Top 10 Power Plant Viva Questions and Answers {Part-1)

Question Number 1: Explain Reheat Cycle?

Answer:

If the dryness fraction of steam leaving the turbine is less than 0.88, then, corrosion and erosion of turbine blades occur. To avoid this situation, reheat is used.

In the reheat cycle, the expansion of steam takes place in one (or) more turbines. Steam is expanded in the HP turbine first, and then it is reheated. The reheated steam is again expanded in. the LP turbine.

Question Number 2: Name Different Methods of Reheating?

Answer:

Ø Gas Reheating.

Ø Live stream reheating.

Ø Combined gas live steam reheated.

Question Number 3: What Are The Important Advantages Of Re Heating?

Answer:

Ø Due to reheating, network done increases.

Ø Heat supply increases.

Ø Thermal efficiency increases.

Ø Due to reheating, the turbine exit dryness fraction increases so moisture decreases so blade erosion becomes minimum so life of the turbine will be increased.

Question Number 4: Explain The Term Regeneration?

Answer:

Regeneration means heating the feed water by steam taken from the turbine. The steam is exhausted (bled) from the turbine at several locations before exhaust and is supplied to regenerative (feed water heater) to heat the feed water.

Question Number 5: State Some Advantages of Regeneration Cycle?

Answer:

Ø Heat supplied to boiler becomes reduced.

Ø Thermal efficiency is increased since the average temperature of heat addition to the cycle is increased.

Ø Due to bleeding in the turbine, erosion of turbine due to moisture is reduced.

Question Number 6: Define The Term Waste Heat Recovery?

Answer:

Waste heat is the heat which is not at all used and exhausted out as a waste product. Waste heat is normally available from the industry in the form of process steam and water at high temperature.

Also, the waste heat is discharged with the exhaust gases in so many industries. This heat can be recovered for useful purpose. This process is known as waste heat recovery.

Question Number 7: What Are The Waste Materials, Which Can Be Used For Fuel For Power Generation?

Answer:

Ø Municipal waste.

Ø Industrial waste.

Ø Paper waste.

Ø Rubber waste.

Question Number 8: Write About Waste Heat Boilers?

Answer:

The waste heat boilers use the waste heat in gases coming out of diesel engines and gas turbines at high temperature (or) use the waste as a fuel in the incineration.

Some boilers use the industrial dirty gases for power generation.

Question Number 9: Define Bleeding In Steam Power Plant?

Answer:

Assume 1 kg of steam is expanded in the turbine. Before complete amount of steam is expanded, some amount of steam (m kg) is extracted, ‘Extracting the steam in the turbine before exhaust is called bleeding. This bled steam is used to heat the feed water.

Question Number 10: Name Different Methods Used To Extract Steam For Heating The Feed Water?

Answer:

Ø Direct contact heater

Ø Drain pump method

Ø All drains to hot well

Ø Cascade system

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