Q.1

Runga-Kutta method is used to solve a/an

  • ordinary differential equation of nth order.
  • simultaneous non-linear equation.
  • linear differential equation.
  • none of these.
Q.2

Pick out the wrong statement.

  • Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly caused by the formation and coalescence of voids in the necked region.
  • Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation.
  • Fatigue fracture of a material is always brittle in nature and takes place due to the existence of line imperfections.
  • Brittle materials are generally tested in tension.
Q.3

Recrystallisation temperature of steel is __________ °C.

  • 50
  • 300
  • 500
  • 800
Q.4

A spring material should have low

  • elastic limit
  • deflection value
  • fatigue resistance
  • none of these
Q.5

Pick out the wrong statement about coating/electroplating of metals.

  • Phosphate coating is used as an excellent base for paints & enamels.
  • Phosphate coating is less corrosion resistant than chromate coating.
  • The base metal to be electroplated is normally made the cathode of the electrolytic cell and coating metal is made the anode.
  • Calorising is the process of coating steel with chromium.
Q.6

More thanof __________ is present in corrundum.

  • SiO2
  • A12O3
  • CaSiO2
  • MgO
Q.7

Pressure required to increase the density of water by aboutis __________ atmosphere.

  • 10
  • 50
  • 200
  • 1000
Q.8

When a tuning fork vibrates, the waves produced in the fork are

  • stationary
  • longitudinal
  • progressive
  • transverse
Q.9

In case of a, centrifugal pump, the ratio h1/h2 is termed as the __________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller).

  • mechanical
  • overall
  • volumetric
  • impeller
Q.10

Blow off cock is provided in steam boiler to

  • guard the boiler in case of abnormal rise in steam pressure.
  • drain out water and sludge during its repair.
  • regulate the supply of water in boiler.
  • put out the fire in the furnace when the water level in the boiler falls to unsafe limit.
Q.11

Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion.

  • annealing
  • toughening
  • work hardening
  • tempering
Q.12

Fatigue limit of a material should not be increased by

  • shot peening
  • surface decarburisation
  • understressing
  • cold working
Q.13

In continuous casting process, graphite moulds are used with a view to providing

  • heat resisting medium.
  • self lubricating qualities.
  • non-wetting surfaces.
  • chilling effect.
Q.14

Thermit welding is categorised as the __________ welding.

  • forge
  • fusion
  • resistance
  • arc
Q.15

Tin plated iron and galvanised iron are generally produced by

  • vaporising
  • hot dipping
  • electroplating
  • spraying
Q.16

Brinell hardness number (BHN) of a material is a number, which has

  • no dimension.
  • unit of length.
  • unity of force/area.
  • unit of force/length.
Q.17

Work hardening of a material

  • decreases its ductility.
  • decreases its tensile strength.
  • increases its ductility.
  • does not affect its ductility.
Q.18

Plants produce carbohydrates from the CO2 present in the atmosphere by

  • polymerisation.
  • photochemical reaction.
  • oxidation.
  • none of these.
Q.19

The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.

  • fluidity
  • basicity
  • acidity
  • viscosity
Q.20

The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the

  • fatigue strength
  • creep strength
  • resilience
  • endurance limit
Q.21

For a fixed cross-sectional area, the most economical channel section has maximum

  • wetted perimeter.
  • fluid discharge rate.
  • fluid velocity.
  • depth of flowing fluid.
Q.22

Energy required to compress a hot gas as compared to cold gas will be

  • more.
  • less.
  • same.
  • more or less depending upon the nature of the gas.
Q.23

A gas having a negative Joule-Thompson co-efficient, when throttled, will

  • become hotter.
  • become cooler.
  • remain unchanged.
  • liquefy.
Q.24

In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of

  • stainless steel
  • mild steel
  • high speed steel
  • high carbon steel
Q.25

Vanadium addition to steel improves its

  • high temperature oxidation resistance.
  • fatigue strength.
  • heat treatability by quenching.
  • hardenability.
Q.26

Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammonium

  • nitrate
  • sulphate
  • carbonate
  • chloride
Q.27

Identify the correct statement with reference to the extractive metallurgy of aluminium.

