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Thermal efficiency of well maintained boiler will be of the order

A. 40 %

B. 50 %

C. 75 %

D. 90 %

Correct Answer : D.


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  1. The ratio of the workdone on the blades to the energy supplied to the blades, is called
  2. If the critical pressure ratio for steam is 0.546, then the steam is initially
  3. Steam exhaust from high pressure turbine is reheated in
  4. Which of the following statement is wrong?
  5. Which of the following statement is correct?
  6. The discharge is __________ at critical pressure.
  7. The working pressure range for a LaMont boiler is
  8. A device used to heat feed water by utilising the heat in me exhaust flue gases before leaving through…
  9. Heating of dry steam above saturation temperature is known as
  10. Rateau turbine is
  11. Steam turbines are used for
  12. The actual power generated in the engine cylinder is called
  13. Ultimate analysis of fuel is determination of percentage of
  14. An economiser in a boiler
  15. The object of producing draught in a boiler is
  16. The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is
  17. Feed water conditioning in thermal power plants in done to
  18. The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or…
  19. The rate of steam produced in Benson boiler is
  20. A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine…
  21. Vacuum for reciprocating steam engines compared to steam turbines is
  22. Cut-off ratio is the ratio of
  23. A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water…
  24. In a reaction turbine, when steam flows through the moving blades,
  25. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined…
  26. The behaviour of coal in a furnace is determined by
  27. A stage, in reaction turbine, is represented by
  28. The expansion of steam in a nozzle follows
  29. The best suited coal for chain or travelling grate stoker boiler is
  30. Efficiency of a thermal cycle increases by