Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to
Sorbite
Bainite
Martensite
Troostite
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- Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C…
- There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.
- Addition of __________ to steel does not impart hardness.
- Fatigue resistance of a material is measured by the
- Which of the following is an unconventional source of energy?
- The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature…
- The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters…
- Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same…
- LVDT used for displacement measurement is a/an __________ transducer.
- Hot extrusion process is not used for making
- Heat transfer by __________ is almost absent in case of fluidised bed drying operation.
- Stellite is a __________ material.
- __________ property of steel increases by addition of large amount of silicon in it.
- Speisses is a mixture of the following:
- Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the
- Wrought iron is never shaped by
- Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when…
- Quartz is a __________ material.
- For dynamic strain measurement, the Wheatstone bridge used is of __________ type.
- In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold…
- In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The…
- Corona discharge is related to the operation of a/an
- Oxygen cylinders used for autogenous (cutting/welding) purposes are
- Leakage in a cooking gas cylinder is detected by
- Which of the following forces does not act on a fluid at rest?
- at 1173E; at equilibrium, what will be the number of moles of CO gas required to reduce one mole of…
- Absolute zero pressure can be attained at a temperature of
- Ammonia gas can be dried by
- Hot working of lead is carried out at
- The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.