28701. Austempering of steel requires.it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to
28702. A compact estimate about the amount of materials handling between various work stations is obtained from the
28703. Lead is poured into the joint between two- __________ pipes.
28704. The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6 )
28705. Age hardening is connected with
28706. With decrease in the grain size of a material, its creep resistance
28707. __________ rubber is generally used for making 'O' rings used for vacuum sealings.
28708. Gross national product (GNP) means the total value of __________ in a country.
28709. Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.
28710. The co-ordination number in simple cubic structure is
28711. Out of the following surfaces, the emis-sivity will be minimum for
28712. The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the
28713. The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.
28714. __________ the exhaust gas is an indication of the incomplete combustion of fuel.
28715. Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be
28716. Frost formation on the evaporator tubes in the domestic refrigerators
28717. Function of feed check valve in a boiler is to
28718. Ganister contains maximum percentage of
28719. Nitrogen is not an essential component of
28720. In inventory control theory, the economic order quantity (EOQ) is the
28721. The main charge in blast furnace is usually
28722. The atmospheric temperature during melting of ice/snow (in the atmosphere)
28723. At room temperature, F.C.C. crystal structure is observed in
28724. The basic function of the drum in a boiler is to
28725. In the preparation of ammonia which is used as drying agent
28726. Colloids can be purified by
28727. The most prominent single cause of corrosion in boilertubes, drums, economisers and steam superheaters in a thermal power plant boiler is the
28728. Maximum carbon content in cast iron is __________ percent.
28729. Screws are specified by their __________ diameters.
28730. The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the __________ point of the material.
28731. A material being tested for endurance strength is subjected to the __________ load.
28732. With increase in pressure, the latent heat of steam
28733. 'Flare tower' used in industry is meant for
28734. Which of the following has the highest modulus of elasticity (about 7 x 106 kg/cm2) ?
28735. Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to
28736. All radiations falling on a black body are
28737. Styrofoam is the commercial name of
28738. Ceramic materials are
28739. Dryness fraction of dry steam is
28740. Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?
28741. Heat required to raise the temperature of a body by 1 °C is called its
28742. Coating of zinc over steel is known as
28743. Air-petrol ratio in an automotive petrol engine is around
28744. The property of material, by which a given amount of energy is absorbed by it, without plastic deformation is called
28745. Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode
28746. Electrochemical corrosion can occur, only if __________ is present in contact with metal.
28747. Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding
28748. Preheating prior to welding is done for the purpose of
28749. Presence of sulphur in steel reduces the
28750. Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?
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