29451. Absorptivity of a grey body varies with the
29452. In radiative heat transfer, a grey surface is the one, which has
29453. Overheating of satellites during re-entry to earth is controlled by
29454. The most abundant metal present in the earth's crust is;
29455. Pick out the wrong statement:
29456. The tensile strength of plastics ranges from __________ kg/mm2.
29457. In case of Contributory president Fund,an amount not less than what percent of basic pay of employee is to be deducted as his contribution?
29458. Grain hardness is measured by the __________ hardness testing method.
29459. The thermal efficiency of a heat engine giving an output of 4 KW with an input of 10000 Joules/sec is __________ percent.
29460. Which of the following alloying elements when added in steel does not improve its lachinability ?
29461. Largest application of laser welding is in __________ welding.
29462. Which of the following is a neutral flux used in the pyrometallurgy of metal extraction?
29463. The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm2 .
29464. Value of a material is usually considered as a relationship between
29465. Which of the following is not an ore of zinc?
29466. Pressure gauges are never connected directly to the live steam line; rather a loop or syphon is interposed as close as possible to the pressure gauge. This is done to
29467. Phosphorous is added to copper melt to
29468. Which of the following is not a suitable solid lubricant ?
29469. On an average __________ fast neutrons are produced by nuclear fission of each atom of uranium-235.
29470. Castability of aluminium is increased by the addition of __________ in it.
29471. Addition of __________ to steel can not impart it high strength at elevated temperature.
29472. Hard magnetic materials have high
29473. The difference in the properties of a substance in three states of matter depends upon the
29474. Ignition of fuel in a diesel engine is by
29475. What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.
29476. Which set of materials is used as a moderator in nuclear reactor ?
29477. Malleabilisation heat treatment is performed on
29478. For hardening high alloy steel, it is to be heated slowly and uniformly to avoid
29479. Disposable patterns are made of
29480. The type of water filter normally employed/ preferred for treating small quantities of water in railway stations and individual industries is the __________ filter.
29481. The radioactive isotope of hydrogen is
29482. Refrigerative cooling employed during long distance transportation of food stuffs is normally done by
29483. Internal cracks in drawn bars are due to
29484. Yield strength of a polycrystalline metal with an average grain size, d, is proportional to
29485. A pipeline buried in soil is commonly protected from corrosion by
29486. Circulation of liquid metal (i.e. molten sodium) in a liquid metal cooled nuclear reactor is done by a/an __________ pump.
29487. Titanium is produced by __________ of Ti Cl4.
29488. __________ strain gauge is the most sensitive sensing element for strain measurement.
29489. A simple closed grinding circuit may consist of
29490. In a titration involving weak acid and strong base, the preferred indicator is
29491. Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area ; in the casting)
29492. Every society shall transfer at least this much portion of net profit to Reserve fund
29493. Minimum diameter of the tube used for making water manometer should be __________ mm to avoid a correction for the effect of capillarity.
29494. Which of the following heat treatment processes is used for softening the hardened material ?
29495. During brazing, if the fluxes are entrapped, it results in the
29496. Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm.
29497. All modes of heat transfer i.e., conduction, convection & radiation occur in case of the
29498. The standard instrument used for calibrating the load applied by universal testing machine is called
29499. The reductant used in the extraction of magnesium from calcined dolomite via Pidgeon's process is
29500. With increase in pressure, the saturation temperature of steam
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