With increase in temperature, the electrical conductivity of semiconductors
Increases
Decreases
Remain constant
Either (A) or (B), depends on the type of semi-conductor
- Between 230 and 370°C, blue brittleness is caused in mild steel because of the
- Pick out the wrong statement.
- Induced draft fans provided in large thermal power plant boilers have __________ blades.
- Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial…
- Speed of a submarine in deep sea & that of an aeroplane is measured by a/an
- Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________…
- Pick out the wrong statement.
- The property of material, by which a given amount of energy is absorbed by it, without plastic deformation,…
- Function of gear box is to
- Particle nature of cathode rays is proved due to the fact that they
- Steel & cast iron pipes are produced by __________ casting.
- Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an…
- Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic…
- __________ test determines the yield strength, Young's modulus of elasticity, percentage reduction in…
- Satellites burn off during re-entry to earth's atmosphere, because of the
- Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.
- The underground well of a biogas plant is called the
- The most important function of a washer is to provide bearing area and washers are normally specified…
- Which of the following is an acidic constituent of B.F. slag?
- The lightest non-inflammable gas is
- In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just…
- __________ is not a heat treatment process.
- Which of the following rays has the least wavelength?
- The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost…
- 'Flare tower' used in industry is meant for
- The same volume of all gases is representative of their
- __________ property of a material is determined by the Herbert Pendulum device.
- Starting friction is low in case of the __________ lubrication.
- Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.
- Which of the following mainly decides the current to be employed is arc welding?