Florida AC Class B 2023 Exam Prep
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Questions and Answers

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?

0.048 in thickness

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?

<p>14 x 20</p> Signup and view all the answers

The voltage rating of any capacitor must be the one being replaced?

<p>Equal to or greater than</p> Signup and view all the answers

An 18 inch diameter connector requires a minimum nominal galvanized thickness of?

<p>16 gauge</p> Signup and view all the answers

The outer jacket of a flexible duct section ______________ be interposed between the flange of the duct collar fitting and the flexible duct.

<p>Shall not</p> Signup and view all the answers

The maximum temperature inside fibrous glass duct with continuous operation is?

<p>250° F</p> Signup and view all the answers

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 ____________________?

<p>1-1/2&quot; wg</p> Signup and view all the answers

Which of the following shall be equipped with expansion tanks?

<p>Liquid single phase solar energy systems</p> Signup and view all the answers

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?

<p>4.0</p> Signup and view all the answers

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?

<p>20</p> Signup and view all the answers

According to the Florida Contractors Manual, for general rigging, the Safety Factor is ___________ for materials.

<p>5</p> Signup and view all the answers

Forms and shores in concrete shall not be removed until:

<p>The concrete has gained sufficient strength to support its weight and superimposed loads</p> Signup and view all the answers

Service openings in air ducts must be identified with letters having a minimum height of how many inches?

<p>1/2</p> Signup and view all the answers

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?

<p>Stoker-fired furnaces</p> Signup and view all the answers

All seams, joints, penetrations, and duct-to-hood collar connections for exhaust duct systems shall have _______________________________?

<p>Liquid-tight continuous external welds</p> Signup and view all the answers

To check for shorted motor windings, first...

<p>Remove all external wiring from the motor terminals</p> Signup and view all the answers

The register has 288 square inches. The velocity is 500 feet per minute. The air volume is?

<p>1,000 CFPM</p> Signup and view all the answers

The dew point of air depends on its _____________?

<p>Temperature &amp; relative humidity</p> Signup and view all the answers

When troubleshooting a refrigeration problem involving a sweating or frosted suction line, one probable cause is?

<p>Expansion valve stuck open</p> Signup and view all the answers

A 24 inch by 16 inch rectangular duct with a 1.5 inch flexible liner will have exterior dimensions of?

<p>27 inches by 19 inches</p> Signup and view all the answers

When staple flaps are not present to hold seams and joints in position prior to application of the closure system what should be used?

<p>Cross-tabs</p> Signup and view all the answers

The theoretical maximum effectiveness of the counter-flow device (air-to-air) is?

<p>100%</p> Signup and view all the answers

Which is not a method for joining PVC pipe?

<p>Push-on (C)</p> Signup and view all the answers

Factory-made vents listed by a nationally recognized testing agency for venting listed or approved appliances equipped to burn oil are _______________ ?

<p>Type L Vents</p> Signup and view all the answers

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?

<p>4.45</p> Signup and view all the answers

Of prime importance to reliable torch brazing is?

<p>The general cleanliness of all surfaces</p> Signup and view all the answers

The best way to check a capacitor is by the use of a/an _______________________ ?

<p>Capacitor analyzer</p> Signup and view all the answers

When ropes are used to define control access areas the rope shall have a minimum breaking strength of:

<p>200 Lbs</p> Signup and view all the answers

When checking a room thermostat for accuracy with a thermometer, the contacts should 'make' (close) at?

<p>No more than 2° above the temperature indicated by the thermometer</p> Signup and view all the answers

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 ____________________________?

<p>Fire Damper</p> Signup and view all the answers

A central warm air heating system through which air is circulated by gravity is a(n) _________________?

<p>Gravity system</p> Signup and view all the answers

Filters for exhaust duct systems shall be how many feet above the appliance-cooking surface?

<p>4'</p> Signup and view all the answers

To braze steel to copper, use?

<p>Silver brazing alloys</p> Signup and view all the answers

An improperly located feeler bulb will result in a?

