Minimum thermal efficiency of a steam boiler may be around __________ percent

A. 25

B. 45

C. 65

D. 20

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  1. In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________…
  2. Which of the following is an example of stress corrosion?
  3. Preheating before welding is done to
  4. A dummy activity is used in PERT network to describe the
  5. Which of the following metals reacts violently with water?
  6. Adhesives
  7. Uniform ramming of sand in green sand moulding process leads to
  8. Lead is added to 60:40 brass primarily to improve
  9. __________ is not a heat treatment process.
  10. Silicon in steel
  11. Ammonia gas can be dried by
  12. Pipelines carrying various utilities in chemical industries are identified by their colour codes. The…
  13. Glass reacts with
  14. Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
  15. Drossing is a __________ operation.
  16. __________ test determines the yield strength, Young's modulus of elasticity, percentage reduction in…
  17. Encyclopaedia of Chemical Technology has been
  18. The most important requirement for aluminium industry is the availability of cheap
  19. A spring material should have low
  20. Nickel is a __________ material.
  21. Laser welding is widely employed in the __________ industries.
  22. The starting of a car takes time in winter, because the
  23. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other…
  24. Air-petrol ratio in an automotive petrol engine is around
  25. Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative…
  26. __________ remains constant during the adiabatic cooling of moist air.
  27. Which of the following commonly used condenser tube materials has the lowest thermal conductivity?
  28. Tesla metre per ampere (T. m/A) is the unit for the measurement of
  29. Materials having __________ lattice structure are usually the most ductile.
  30. Transformation range for ferrous material is the temperature interval during which __________ is formed…