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Dhariwal Infrastructure

4.3
based on 31 Reviews
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2020Spaces Interview Questions and Answers

Updated 5 Feb 2024

Q1. At what temperature coal is fired in the boiler? What are the parameters to be looked into before firing the coal in the boiler?

Ans.

Coal is fired in the boiler at a temperature of around 350-400 degrees Celsius. Parameters to be looked into include coal quality, moisture content, and particle size.

  • Coal is typically fired in the boiler at a temperature of around 350-400 degrees Celsius

  • Parameters to be looked into before firing coal include coal quality, moisture content, and particle size

  • Coal quality can affect the efficiency of the boiler and the emissions produced

  • Moisture content can affect the calorific...read more

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Q2. What are the Water quality parameters required before filling a boiler? What is the steam quality you maintained in the boiler?

Ans.

Water quality parameters and steam quality are crucial for filling a boiler.

  • Water quality parameters include pH, dissolved oxygen, total dissolved solids, and alkalinity.

  • Steam quality is measured by the percentage of moisture in the steam.

  • Maintaining steam quality is important for efficient operation and preventing damage to the boiler.

  • Steam quality can be improved by ensuring proper water treatment and regular maintenance.

  • Industry standards recommend a steam quality of at le...read more

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Q3. Suppose there is a steam leak in the gauge glass flange joint, how would you handle it?

Ans.

I would immediately isolate the steam supply and release the pressure from the gauge glass flange joint.

  • Isolate the steam supply to prevent further leakage

  • Release the pressure from the gauge glass flange joint

  • Notify the maintenance team to repair the leak

  • Ensure safety measures are followed during the repair process

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Q4. What is supercritical boiler and how it is different from Sub critical Boiler?

Ans.

Supercritical boilers operate at a higher temperature and pressure than subcritical boilers, resulting in higher efficiency.

  • Supercritical boilers use water above its critical point, where there is no distinction between liquid and gas phases

  • Subcritical boilers operate below the critical point of water

  • Supercritical boilers have higher thermal efficiency and require less fuel to produce the same amount of energy

  • Supercritical boilers are more expensive to build and maintain than...read more

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Q5. 2. What is Heat Rate and how it is related to Efficiency?

Ans.

Heat rate is the amount of fuel energy required to produce a unit of electricity. It is inversely related to efficiency.

  • Heat rate is a measure of the efficiency of a power plant.

  • It is calculated by dividing the energy content of the fuel by the amount of electricity generated.

  • A lower heat rate indicates a more efficient power plant.

  • Heat rate is affected by factors such as the type of fuel used, the age of the plant, and the operating conditions.

  • Improving heat rate can lead to...read more

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Q6. 1. What is the Calorific value of coal that is used in my previous plant?

Ans.

I'm sorry, I don't have that information.

  • No data available on the calorific value of coal used in the previous plant.

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