1. Which type of steam generator is characterized by its operation above the critical pressure of water?
a) Conventional boiler
b) High-pressure boiler
c) Lamont boiler
d) Velox boiler
Answer: b) High-pressure boiler
Explanation: High-pressure boilers operate above the critical pressure of water, typically above 221 bar. This allows for greater energy efficiency and performance compared to conventional boilers.
2. The Benson boiler is known for its:
a) Low water consumption
b) Complex design
c) Use of natural circulation
d) Slow steam production
Answer: a) Low water consumption
Explanation: The Benson boiler is renowned for its low water consumption due to its once-through steam generation process, where water is converted to steam in a single pass through the boiler tubes, resulting in high efficiency and reduced water usage.
3. Which steam generator utilizes a closed-loop cycle with no direct contact between steam and water?
a) Loeffler boiler
b) Velox boiler
c) Lamont boiler
d) Benson boiler
Answer: a) Loeffler boiler
Explanation: The Loeffler boiler operates on the principle of a closed-loop cycle, where steam is generated by mixing feedwater with superheated steam outside the boiler drum. This design prevents direct contact between steam and water.
4. The efficiency of a boiler is calculated by:
a) Energy input/output ratio
b) Steam pressure
c) Steam temperature
d) Fuel consumption
Answer: a) Energy input/output ratio
Explanation: Boiler efficiency is determined by the ratio of energy output (steam production) to energy input (fuel consumption), typically expressed as a percentage.
5. Super critical boilers operate at pressures:
a) Below atmospheric pressure
b) Above critical pressure of water
c) Below 100 bar
d) Equal to atmospheric pressure
Answer: b) Above critical pressure of water
Explanation: Super critical boilers operate above the critical pressure of water, typically above 221 bar, resulting in enhanced efficiency and performance.
6. Boiler draught is used to:
a) Control steam temperature
b) Control combustion airflow
c) Increase water level in the boiler
d) Decrease boiler pressure
Answer: b) Control combustion airflow
Explanation: Boiler draught, achieved through natural or forced means, regulates the airflow into the combustion chamber, ensuring optimal combustion conditions for efficient fuel utilization.
7. Which boiler code provides guidelines for the design, construction, and inspection of power boilers?
a) ASME Boiler and Pressure Vessel Code
b) ISO 9001
c) European Pressure Equipment Directive (PED)
d) ASTM Standards
Answer: a) ASME Boiler and Pressure Vessel Code
Explanation: The ASME Boiler and Pressure Vessel Code sets standards for the design, construction, and inspection of power boilers, ensuring safety and quality in boiler manufacturing and operation.
8. Equivalent evaporation of a boiler is a measure of its:
a) Steam pressure
b) Steam temperature
c) Steam quality
d) Steam output compared to the evaporation of water
Answer: d) Steam output compared to the evaporation of water
Explanation: Equivalent evaporation represents the amount of steam produced by a boiler per unit mass of fuel burned, compared to the evaporation of water under standard conditions.
9. Which type of boiler is known for its rapid steam production and compact design?
a) Lamont boiler
b) Velox boiler
c) Benson boiler
d) Loeffler boiler
Answer: b) Velox boiler
Explanation: The Velox boiler is recognized for its rapid steam generation and compact design, achieved through a combination of forced circulation and combustion processes.
10. Fuel and ash handling in boilers primarily involves:
a) Monitoring steam pressure
b) Storing fuel in the combustion chamber
c) Transportation and storage of fuel and ash
d) Controlling boiler temperature
Answer: c) Transportation and storage of fuel and ash
Explanation: Fuel and ash handling in boilers encompasses the processes of transporting, storing, and managing fuel (such as coal or biomass) for combustion, as well as handling and disposing of resulting ash residues.