Unbreakable crockeries are made from __________ polymers.
Polystyrene
Melamine
Polystyrene
Polyurethane
- Wavelength of radiation emitted by a body depends on the __________ of its surface.
- Air-petrol ratio for maximum power generation in spark ignition engine is about
- Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.
- The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is…
- __________ is not a heat treatment process.
- Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional…
- During sensible cooling of air, its wet bulb temperature
- The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and…
- Hydrogen can be
- Pick out the wrong statement.
- The main reducing agent in iron blast furnace is
- Pick out the wrong statement.
- A material subjected __________ must have high resilience.
- Limestone addition in the blast furnace is done to flux __________ present in the raw materials.
- Which of the following can be manufactured using powder metallurgy techniques?
- Temper brittleness of a material can be fairly detected by the __________ test.
- Yield strength of a polycrystalline metal with an average grain size d, is proportional to
- Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete…
- The Al2O3 content of cryolite in Hall- Heroult cell is maintained between __________ percent.
- __________ of air does not increase with increase in temperature.
- Thermistors are used in __________ devices.
- The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________…
- Ammonia leakage in the refrigeration system is detected by
- Out of the following the refractive index is the highest for
- The most important requirement for aluminium industry is the availability of cheap
- Drossing is a __________ operation.
- In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________…
- Often earing defects are found during deep drawing operation, because the
- Nitriding of a steel part does not increase its
- Force between the molecules of the same substance is called __________ force.