Question 1

Which of the following instruments is most useful for tracking long-term boiler performance?

Options :

A : The pressure gauge

B : The exhaust stack temperature sensor

C : The boiler room ambient temperature sensor

D : The drum water level gauge

E : The feedwater temperature sensor

Answer: B

Question 2

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 3

Which pump system listed below is most likely the best application for converting to variable-speed drive?

Options :

A : Pump system with parallel rotary lobe pumps in a rebar quenching application with a static head of 80m

B : Pump system with on-off control transferring liquid vertically from a low tank to a higher tank

C : Pump system with bypass control transferring liquid from an intake dam to a process in production

D : Pump system with throttle fully open circulating liquid in a closed loop cooling system

Answer: D

Question 4

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 5

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

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