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BFDC Mechanical Job Written Question & Answer-2019 {HD}!!

BFDC Mechanical Job Written Question & Answer-2019 {HD}!!


Question Number 1: How many Laws of Thermodynamics are there?
Answer: There are three laws of the thermodynamics.
First Law: Energy can be neither created nor destroyed. It can only change forms. In any process in an isolated system, the total energy remains the same.
Second Law: When two isolated systems in separate but nearby regions of space, each in thermodynamic equilibrium in itself, but not in equilibrium with each other at first, are at some time allowed to interact, breaking the isolation that separates the two systems, and they exchange matter or energy, they will eventually reach a mutual thermodynamic equilibrium.
Third Law: As temperature approaches absolute zero, the entropy of a system approaches a minimum.

Question Number 2: What is the function of a Boiler? Briefly explain the Boiler mounting, and name its classifications?
Answer: A Boiler supplies dry and saturated steam at the required pressure.
A particular apparatus or equipment is placed on the boiler to improve its safety, maintenance convenience and steam supply, is known as Boiler mounting. Following are the different Boiler mountings,
  • Water level
  • Supply valves
  • Pressure gauge
  • Stop valve
  • Feed check valve
  • Blow off cock
  • Fusible plugs etc
Question Number 3: What are boiler accessories? Explain each accessories in detail?
Answer:
Boiler accessories are devices which are not compulsory to be attached to it but if we use them it increases efficiency and overall performance.
Some accessories are listed below:-
·         Feed water pump
·         Pre-heater
·         Super-heater
·         Economizer
Question Number 4: What is surface tension?
Answer:
Surface tension is measured as the energy required increasing the surface area of a liquid by a unit of area. The surface tension of a liquid results from an imbalance of inter molecular attractive forces, the cohesive forces between molecules.

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