MECH - HVAC & Fire Protection Quiz

Enthalpy is the sum of latent and _ heat.

sensible

_ is the number of BTU's to melt one ton of ice over a 24 hour period.

288,000

_ is the process of introducing fresh air into the building.

Ventilation

_ air is used to replace air that is lost to exhausted air.

Make up

What is the definition of sensible heat?

The heat that can be measured by a thermometer.

What is the definition of BTU?

The amount of heat required to raise one pound of water 1 degree F.

What is the definition of a latent heat?

The heat used to cause a change of state.

Air velocity is expressed in _.

feet per minute

Relative humidity is _ % at the saturation line.

100

What is the definition of specific heat?

The amount of heat required to raise one pound of a substance 1 degree F.

_ is the process of removing particles and contaminants from air.

Filtration

A grain is the unit of measure that equals _ lb.

1/7000

One ton of refrigeration is _.

12,000 BTUh

If 1.5 pounds of water are raised from 40 degrees F to 60 degrees F, how many BTUs are added to the water?

30 BTU

The second law of thermodynamics states that heat always flows from a material at a colder temperature to a material of hotter temperature. True or false?

False.

Temperature stratification occurs when cold air in a building space rises to the ceiling and warm air drops to the floor. True or false?

False

Regardless of the temperature of the air, air moving through a room at a velocity of 60 fpm feels drafty. True or False?

True

Air is being heated across a hot water heat exchanger. The heat exchanger is designed for 35,000 BTUh. If the EAT is 65 degrees F and the LAT is 105 degrees F, what is the CFM?

796

In a hydronic heating system, water flowing at a rate of 10 gpm enters the boiler at 168 degrees F and leaves the boiler at 200 degrees F. How much heat is the boiler putting in the system? Be sure to answer with the value and unit of measure.

160,000 BTUh

Using your Psychrometric Chart, find the Wet-Bulb temperature if given 75 degrees F (DB) and 50%(RH).

80.5

A well planned fire protection system includes 3 concurrent and sequential operations. Name all 3 operations in proper order: _, _, and _.

Detection, signaling, and fire suppression

According to ASHRAE standard 55, a good HVAC design will satisfy what percentage of occupants in the building?

80%