If an under floor space is supplied with warm air from a furnace, what type of controller system is generally used?

Thermostatic blower control set to 140 deg. F

An adjustable control set at 165 deg F.

A circulating fan control which starts at no higher than 150 deg. F

A furnace cut off switch with an automatic controller that is set to 120 Deg. F

The refrigerant of a mechanical refrigerating system is conveyed by soft annealed copper tubing. When can the tubing be enclosed without visual inspection by the building official?

when no fittings or joints are concealed

when pressures do not exceed 300 psi.

when all joints have mechanical fittings

In minor repairs of mechanical equipment, defective parts shall be replaced or repaired such that they will ___.

preserve the original approval or the listing

allow the equipment to be resold

preserve the efficiency of the equipment

allow the equipment to operate like new

Explain how to prepare duct linings where an electric duct heater is at. These linings need to be:

cut back 6 inches upstream and downstream

A cooling system with a sewer vent concluding at 18 inches above the intake shall have MINIMUM horizontal distance between the sewer vent and fresh air intake of ____ feet.

no minimum distance is required

In many condensing unit applications, it is necessary to heat the compressor to evaporate liquid refrigerant trapped in the oil. Most large compressors for commercial applications are manufactured and equipped to handle this situation using a ___.

low temperature heating circuit

high temperature cooling circuit

Tags were placed to identify equipment on which some work is being done. Also, this equipment must not be operated until further notice. According to OSHA, the tags shall be attached to:

all points where the equipment can be energized

the place where the equipment is being worked on

the point where the main source of energy is connected

all places where the equipment touches the ground

All of the following statements are true regarding causes of high noise while servicing a commercial unit, WITH THE EXCEPTION OF:

a squeaky bearing in the electric motor

the compressor pumping excess oil

The measurement of efficiency for furnaces is the ___.

annual fuel utilization efficiency

heat transfer coefficient rating

seasonal energy efficiency rating

Condensate shall not discharge into a street, alley or other areas so as to cause a nuisance. However, shall be conveyed from the drain pan outlet to an approved place of disposal such as:

sanitary sewer drain, storm sewer drain or approved french drain

roof drain systems that discharges into open space

The minimum size for an access openings for fire dampers shall be___.

adequate to permit maintenance and resetting of the damper

the same as the dimension of the duct

one half the diagonal of the duct

HVAC FC 05

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is required for a rated safety relief valve installed on a hot water heating or supply boiler?

it must be the designated minimum size and pressure rating

it must be the designated maximum size and pressure rating

it must relieve pressure at no more than 125% of the maximum allowable operating pressure of the boiler

it must be set to relieve at or within 6% of the maximum allowable working pressure of the boiler

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the maximum percentage of refrigerant cylinders should be filled/ (liquid volume)

50 percent

60 percent

70 percent

80 percent

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Materials within plenums shall be noncombustible or shall have a smoke-developed index of NOT MORE THAN ____ when tested in accordance with ASTME E 84.

450

250

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Decide which of the following statements are TRUE about the installation of vertical lifelines, independent support lines, and suspension ropes:

must be attached to the same point on the scaffold

must be attached independently of the scaffold

must be attached to each other

must use the same point of anchorage

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What determines air pressure at the Earth's surface?

altitude

humidity in the atmosphere

weight of the air above the earth

current weather conditions

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Items such as ___ use Desiccants to get the job done.

gauge glasses if combined with moisture indicators

strainers

driers

moisture indicators

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Appliances located in public garages, for example a suspended duct heater, shall be installed a MINIMUM of _____ feet above the floor.

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HVAC FC 05

What is required for a rated safety relief valve installed on a hot water heating or supply boiler?

What is the maximum percentage of refrigerant cylinders should be filled/ (liquid volume)

Materials within plenums shall be noncombustible or shall have a smoke-developed index of NOT MORE THAN ____ when tested in accordance with ASTME E 84.

Decide which of the following statements are TRUE about the installation of vertical lifelines, independent support lines, and suspension ropes:

What determines air pressure at the Earth's surface?

Items such as ___ use Desiccants to get the job done.

Appliances located in public garages, for example a suspended duct heater, shall be installed a MINIMUM of _____ feet above the floor.

The heat absorbing ability of a refrigeration unit is 2,880,000 Btus per 24 hours. What is its to rating?

An outside-air inlet serving a nonresidential portion of a building may be covered with screen the size of the openings in this screen mesh must be greater than what size?

What is the dry bulb temperature line range on a normal, medium range psychrometric chart?

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