Q.1

Powder metallurgy process does not make metal powder by

  • atomisation
  • grinding/milling
  • hammering
  • electrolytic deposition
Q.2

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

  • compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller.
  • maintaining vacuum on tube side is more difficult than that on the shell side.
  • water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.
  • condenser can act as a storage unit for condensed steam.
Q.3

Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)

  • A
  • l
  • A2
  • both 'a' & 'b'
Q.4

Nuclear fission of one atom of uranium-produces the energy equivalent to about __________ MeV.

  • 20
  • 200
  • 500
  • 1000
Q.5

__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.

  • Beryllia
  • Zirconia
  • Alumina
  • Magnesia
Q.6

If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity

  • is trebled.
  • remains unchanged.
  • decreases by a factor of 3.
  • decreases by a factor of 1/3.
Q.7

In the blast furnace, incorporation of water vapour in the blast gives the following effect.

  • Increases the hydrogen content in the metal.
  • Increases the reducing potential of the gas.
  • Increases the flame temperature.
  • No significant change occurs.
Q.8

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

  • Grashoff number.
  • Grashoff number & Reynolds number.
  • Reynolds number.
  • Grashoff number & Prandtl number.
Q.9

Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)

  • H
  • H/2
  • H/4
  • H/6
Q.10

__________ of air does not increase with increase in temperature.

  • Density
  • Thermal diffusivity
  • Viscosity
  • Thermal conductivity
Q.11

The most suitable material of construction for a sewer to carry sewage under high pressure is

  • asbestos cement
  • steel
  • cement concrete
  • stoneware
Q.12

Case hardening is not done by

  • nitriding
  • hot dipping
  • electroplating
  • both b & c
Q.13

Cobalt -is used as a source of __________ in medical therapy & industrial radiography.

  • X-rays
  • γ-rays
  • α-rays
  • β-rays
Q.14

A solar cell converts the sunlight directly into __________ energy.

  • thermal
  • electrical
  • mechanical
  • chemical
Q.15

Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?

  • Emissivity of pipe surface.
  • Diameter & length of the pipe.
  • Temperature of hot pipe surface & that of air in the room.
  • none of these.
Q.16

Titanium alloys are welded using the Following process:

  • TIG welding.
  • Submerged arc welding.
  • Butt welding.
  • Electron beam welding.
Q.17

Copper deposits are found in India at the following location:

  • Kudremukh
  • Kolar
  • Khetri
  • Ramagundam
Q.18

Pick out the wrong statement.

  • A ferromagnetic material becomes paramagnetic above the 'Curie temperature'.
  • Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials.
  • Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces.
  • Tungsten steel and alnico are not hard magnetic materials.
Q.19

The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be

  • parabolic
  • hyperbolic
  • straight line
  • none of these
Q.20

Propulsion of rocket follows from the

  • Newton's second law of motion.
  • Newton's third law of motion.
  • law of projectiles.
  • Archimedes principle.
Q.21

Spherical shape of mercury droplets is due to its

  • high viscosity.
  • low surface tension.
  • high density.
  • high surface tension.
Q.22

Filler material used in welding should have __________ as compared to the parent metal to be welded.

  • lower melting temperature
  • same melting temperature
  • same composition
  • both 'b' & 'c'
Q.23

Satellites burn off during re-entry to earth's atmosphere, because of the

  • combustion with air.
  • gravitational pull by earth.
  • friction with earth's atmosphere.
  • loss in weight of the satellite.
Q.24

With increase in compression ratio, the volumetric efficiency of air compressor

  • increases.
  • decreases.
  • remains same.
  • may increase or decrease (depends on the suction pressure).
Q.25

Absolute zero pressure can be attained at a temperature of

  • 0°C
  • 50°K
  • 0°R
  • none of these
Q.26

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.

  • critical
  • breeder
  • fertile
  • heterogenous
Q.27

The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

  • more
  • equal
  • less
  • double
Q.28

Machinability of hard alloys and tool steels is improved by

  • spherodising
  • annealing
  • tempering
  • normalising
Q.29

Laser welding is widely employed in the __________ industries.

  • electronic
  • structural
  • process
  • heavy
Q.30

An alloy of Fe - 0.4 % C is

  • cast iron.
  • hypo-eutectoid steel.
  • hyper-eutectoid steel.
  • eutectoid steel
Q.31

Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.

  • 10-3
  • 103
  • 10-15
  • l015
Q.32

The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.

  • 60 - 100
  • 400 - 700
  • 1200 -1500
  • 2000 - 2300
Q.33

To counteract the bad effects of strain hardening on a cold formed part, it must be

  • tempered
  • normalised
  • annealed
  • hardened
Q.34

With increase in annealing temperature, the following defect density decreases.

  • Vacancy
  • Dislocation
  • Grain boundary
  • All of them
Q.35

Energy of the sun arises mainly from __________ reactions.

  • fusion
  • fission
  • combustion
  • none of these
Q.36

In multipass welds, shot peening is done after each pass to

  • close the surface porosity.
  • break the continuity of columnar grains.
  • flatten the weldment.
  • introduce texture in the weld.
Q.37

Pick out the correct statement.

  • Materials exhibiting high elasticity obey Hooke's law.
  • The elastic behaviour of rubber under compression is the same as its behaviour under tension.
  • The damping capacity of a material is due to its plastic deformation.
  • The stress required to cause plastic flow in polycrystalline material is higher as compared to monocrystalline materials due to the presence of grains of different orientations.
Q.38

Sub zero treatment of steel is done to

  • suppress martensite transformation.
  • enhance its working performance in sub zero atmosphere.
  • reduce the retained austenite in hardened steel.
  • induce temper brittleness after its hardening.
Q.39

Oxygen cylinders used for autogenous (cutting/welding) purposes are

  • seamless & made of steel.
  • heat treated before use.
  • made by sand casting.
  • welded steel cylinders.
Q.40

Neutrons are present in all atoms except that of

  • He
  • C
  • H
  • Ar
Q.41

The product out from a cupola is called

  • wrought iron
  • pig iron
  • cast iron
  • none of these
Q.42

Wrought iron is never shaped by

  • casting
  • cold working
  • forging
  • welding
Q.43

The specific gravity of coal depends mainly on its __________ content.

  • carbon
  • volatile matter
  • ash
  • moisture
Q.44

Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.

  • cementite
  • austenite
  • martensite
  • pearlite
Q.45

Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.

  • bomb
  • throttling
  • Junker's
  • Boy's
Q.46

Which of the following is used to produce draught in the locomotive boilers ?

  • Chimney.
  • Induced draught fan.
  • Forced draught fan.
  • Steam jet arrangement.
Q.47

A material in which the atoms are arranged regularly in some directions but not in others, is termed as 'mesomorphous material'; an example of which is

  • lead
  • glass
  • mica
  • silver
Q.48

Corrosion of metals can not be prevented by its

  • tempering
  • chromising
  • aluminising
  • alloying
Q.49

Maximum permissible air velocity in pipelines is about __________ metre/second.

  • 5
  • 10
  • 20
  • 40
Q.50

The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then

  • wet bulb temperature=dry bulb temperature.
  • wet bulb temperature=dew point temperature.
  • saturation temperature=dew point temperature.
  • all 'a' , 'b' & 'c'
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