Plant Operator Selection System Test POSS 4

Question 1

A boiler produces 15,000 lbs of steam per hour. If efficiency drops by 10%, how many lbs of steam per hour will it produce?

Accepted Answer

13,500 lbs/hr

Answer

15,000 × (1 − 0.10) = 15,000 × 0.90 = 13,500 lbs of steam per hour.

Question 2

Which instrument would a plant operator use to measure electrical current in a circuit without interrupting it?

Accepted Answer

Clamp-on ammeter

Answer

A clamp-on ammeter measures current magnetically around a conductor without breaking the circuit.

Question 3

A passage describes a water treatment process: coagulation occurs first, then sedimentation, then filtration, then disinfection. What is the third step?

Accepted Answer

Filtration

Answer

The passage lists four steps in order; filtration is explicitly the third step after sedimentation.

Question 4

A line graph shows plant output (MW) over 24 hours. Output peaks at 480 MW at 2 PM and reaches its low of 210 MW at 3 AM. What is the range?

Accepted Answer

270 MW

Answer

Range = maximum − minimum = 480 − 210 = 270 MW.

Question 5

A reciprocating pump completes 60 strokes per minute. Each stroke displaces 0.5 gallons. What is the flow rate in gallons per hour?

Accepted Answer

3,000 gal/hr

Answer

60 strokes/min × 0.5 gal/stroke = 30 gal/min; 30 × 60 min = 1,800 gal/hr.

Plant Operator Selection System Test Practice Test

Plant Operator Selection System Test Practice Test

Plant Operator Selection System Test POSS 4