15701. Thermal shock produced by cooling is more dengerous/deleterious than that produced by heating a surface, because of the reason that
15702. The hardness of a grinding wheel is specified by the
15703. Scaling occurs in boiler tubes due to the fact that, the solubility of Ca(OH)2 __________ with increasing temperature.
15704. While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to __________ x Tm (where, Tm Melting temperature).
15705. The factor of safety for brittle materials (having elongation < 5%) is based on the __________ stress.
15706. Carburettor in a spark ignition engine is used to
15707. __________ are not emitted by radioactive substances.
15708. A good abrasive
15709. Out of the following, __________ pipe is the least corrosion resistant.
15710. In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.
15711. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ?
15712. Sheardising process is used for
15713. The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is
15714. Which of the following is an inedible oil ?
15717. In case of fluid moving machineries, the relationship between saturation temperature and pressure decides the process of
15718. Yield strength of a material is determined by the __________ test.
15719. In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are.
15720. Window panes of aeroplanes are normally made of
15721. __________ flux is used for the extraction of metal from its self fluxing ores.
15722. Good design of the casing of a centrifugal pump aims at minimising the
15723. A dummy activity is used in PERT network to describe the
15724. Which of the following is not a characteristic observed in material failure by fatigue fracture ?
15725. A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.
15726. Current employed in resistance welding ranges from __________ kVA/cm2 .
15727. Which hormone is called pregnancy hormone?
15728. Fibrous fracture is normally encountered in the __________ materials.
15729. Bad odour in sanitary latrines is reduced by periodically sprinkling
15730. __________ has the highest melting point out of the following.
15731. The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?
15732. Annealing of cast iron
15733. Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m2 of steel strip.
15734. Chlorine acts as a bleaching agent only in the presence of
15735. Corona discharge is related to the operation of a/an
15736. Plastics as a material of construction suffer from the drawback of low
15737. Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is
15738. Factor of safety is the ratio of the __________ stress to the working stress.
15739. The majority charge carriers in p-type silicon are
15740. Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same
15741. With increase in __________ Knocking tendency in a spark ignition petrol engine decreases.
15742. Between 230 and 370°C, blue brittleness is caused in mild steel because of the
15743. Every proposal for amendment of bye-laws shall be made only by a resolution passed by what majority of members Present and voting?
15744. Which of the following is not a dielectric material ?
15745. Magnetic permeability of iron is increased by its
15746. The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as
15747. Which section of KCS Act deals with cancellation of Registration certificate?
15748. Boiling point of water gets lowered at high altitudes (e.g., hills), because
15749. With increase in temperature, the electrical conductivity of semiconductors
15750. Which of the, following is not associated with the functioning of a petrol engine ?