Question 1

In a warehouse, lights are mounted 4 meters above the floor. This provides an average light level of 150 lux. To increase the light level without installing more lights or higher Wattage lights, you lower the light fixtures with pendants so that the lights are located 3.25 meters above the floor. Calculate the new average light level on the floor.

Options :

A : 150 lux

B : 166 lux

C : 176 lux

D : 227 lux

E : 276 lux

Answer: C

Question 2

A new lighting system costs $60,000. The new lighting system has a 15-year life and the minimum required rate of return (MARR) is 15%. How much must the new lighting system save to be life-cycle cost effective?

Options :

A : $10,260/year

B : $12,556/year

C : $15,650/year

D : $27,090/year

E : $33,200/year

Answer: B

Question 3

What term describes the difference between the control signal value and the set point?

Options :

A : Differential

B : Dead band

C : Error or offset

D : Cut off

E : Dead time

Answer: C

Question 4

How does an enthalpy-based economizer control operate?

Options :

A : Using a constant mixed air proportion control sequence

B : Comparing the difference in dry-bulb air temperature measurements of the return air and the outdoor air

C : Measuring the outdoor air dry-bulb temperature and relative humidity

D : Using the dry-bulb temperature and relative humidity of both the outdoor-air and return-air

Answer: D

Question 5

A high-pressure steam system passes 180°C condensate (saturated liquid) through a steam trap to an atmospherically vented condensate receiver tank. If the steam trap is working properly, how much of the condensate mass can be lost out the vent of the receiver tank in the form of flash steam?

Options :

A : 6%

B : 15%

C : 25%

D : 66%

E : 100%

Answer: C