The main charge in blast furnace is usually

A. Iron ore & coke

B. Iron ore, coke & air

C. Limestone, coke & iron ore

D. Limestone, sand & iron ore

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  1. In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb…
  2. The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________…
  3. Out of the following __________ iron has the best capability to bear sudden & excessive shocks.
  4. Which of the following has the highest value of refractive index?
  5. For separating small pieces of metal from engine oil of a car, the best separating technique is the
  6. While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to __________…
  7. Superheating of steam is done at constant
  8. With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________…
  9. Presence of nickel & chromium in steel does not raise its
  10. Change in volume of metals from absolute zero temperature to their melting points is
  11. __________ test can be termed as the semidestructive test.
  12. Maximum hardenability of steel depends upon its
  13. The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature…
  14. The unit of gc is
  15. __________ pipe is the most suitable for carrying sanitary drainage.
  16. __________ rubber is generally used for making 'O' rings used for vacuum sealings.
  17. With increase in temperature, the electrical conductivity of semiconductors
  18. Pick out the wrong statement.
  19. While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen…
  20. Super conduction in metals is observed at a temperature of __________ °K.
  21. Oxyacetylene reducing flame is used while carrying out welding on
  22. All of the following alloying elements of steel increases hardness but sacrifice ductility, except
  23. Absolute zero pressure can be attained at a temperature of
  24. Identify the false statement
  25. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean…
  26. Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.
  27. Wrought iron is never shaped by
  28. Nitriding of a steel part does not increase its
  29. For a first order chemical reaction, the concentration of the reactant decreases __________ with time.
  30. Unit of viscosity in CGS system is