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Power plant operator interview questions and answers pdf

 Q 1. What are the difference between convective superheaters and radiant superheaters?

Ans. Convective superheaters receive heat from flue gases. Radiant superheaters are placed in the furnace. The wall tubes of radiant superheater receive heat from the burning fuel through radiant process. Radiant superheaters are usually used where the steam is to be raised to a high superheat temperature.

Q 2. What is the function of a steam separator?

Ans. The function of a steam separator is to reduce the wetness of the steam by removing the water particles from the steam before it enters the steam turbine or engine. It is installed on the main pipe delivering the steam as close as possible to the engine.

Q 3. Types of steam separator?

Ans. On the basis of principle of operation steam separators are classified into baffle or impact type, reverse current type and centrifugal type. There is a loss of heat in the steam pipe after the steam leaves the boiler which produces wetness. This wetness could damage the turbine or engine. Steam separator is installed close to the engine to remove the water particles and reduce the wetness of the steam.

Q 4. What is the function of a steam trap?

Ans. Steam trap captures the condensed steam from the steam pipes, steam jackets and steam separators. It doesn’t allow steam to escape. Removal of condensed steam is important because wetness could damage the engine or turbine.

Q 5. Types of air preheater used in boiler?

Ans. There are three types of air preheater – tubular type, storage type and plate type. There is no such category as temperature type. In tubular type air preheaters, the hot gases after leaving the boiler travel through inside of the tubes in a direction opposite to that of air and transfer some part of their heat to the air. In case of plate type air preheaters, the air absorbs the heat from the flue gases rushing through the heater at high velocity on the opposite side of the plate

Q 6. The degree of preheating does depend on?

Ans. The degree of preheating doesn’t depend on initial temperature of air. It depends on type of fuel, type of fuel burning equipment and ratings at which boiler and furnace are operated. An air preheater increases the temperature of the air being supplied to the furnace for better combustion.

Q 7. Which type air preheaters are widely used in larger plants?

Ans. Storage type air preheaters are widely used in larger plants. An air preheater increases the temperature of the air being supplied to the furnace. It smoothens the burning of fuel and helps in combustion process.

Q 8. What is the function of a superheater?

Ans. The function of a superheater is to increase the temperature of steam leaving the boiler above saturation temperature. Economiser increases the temperature of the feed water being supplied to the boiler. Air preheater increases the temperature of the air being supplied to the furnace.

Q 9. Is superheater reduces the steam consumption?

Ans. Superheater reduces the steam consumption of the engine or turbine. It eliminates turbine erosion. It also reduces the losses due to condensation in the steam pipes and cylinders. Superheater being a boiler accessory increases the efficiency of the steam plant.

Q 10. Where the convective superheater is located?

Ans. Convective superheaters utilize the heat from flue gases so it is located in second pass. It is radiant superheater that is located in the furnace and it absorbs heat from the burning fuel through radiant process. Radiant superheaters are generally used when a high superheat temperature is required

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