Building Engineering HVAC and Building Mechanical Systems 1

Question 1

What does ASHRAE Standard 62.1 govern in building design?

Accepted Answer

Ventilation for acceptable indoor air quality

Answer

Thermal comfort in occupied spaces

Answer

Energy efficiency of HVAC systems

Answer

Refrigerant management and recovery

Question 2

What refrigerant is widely used in commercial HVAC systems as a replacement for R-22?

Accepted Answer

R-410A

Answer

R-11

Answer

R-12

Answer

R-502

Question 3

What is the primary function of a Variable Air Volume (VAV) box in an HVAC system?

Accepted Answer

To modulate the volume of conditioned air delivered to a zone

Answer

To vary the refrigerant flow to air handlers

Answer

To control chiller capacity

Answer

To regulate boiler output

Question 4

Which heat transfer fluid is commonly circulated through chilled water HVAC systems?

Accepted Answer

Chilled water at 40–45°F

Answer

Refrigerant R-410A

Answer

Steam at 15 psig

Answer

Hot water at 180°F

Question 5

What is the purpose of an economizer in an HVAC air handling unit?

Accepted Answer

To use outdoor air for free cooling when conditions are favorable

Answer

To recover heat from exhaust air

Answer

To reduce refrigerant charge

Answer

To pre-heat supply air in winter

Question 6

What unit is used to measure the cooling capacity of HVAC equipment?

Accepted Answer

Ton of refrigeration

Answer

BTU per hour only

Answer

Kilowatt thermal

Answer

Watt per square foot