<p>Low suction pressure</p> Signup and view all the answers

The official NFPA definition of a(n) ____________________ system is a central warm air heating system through which air is circulated by gravity.

<p>Gravity</p> Signup and view all the answers

The minimum aluminum equivalent required to replace 22 gauge galvanized steel is?

<p>.043</p> Signup and view all the answers

All sheet metal screws penetrating duct board shall be?

<p>1/2 inch (12.7 mm) longer than the board thickness</p> Signup and view all the answers

Associated directly with the addition (evaporation) or removal (condensation) of water vapor from moist heat is _____________________________________

<p>The transfer of latent heat</p> Signup and view all the answers

The flange used to seal off the end of a pipe is the?

<p>Blind flange</p> Signup and view all the answers

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?

<p>1/3</p> Signup and view all the answers

Residential sliding glass doors shall have an air infiltration rate of no more than ________________ cfm per square foot.

<p>0.3</p> Signup and view all the answers

Applying 'finger' pressure to check for correct belt tension should result in approximately ________________ inch(es) total deflection.

<p>1</p> Signup and view all the answers

Exposure to impulse or impact noise should not exceed:

<p>140 dB peak sound pressure level</p> Signup and view all the answers

The type of relay which is positional type and must be properly mounted for satisfactory operation?

<p>Amperage (current) relays</p> Signup and view all the answers

Air ducts shall be permitted to be _________________ and shall be constructed of materials and sealed to satisfying use requirements for the air duct system.

<p>Rigid or flexible</p> Signup and view all the answers

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.

<p>Forced air</p> Signup and view all the answers

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 ________________________________?

<p>3 feet above any air intake located within 10 feet horizontally</p> Signup and view all the answers

Do not use hand-held instruments to take high voltage measurements higher than?

<p>599</p> Signup and view all the answers

A SEER of 10 means?

<p>That the unit provides 10 BTU's per watt-hour of electricity</p> Signup and view all the answers

Supply ducts in residential attics shall be insulated to a minimum of _____________________?

<p>R-6</p> Signup and view all the answers

Metal nosing shall be used on upstream edges of liners at every transverse joint when velocities exceed?

<p>4,000 fpm (20.3 mps)</p> Signup and view all the answers

Most dry-type transformers range from _____________% to _____________% efficient, due mostly from losses that occur for the core (magnetizing), and coils (resistance and impedance).

<p>93%-98%</p> Signup and view all the answers

The type of starting relays used on motors of almost any size is ________________?

<p>Potential (current) relays</p> Signup and view all the answers

The operating temperature is 140 degrees F. Waylon is using polyvinyl chloride pipe 4 inches in diameter. The recommended support spacing is?

<p>5.6'</p> Signup and view all the answers

Contacts should 'make' at no more than ____________ degrees above the temperature indicated by the thermometer?

<p>2</p> Signup and view all the answers

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

<p>Seasonal</p> Signup and view all the answers

Hard start capacitor kits should be wired in?

<p>Parallel</p> Signup and view all the answers

Excavations 8' or less in depth which have unsupported, vertically-sided lower portions, shall have a maximum vertical side of ___________________ feet.

<p>3.5</p> Signup and view all the answers

The amperage (current) relay is an electromagnetic-type relay and must be _____________________?

<p>Properly mounted for satisfactory operation</p> Signup and view all the answers

The clearance from metal air ducts to assemblies constructed of combustible materials, including plaster on wood lath, shall not be?

<p>Less than 1/2 inch</p> Signup and view all the answers

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.

<p>18</p> Signup and view all the answers

The air velocity through any duct shall be?

<p>Not less than 500 feet per minute</p> Signup and view all the answers

Which is not a type of main burner?

<p>Inset (B)</p> Signup and view all the answers

The cooling efficiency of a heat pump or air conditioner is rated by its ___________________?

<p>SEER</p> Signup and view all the answers

Broward County is in which designation for climate zone, moisture regime, and warm humid designation?

<p>1A warm-humid</p> Signup and view all the answers

Collars to which flexible duct is attached shall be a minimum of?

