location but work elsewhere should be kept at ______________________.
According to the CM and OSHA, OSHA records for employees who report to a fixed location but work elsewhere should be kept at ______________________.
Study Notes
Refrigeration and Duct Standards
- Refrigerant leaks should be identified and repaired promptly to maintain system efficiency.
- Commercial cooking hoods, as per NFPA 96, must be made of steel with a minimum thickness of 0.048 inches.
- Moisture freezing in refrigerant lines can lead to poor refrigeration and lower than normal suction pressure.
- A rectangular duct measuring 14 inches has a duct size of 14 x 20 inches when CFM's are 2,000 and friction is .1.
Equipment Specifications
- Capacitor voltage ratings must match or exceed that of the component being replaced.
- An 18-inch diameter connector demands a minimum galvanized thickness of 16 gauge.
- The outer flexible duct jacket should not be placed between duct flanges.
- Fibrous glass duct maximum operating temperature is capped at 250°F.
Duct Pressure and Components
- According to SMACNA, a 48-inch diameter round duct made of 20 gauge galvanized steel can handle a maximum negative pressure of 1-1/2" wg.
- Systems for solar energy must include expansion tanks.
- Steam heating systems with 1-inch nominal pipe diameter require a minimum of 4 inches of insulation.
- Cooling towers must maintain a minimum discharge distance of 20 feet from ventilation inlets.
Safety and Construction Regulations
- General rigging safety factors in Florida are set at 5 for materials.
- Concrete forms should not be removed until the concrete has achieved sufficient strength.
- Service openings in air ducts must display letters at least 0.5 inches tall for identification.
- All exhaust duct seams must have liquid-tight continuous external welds for safety.
Operational Guidelines
- Shorted motor windings can be checked by removing external wiring from motor terminals.
- Air volume is calculated by multiplying the register area (288 square inches) by velocity (500 ft/min), resulting in 1,000 CFPM.
- Dew point is influenced by air temperature and relative humidity.
- Common issues leading to refrigeration problems, like a sweating suction line, include an expansion valve stuck in the open position.
Ductwork Insulation and Joining Techniques
- Insulation thickness for piping in steam systems needs to be 4.45 inches for 1.5-inch diameters.
- Factors in construction include maintaining the clearance of air ducts at least 0.5 inches from combustible materials.
- Various ducts require different aluminum gauge equivalents to replace galvanized steel.
- Different methods exist for joining PVC pipes, excluding the push-on technique.
Environmental and Acoustic Regulations
- Rooftop terminations must have a 10-foot clearance from buildings and 3-foot vertical clearance from air intakes.
- When measuring, exposure to impact noise must remain under 140 dB peak sound pressure level.
Energy Efficiency and Regulation Compliance
- A SEER rating of 10 indicates a unit generating 10 BTUs per watt-hour.
- Air distribution systems in attics must meet a minimum R-6 insulation.
- For optimal efficiency, establish proper thermostat control points, ensuring accuracy within 2 degrees.
Safety Equipment and Procedures
- Employees must use safety belts when working at heights over 6 feet on formwork.
- Hydraulic systems or devices must be tested for their efficiency and performance under operational conditions.
- High voltage measurements should not be taken with handheld devices exceeding 600 volts.
Miscellaneous Regulations and Guidelines
- Solid wedge gate valves are preferred for steam service applications.
- The maximum permitted air velocity through ducts is not less than 500 feet per minute.
- All duct openings for airflow must be identified for the location of fire protection devices for compliance with safety regulations.
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Test your knowledge with flashcards covering essential concepts for the Florida AC Class B 2023 exam. Each card provides critical information, ensuring you are well-prepared for the exam with correct answers. Perfect for quick review and retention of key topics in HVAC and refrigerant management.
