BOC Energy Conservation Techniques 5

Question 1

A motor operating at 40% of its rated load is likely to have:

Accepted Answer

Reduced efficiency and lower power factor

Answer

Lightly loaded motors run below peak efficiency and have a poor power factor, which makes them candidates for right-sizing.

Question 2

Which method best reduces simultaneous heating and cooling in a building?

Accepted Answer

Widen the deadband between heating and cooling setpoints

Answer

A wider deadband keeps heating and cooling from fighting each other in the same space.

Question 3

Static pressure reset on a VAV supply fan typically uses which input to lower the duct pressure setpoint?

Accepted Answer

Terminal unit damper positions

Answer

Trim-and-respond logic lowers static pressure until the most-open VAV damper is nearly fully open, which saves fan energy.

Question 4

Insulating bare hot water and steam piping in a mechanical room primarily saves energy by:

Accepted Answer

Reducing radiant and convective heat loss to the surroundings

Answer

Insulation cuts heat loss from hot surfaces, which reduces the fuel needed to keep fluid temperatures up.

Question 5

Which retrofit typically gives the greatest lighting energy reduction in a warehouse with high-intensity discharge fixtures?

Accepted Answer

LED high-bay fixtures with occupancy controls

Answer

LED high-bays use far fewer watts than HID and can instantly dim or switch off with occupancy sensors.

BOC - Building Operator Certification Practice Test