<p>2&quot; in length</p> Signup and view all the answers

The maximum hanger spacing for duct 48 inches or greater is?

<p>4'</p> Signup and view all the answers

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:

<p>16% in homes and 30% in commercial buildings</p> Signup and view all the answers

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

<p>Central warm air heating system</p> Signup and view all the answers

Fire dampers are not required when sub-ducts are at least how many feet long?

<p>1.83'</p> Signup and view all the answers

A single phase magnetic starter voltage connected T-1 and T-2 is indicative of?

<p>Continuity</p> Signup and view all the answers

When replacing a heating relay, the service technician should always use?

<p>An exact replacement</p> Signup and view all the answers

An open winding is indicated by a resistance reading on the ohmmeter of?

<p>Infinity</p> Signup and view all the answers

Service openings in air ducts must be identified with letters to ____________________?

<p>Indicate the location of the fire protection device(s) within</p> Signup and view all the answers

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.)

<p>22 gauge galvanized steel</p> Signup and view all the answers

Employees must use a safety belt or equivalent fall protection when on the face of formwork or reinforcing steel at height of more than?

<p>6 feet</p> Signup and view all the answers

A tinted 1/4 inch single-glazed window has a shading coefficient of ________________?

<p>0.78</p> Signup and view all the answers

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?

<p>36</p> Signup and view all the answers

For steam service, the valve recognized as the best is the ________________________

<p>Solid wedge gate valve</p> Signup and view all the answers

Vertical riser The two air system categories are:

<p>Single path and dual path</p> Signup and view all the answers

This allows the oil pressure to build up to preset operating pressure on compressor start:

<p>Time delay switch</p> Signup and view all the answers

When using a rectangular aluminum duct at 3 inch wg., to replace 22 gauge galvanized steel, the minimum aluminum equivalent to use is ______________?

<p>.043</p> Signup and view all the answers

A/an _________________________ separates inside and outside pieces of the window frame with an insulating material which improves U-factors

<p>Thermal break</p> Signup and view all the answers

High voltage measurements involve volts or more of electricity.

<p>600 volts</p> Signup and view all the answers

Toeboards, when used as a protection against falling objects, shall have a minimum vertical height of:

<p>3-1/2&quot;</p> Signup and view all the answers

A SEER of 10 means _____________________________

<p>That the unit provides 10 BTU's per watt-hour of electricity</p> Signup and view all the answers

What is the purpose of the thermocouple thermometer in heating, air conditioning and refrigeration system?

<p>Used to take accurate temperature</p> Signup and view all the answers

A refueling operation in a private garage requires _______ square foot per 1,000 cubic feet of garage volume?

<p>1/2</p> Signup and view all the answers

Given 20 MFD and 30 MFD connected in series, the capacitance would be ___________________?

<p>12</p> Signup and view all the answers

Multiple ducts ________________ be permitted in a single enclosure unless acceptable to the authority having jurisdiction.

<p>Shall not</p> Signup and view all the answers

Opaque Swinging doors require a U-value of _____________ when installed in a climate zone 3, group R?

<p>U-0.61</p> Signup and view all the answers

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?

<p>A maximum flame spread index of 25 and a maximum smoke developed index of 50 when in the final dry state</p> Signup and view all the answers

Ezekiel must change the 45-inch round duct to an equivalent rectangular duct. The correct rectangular duct size is ____________________________?

<p>40 inches by 40 inches</p> Signup and view all the answers

A volt meter yielding the highest OHMs would be connected ____________________________?

<p>S to R</p> Signup and view all the answers

Which of the following is the property of matter that responds to gravitational attraction?

<p>Mass</p> Signup and view all the answers

What does AFUE stand for?

<p>Annual fuel utilization efficiency</p> Signup and view all the answers

Self-supporting portable ladders shall be capable of supporting without failure at least _______________ times the maximum intended load.

<p>4 times</p> Signup and view all the answers

According to the CM and OSHA, OSHA records for employees who report to a fixed location but work elsewhere should be kept at ______________________.

<p>At the place where the employees report every day</p> Signup and view all the answers

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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