Q.1

The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the

  • resilience
  • toughness
  • ductility
  • impact strength
Q.2

A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2.

  • 6
  • 18
  • 38
  • 52
Q.3

The main constituent of bones is

  • CaF2
  • Ca3(PO4)2
  • CaCO3
  • CaCl2
Q.4

Iron content in Indian iron ore is about __________ percent.

  • 80-85
  • 60-65
  • 40-45
  • 20-25
Q.5

The normal stress is the same in all directions at a point in a fluid, only when the fluid

  • is at rest & has zero viscosity.
  • is frictionless.
  • fluid layer has no motion relative to an adjacent layer of fluid.
  • is incompressible & frictionless.
Q.6

Dielectric

  • is an electrical insulating material.
  • of low resistivity is preferred.
  • should have high thermal conductivity.
  • need not defy the corrosive action of chemicals.
Q.7

Potable water means the water used for

  • fire-fighting
  • cooling
  • drinking
  • evaporation to produce steam
Q.8

Non-ferrous alloys used for making cutting tools need not have high

  • abrasion resistance
  • toughness
  • red hardness
  • cutting speed
Q.9

The trace metal present in insulin is

  • Cu
  • Zn
  • Fe
  • Ni
Q.10

Photographic plates are coated with

  • silver nitrate
  • silver halide
  • calcium silicate
  • metallic silver
Q.11

Diamagnetic materials

  • are magnetised by eddy currents only.
  • are non-magnetic and can not be magnetised.
  • are magnetised in direction opposite to the magnetic field.
  • can be magnetised in one direction only.
Q.12

Carbon supply in pack carburising process is in the form of

  • charcoal
  • calcium carbide
  • hydrocarbon oil
  • graphite
Q.13

Globular form of cementite is formed during the __________ process.

  • spherodising
  • hardening
  • annealing
  • normalising
Q.14

The heat treatment to which the steel wire containing > 0.carbon is subjected to is

  • full annealing
  • bright annealing
  • patenting
  • none of these
Q.15

A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec2 is

  • 8.82
  • 9.81
  • 10.88
  • 0.95
Q.16

Normalising of an object does not

  • refine coarse grain structure obtained during hot working.
  • improve ductility.
  • improve yield strength.
  • improve machanical properties.
Q.17

One ton of refrigeration is not equivalent to the heat removal rate of

  • 200 BTU/minute
  • 50 kcal/minute
  • 50 kJ/sec.
  • 3.5 KW
Q.18

Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.

  • forging
  • cold rolling
  • hot rolling
  • casting
Q.19

Cold cracking in the heat affected zone of a high strength steel weld can take place because of the

  • retained austenite.
  • martensite formation.
  • relatively high sulphur content in the base metal.
  • sufficient hydrogen present in the welding arc.
Q.20

Hardening of steel is not possible, unless it is heated __________ critical point.

  • above the highest
  • above the lowest
  • between the first & second
  • between the second & third
Q.21

In connection with corrosion of metals, passivation is the process that

  • intensifies deterioration.
  • changes the composition of the metal.
  • inhibits further deterioration.
  • none of these.
Q.22

For the irreversible reaction, Ca+= Ca C2 , Δ H°= -J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved atK will be

  • 30000 J
  • 60000 J
  • 90000 J
  • 240000 J
Q.23

A fluid is termed as the Newtonion fluid, when the shear stress is __________ the velocity gradient.

  • independent of
  • inversely proportional to
  • directly proportional to
  • none of these
Q.24

Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is

  • black
  • silver grey
  • green
  • yellow
Q.25

Water hammer is caused in steam carrying pipelines, because of

  • partial condensation of steam.
  • vibration of the pipeline.
  • high degree of superheat of steam.
  • its exposure to torrential rain.
Q.26

Dislocation cross-slip is difficult in those materials, which have

  • large number of slip systems.
  • high work hardening rate.
  • coarse grain size.
  • low stacking fault energy.
Q.27

With increase in temperature, the electrical conductivity of a __________ decreases.

  • semi-conductor
  • metal or alloy
  • dielectric
  • none of these
Q.28

Faraday's law of electrolysis is related to the

  • cation speed.
  • atomic number of the cation.
  • equivalent mass of the electrolyte.
  • none of these.
Q.29

__________ of hard alloy and tool steel is done to make it easily machinable.

  • Case carburising
  • Tempering
  • Normalising
  • Annealing
Q.30

Starting friction is low in case of the __________ lubrication.

  • boundary
  • hydrodynamic
  • hydrostatic
  • mixed/semi-fluid
Q.31

Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be

  • more
  • less
  • same
  • either more or less; depends on the climatic conditions.
Q.32

The burnout heat flux in the nucleate boiling regime is not a function of the

  • liquid density.
  • vapour density.
  • temperature difference.
  • heat of evaporation.
Q.33

For a first order chemical reaction, the concentration of the reactant decreases __________ with time.

  • linearly
  • exponentially
  • logarithmically
  • inversely
Q.34

Hot extrusion of aluminium is done in the temperature range of __________ °C.

  • 550-600
  • 450-500
  • 350-400
  • 250-300
Q.35

Drossing is a __________ operation.

  • smelting
  • dressing
  • roasting
  • dressing
Q.36

Isotropic materials have the same __________ in all directions.

  • induced stresses
  • density
  • elastic properties
  • thermal properties
Q.37

With increase in impurities in metals, their corrosion resistances

  • increase
  • decrease
  • remain same
  • may increase or decrease ; depending on the type of metal
Q.38

Projection welding & stud welding is categorised as the __________ welding.

  • pressure
  • thermit
  • resistance
  • arc
Q.39

Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the

  • length of the pipe.
  • diameter of the pipe.
  • density of the fluid.
  • velocity of the fluid.
Q.40

What is the percentage of chromium in 18-4-1 high speed steel ?

  • 1
  • 4
  • 18
  • 23
Q.41

Powder metallurgy is used to produce

  • high precision components with complex cavities and sharp features.
  • components of large size.
  • porosity free components.
  • components of such alloys whose constituents do not form alloys readily.
Q.42

Shrinkage allowance on pattern is provided to compensate for shrinkage when the

  • metal changes from liquid state to solid state at freezing temperature.
  • solid phase temperature drops from freezing temperature to the room temperature.
  • liquid metal temperature drops from pouring temperature to room temperature.
  • liquid metal temperature drops from pouring temperature to freezing temperature.
Q.43

All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.

  • deuterium
  • hydrogen
  • neon
  • helium
Q.44

The two elements required to form substitutional solid solution should not have

  • same crystalline structure.
  • same valancy
  • widely differing electronegativity.
  • same atomic sizes.
Q.45

Coating provided on the electrodes used in the arc welding is not expected to

  • add alloying elements.
  • prevent electrode from contamination.
  • stabilise the arc.
  • provide protective atmosphere to weld.
Q.46

Which of the following mainly decides the current to be employed is arc welding ?

  • Electrode size
  • Plate thickness
  • Voltage across the arc
  • Welded portion length
Q.47

What is the pH of distilled water ?

  • 0
  • 1
  • 7
  • 14
Q.48

The machanism involved in the removal of metal in drilling operation is by

  • compression
  • extrusion
  • shearing
  • both 'b' & 'c'
Q.49

Ultimate strength in tension as compared to that in shear for steel is

  • half
  • one third
  • one and half times
  • one fourth
Q.50

Glycerene is used as a coolant in cooling of some engines instead of water, because

  • its higher boiling point (290°C) increases its heat carrying capacity.
  • compartively less weight of coolant is required.
  • smaller radiator can be used.
  • all a, b & c.
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