  • The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3.
  • Approximately 80% of the aluminium deposited on the cathode comes from cryolite.
  • Sodium is deposited along with aluminium, but is immediately vaporised.
  • Anode effect sets in when the cryolite concentration goes below 40%.
Q.28

The thermodynamic law, PVy = constant, is not followed by the

  • free expansion of an ideal gas.
  • adiabatic expansion of steam in turbine.
  • adiabatic compression of air.
  • ideal compression of air.
Q.29

Pellets are not as popular a burden as sinter in the iron blast furnace, because of their

  • shape.
  • swelling tendency.
  • poor reducibility.
  • low mechanical strength.
Q.30

In the commercial production of which of the following metals, matallothermic reduction is used ?

  • Copper
  • Zinc
  • Zirconium
  • Nickel
Q.31

Annealing of metal does not

  • precede its wire drawing.
  • induce softness and removes stresses & dissolved gases.
  • refine the crystalline structure & produce a definite microstructure.
  • alter toughness, ductility and magnetic & electrical or other physical properties.
Q.32

Dezincification is a form of corrosion espe-cially applicable to

  • brass
  • nichrome
  • stainless steel
  • monel
Q.33

A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to

  • particle diameter
  • particle diameter
  • (particle diameter)2
  • (particle diameter)3
Q.34

Pick out the wrong statement about the machinability of metals. Machinability of a metal

  • decreases with increase in strain hardening tendencies.
  • decreases with increase in hardness, in general.
  • depends on the composition, microstructure and physical & mechanical properties.
  • decreases with increases in tensile strength & decrease in grain size.
Q.35

A form of stress corrosion failure termed as 'season cracking' is generally observed in

  • thermosetting polymers.
  • high carbon steels.
  • brasses.
  • borosilicate glasses.
Q.36

Vanadium addition to steel improves its

  • high temperature oxidation resistance.
  • fatigue strength.
  • heat treatability by quenching.
  • hardenability.
Q.37

New water wells are disinfected with chlorine in the form of

  • sodium chloride
  • sodium hypochlorate
  • bleaching powder
  • aluminium chloride
Q.38

Which of the following is a common constituent of both paint and oil varnish ?

  • Extender
  • Pigment
  • Thinner
  • Drying oil
Q.39

Which of the following materials is not suitable as a die material for wire drawing?

  • Diamond
  • Tungsten carbide
  • Tool steel
  • Bronze
Q.40

Which of the following is not used as an alloying element in steel used for making permanent magnetic material ?

  • Tungsten
  • Chromium
  • Vanadium
  • Cobalt
Q.41

The refrigerant freon-is chemically

  • CCl2F2
  • CCl3F
  • CClF3
  • CCl4F
Q.42

Which of the following phenomenon will exhibit the minimum heat transfer?

  • Boiling.
  • Forced convection in air.
  • Free convection in air.
  • Conduction in air.
Q.43

In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will

  • decrease gradually.
  • increase gradually.
  • increase rapidly.
  • remain constant.
Q.44

Lithium is a useful alloying addition to aluminium, because it

  • is cheap.
  • imparts solid solution strengthening.
  • lowers density and contributes to age hardening.
  • improves the corrosion resistance of aluminium.
Q.45

By X-ray diffraction, it is not possible to determine the

  • preferred orientation.
  • residual localised stresses.
  • particle size.
  • ordered arrangement of magnetic moments.
Q.46

Pick out the wrong statement.

  • Geothermal energy is a non-conventional source of energy.
  • Mass is converted into energy in both nuclear fission & fusion reaction.
  • Inhalation of mercury vapour is not harmful for human beings.
  • Inhalation of arsenic causes cancer.
Q.47

A material is capable of resisting softening at high temperature, because of its property termed as

  • hot temper
  • hot hardness
  • fatigue
  • creep
Q.48

The underground well of a biogas plant is called the

  • septic tank
  • oxidation well
  • digestor
  • lagoon
Q.49

The delivery pressure of boiler feed water pump compared to the boiler steam pressure is

  • slightly more
  • same
  • slightly less
  • much more
Q.50

__________ is a non volatile film forming constituent of a paint.

  • Thinner
  • Dryer
  • Drying oil
  • none of these
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