Exam Questions And Correct Answers

Ohio Power Plant Operator Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

1. The primary function of a boiler in a power plant is to:

• Generate mechanical energy
• Convert water into steam
• Store feedwater
• Remove impurities from water

Rationale: Boilers use heat energy to convert water into steam for power

generation.

2. The device that maintains steam pressure within safe limits is a:

• Thermostat
• Damper
• Safety valve 1 / 4

• Check valve

Rationale: The safety valve releases excess pressure to prevent boiler

explosions.

• Which law states that energy cannot be created or destroyed?
• Newton’s First Law
• Charles’ Law
• First Law of Thermodynamics
• Boyle’s Law

Rationale: The First Law of Thermodynamics states that energy can only

change forms, not be created or destroyed.

4. The feedwater pump is used to:

• Circulate cooling water
• Deliver water to the boiler
• Remove condensate
• Pump fuel

Rationale: Feedwater pumps supply water to the boiler under pressure for

steam generation.

5. Superheated steam is produced by:

• Evaporating water in the boiler 2 / 4

• Heating saturated steam further without increasing pressure
• Adding more water to the boiler
• Lowering the steam temperature

Rationale: Superheating raises steam temperature above saturation point

without changing pressure.

6. The main purpose of a condenser in a steam plant is to:

• Increase steam pressure
• Convert exhaust steam into water
• Heat the feedwater
• Filter impurities

Rationale: Condensers convert exhaust steam back into water for reuse,

improving efficiency.

7. The unit of electrical power is the:

• Volt
• Watt
• Ampere
• Ohm

Rationale: Power is measured in watts, which equals volts multiplied by

amperes.

• / 4

• What is the main purpose of water treatment in a boiler system?
• Cool the feedwater
• Prevent scale and corrosion
• Increase pressure
• Improve combustion

Rationale: Proper treatment prevents deposits and corrosion that reduce

boiler efficiency and life.

9. A device that measures pressure is called a:

• Manometer
• Calorimeter
• Thermocouple
• Flowmeter

Rationale: A manometer measures pressure differences using a fluid

column or gauge system.

10. The Rankine cycle is used to describe the operation of a:

• Gas turbine
• Steam power plant
• Diesel engine
• Nuclear reactor

Rationale: The Rankine cycle models the thermodynamic process of

converting heat into mechanical work using steam.

• / 4