Select the statement that better describes how a stud wall cavity is proposed to be used for a supply air plenum for an area of a structure:

shall comply with the floor penetration requirements of the International Fire Code

may be part of a required fire-resistance

can convey air from multiple floors

The return air from a dwelling unit shall not be discharged through the cooling system into

a cooridor which opens to the exterior

What system problem can be avoided by correctly sizing the low-side filter drier at the compressor end of the suction line?

Resistance to flow of the vaporized refrigerant

According to the International Fire Code, duct smoke detectors in heating and AC systems must be connected to what?

electrical supply to the building

The operation of the thermostatic expansion valve is controlled by the temperature of the thermal expansion valve and the pressure in the evaporator. Therefore, when does the needle valve in the refrigeration system normally open?

When the evaporator pressure is low and the temperature is above normal.

Low evaporator pressure, and temperature is above normal.

Compressor pressure is reduced in evaporator.

Evaporator liquid level is excessively low.

heat evolved from life process of fruits and vegatables

formation of moisture due to evaporator effect

Exposed optical-fiber raceways installed in concealed spaces above suspended ceilings used as air plenums shall ___.

exhibit a flame travel/spread of five feet or less

NOT be permitted by the 2003 International Mechanical Code

have a maximum flame-spread index of 25

have a maximum smoke-developed rating of 50

How can you explain the definition for Differential Adjustment control?

Temperature at which the switch turns the system on and the temperature at which it turns it off

It is the set point and the temperature at which the switch turns the system off

It is the set point and the temperature at which the heat anticipator begins to produce heat

It is the set point and the temperature at which the switch turns the system on

A technician is fixing a leak on a silver soldered joint in a refrigerant pipe. He must do what?

apply flux to the outside of the tubing.

light oil the ends of the tubing inside and out.

clean the inside of the fittings with emery cloth.

Where all combustion air is provided by a mechanical air supply system, the combustion air shall be supplied from the outdoors at a minimum rate of ___ of the total input rating of all appliances located within the space.

0.35 cubic feet per minute per 1,000 Btu/h

0.15 cubic feet per minute per 1,000 Btu/h

0.25 cubic feet per minute per 1,000 Btu/h

0.45 cubic feet per minute per 1,000 Btu/h

According to the International Mechanical Code, all refrigerating piping, fittings, suction line, etc., during normal operation, will reach a surface temperature below the dew point of the surrounding air, and are located in spaces or areas where it could cause a safety hazard. Therefore insulation is used to ____.

prevent condensation in these spaces and areas

reduce the amount of vibration and noise of the system

decrease the superheat of the system

increase the superheat of the system

The main function of an electric defrost termination thermostat is to

setr the amount of defrost time

How is a fan motor connected electrically to the compressor (for an outdoor fan motor)?

In parallel and controlled by thermostat.

In parallel and controlled by refrigerant control.

In series and controlled by refrigerant control.

In series and controlled by thermostat.

HVAC FC 06

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Professional Development

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70 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which instrument measures pressure above or below atmospheric pressure?

compound gauge

pressure gauge

barometer

psychrometer

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Assume that a gas-fired appliance is located in a garage. Burners of such appliance must be at a distance above the garage floor AT LEAST ____.

There is no minimum clearance

18 inches

12 inches

6 inches

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

According to Ohm's Law, the correct units for electrical current are

Ohms.

Watts.

Volts.

Amperes.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Where should the air conditioning system thermostat be located?

near a door or window

near an air duct

where there is a wide range in temperature

where average temperature conditions exist

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can the head pressure in an air-cooled condenser be determined?

by taking the operational pressure

by subtracting the condenser temperature from the room temperature

by subtracting 25 degrees F (13 degrees C) from the present condenser temperature

by adding 30 degrees to 35 degrees F (17 degrees C to 19 degrees C) to the desired condenser temperature

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What pressure is R-134a at 40 degrees F?

30 psig

35 psig

40 psig

45 psig

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Locking refrigerant service access ports are REQUIRED on

class B refrigerants

class A3 refrigerants

all access ports

only ports located outdoors

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HVAC FC 06

Which instrument measures pressure above or below atmospheric pressure?

Assume that a gas-fired appliance is located in a garage. Burners of such appliance must be at a distance above the garage floor AT LEAST ____.

According to Ohm's Law, the correct units for electrical current are

Where should the air conditioning system thermostat be located?

How can the head pressure in an air-cooled condenser be determined?

What pressure is R-134a at 40 degrees F?

Locking refrigerant service access ports are REQUIRED on

Industrial air heaters: the installation shall include adequate provision to permit direct-fired industrial air heater to operate at rated capacity by taking into account the structure's designed infiltration rate, providing properly designed ____ or an interlocked power exhaust system.

Heat of fusion of water, is the heat released from a substance to change irt from a liquid state to a solid state. The heat of fusion of ice is ___ Btu per pound.

The operating temperature for grease hood fire dampers shall NOT be more than ___ where located in a smoke control system.

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