HVAC FC 05

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

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

• 50 percent
• 60 percent
• 70 percent
• 80 percent

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
• 50
• 25

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

What determines air pressure at the Earth's surface?

• altitude
• humidity in the atmosphere
• weight of the air above the earth
• current weather conditions

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

• gauge glasses if combined with moisture indicators
• strainers
• driers
• moisture indicators

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

• 10
• 6
• 7
• 8

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

• 5.0 tons
• 7.5 tons
• 10.0 tons
• 15.0 tons

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?

• 1/8 inch
• 1/4 inch
• 1/2 inch
• 3/4 inch

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

• 20 degrees F to 107 degrees F
• 0 degrees F to 212 degrees F
• 0 degrees C to 100 degrees C
• 20 degrees C to 107 degrees C