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Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to

A. Sorbite

B. Bainite

C. Martensite

D. Troostite

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  1. Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C…
  2. There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.
  3. Addition of __________ to steel does not impart hardness.
  4. Fatigue resistance of a material is measured by the
  5. Which of the following is an unconventional source of energy?
  6. The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature…
  7. The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters…
  8. Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same…
  9. LVDT used for displacement measurement is a/an __________ transducer.
  10. Hot extrusion process is not used for making
  11. Heat transfer by __________ is almost absent in case of fluidised bed drying operation.
  12. Stellite is a __________ material.
  13. __________ property of steel increases by addition of large amount of silicon in it.
  14. Speisses is a mixture of the following:
  15. Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the
  16. Wrought iron is never shaped by
  17. Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when…
  18. Quartz is a __________ material.
  19. For dynamic strain measurement, the Wheatstone bridge used is of __________ type.
  20. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold…
  21. In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The…
  22. Corona discharge is related to the operation of a/an
  23. Oxygen cylinders used for autogenous (cutting/welding) purposes are
  24. Leakage in a cooking gas cylinder is detected by
  25. Which of the following forces does not act on a fluid at rest?
  26. at 1173E; at equilibrium, what will be the number of moles of CO gas required to reduce one mole of…
  27. Absolute zero pressure can be attained at a temperature of
  28. Ammonia gas can be dried by
  29. Hot working of lead is carried out at
  30. The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.