Q.1

Preheating prior to welding is done for the purpose of

  • decreasing cooling rate.
  • facilitating fusion of high melting metals.
  • preventing hot cracking.
  • ensuring full penetration.
Q.2

The basic function of the drum in a boiler is to

  • act as a storage for feed water.
  • act as a storage for steam.
  • separate steam from water.
  • remove settling impurities from steam.
Q.3

'Flare tower' used in industry is meant for

  • venting off (after burning) the excess inflammable/toxic gases at high pressure.
  • absorbing the pollutant gases from the furnace exhaust.
  • cooling of furnace exhaust gases.
  • none of these.
Q.4

In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:Which of the following is a cermet ?

  • Zirconia
  • Alumina
  • Bakelite
  • Tungsten carbide
Q.5

The ultimate strength in tension for steel is __________ times the ultimate strength in shear.

  • 0.5
  • 0.9
  • 1.5
  • 2.5
Q.6

The function of a nozzle provided in steam turbine is to

  • throttle down (i.e., reduce) the pressure of steam.
  • convert internal energy into kinetic energy.
  • increase the velocity of steam.
  • all (a), (b) & (c).
Q.7

Optical activity is a/an __________ property.

  • additive
  • constitutive
  • both (a) & (b)
  • neither (a) nor (b)
Q.8

__________ the exhaust gas is an indication of the incomplete combustion of fuel.

  • Low temperature of
  • High temperature of
  • High % of CO in
  • High % of CO2 in
Q.9

Presence of sulphur in steel reduces the

  • hardness.
  • grain size.
  • tensile strength.
  • toughness & transverse ductility.
Q.10

Pick out the wrong statement.

  • The X-rays can not be deflected by electric field unlike cathode rays.
  • The intensity of X-rays can be measured by ionisation current produced due to the ionisation of gas by X-rays.
  • The quality of X-rays can be controlled by varying the anode-cathode voltage.
  • Crystal structure of a material can be studied by an electron microscope.
Q.11

Which of the following has the highest modulus of elasticity (about 7 x 106 kg/cm2) ?

  • High speed steel
  • Stainless steel
  • Tungsten carbide
  • Superalloys
Q.12

Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-°C. The purpose of electric current supplied to the furnace is to

  • achieve very high purity of aluminium (99.9%).
  • keep the electrolyte in liquid condition by the generation of heat.
  • electrolytically dissociate alumina.
  • both(b) & (c).
Q.13

A cylinderical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is

  • 0
  • 0.33
  • 0.44
  • 0.25
Q.14

Enzymes belong to the category of

  • proteins
  • carbohydrates
  • vitamins
  • fats
Q.15

What is the value of included angle of a triangular notch for maximum discharge ?

  • 30°
  • 60°
  • 90°
  • 120°
Q.16

Baffles provided on the shell side of a shell and tube heat exchanger are meant for

  • providing support for the tubes.
  • improving heat transfer.
  • both 'a' & 'b'.
  • preventing the fouling of tubes & stagnation of shell side fluid.
Q.17

On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal.

  • frequency
  • amplitude
  • damping
  • none of these
Q.18

Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?

  • enthalpy
  • relative humidity
  • wet bulb temperature
  • dew point temperature
Q.19

The activity of pure hydrogen gas at 1000°C and 5 atm pressure

  • is always less than 1.
  • is always greater than 1.
  • can be 5.
  • depends on the choice of the standard state.
Q.20

Which of the following transducers is most commonly used for the measurement of shock and vibration ?

  • Linear variable differential transducer (LVDT)
  • Dial gauge
  • Accelerometer
  • none of these
Q.21

Which of the following polymers is obtained by copolymerisation of three monomers ?

  • SAN
  • ABS
  • SBR
  • PTFE
Q.22

Solution loss reaction occurs

  • in the blast furnace shaft.
  • during pretreatment of hot metal.
  • in the L.D. process.
  • during deoxidation in the ladle.
Q.23

Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be

  • 9.5:1
  • 12.5:1
  • 15.5 :1
  • 18.5 : 1
Q.24

Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?

  • Cresylic acid
  • Xanthaies
  • Pine oil
  • all 'a' 'b' & 'c'
Q.25

Colloids can be purified by

  • dialysis
  • reverse osmosis
  • coagulation
  • peptization
Q.26

Dry saturated steam can be converted into superheated steam by

  • increasing its cross-sectional area of flow.
  • passing it through a pressure reducing valve.
  • forcing it downwards through a vertical tube.
  • none of these
Q.27

Gantt charts are used for streamlining the

  • inventory control
  • production schedule
  • sales forecasting
  • quality control
Q.28

__________ iron is produced by the annealing of white cast iron.

  • Malleable
  • Nodular
  • Ductile
  • Grey
Q.29

Dephosphorisation of molten pig iron is favoured by

  • oxidising and basic slag.
  • reducing and basic slag.
  • high activity co-efficient of phosphorous in metal.
  • oxidising and neutral slag.
Q.30

All radiations falling on a black body are

  • refracted
  • reflected
  • transmitted
  • absorbed
Q.31

The surface tension of a liquid, at critical temperature is

  • indeterminate.
  • zero.
  • infinity.
  • same as that at any other temperature.
Q.32

For separating small pieces of metal from engine oil of a car, the best separating technique is the

  • chromatography
  • evaporation
  • filtration
  • fractional distillation
Q.33

When an isolated thermodynamic system executes a process,

  • work is done.
  • heat transfer takes place.
  • mass flow occurs across the boundary of the system.
  • no chemical reaction takes place within the system.
Q.34

Fire refining process is employed in case of

  • tin
  • copper
  • zinc
  • aluminium
Q.35

Which of the following metals can not be hot worked at room temperature ?

  • Zinc
  • Nickel
  • Lead
  • Tin
Q.36

The power of a low capacity prime mover is most suitably measured by a __________ type dynamometer.

  • driving
  • transmission
  • absorption
  • none of these
Q.37

Silicon percentage in the silicon steel used for electrical appliances/equipments is

  • 0.3-0.4
  • 12-14
  • 3-4
  • 20-25
Q.38

Out of the following materials, the one which generally exhibits an yield point is

  • hard bronze
  • soft brass
  • cold rolled mild steel
  • hot rolled mild steel
Q.39

Frost formation on the evaporator tubes in the domestic refrigerators

  • can be prevented by proper design.
  • decreased compressor power.
  • causes heat loss due to poor heat transfer.
  • is immaterial.
Q.40

Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.

  • volume
  • pressure
  • heat
  • none of these
Q.41

The most prominent single cause of corrosion in boilertubes, drums, economisers and steam superheaters in a thermal power plant boiler is the

  • water alkalinity & leakage.
  • hydrazine addition during feed water treatment.
  • release of non-condensable gas from water in the boiler.
  • scale formation.
Q.42

Pick out the wrong statement.

  • Copper is the metal having the highest electronic conductivity.
  • Hardenability & weldability of metals are inversely related.
  • Covalant bonding formed by sharing of electrons is present in all semi-conductor materials.
  • Glass transition temperature applies to 'polymers' but not to 'glasses'.
Q.43

In the Bayer's process, bauxite is digested under pressure using

  • H2SO4
  • NaOH
  • NH3
  • HCl
Q.44

The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the

  • final control element.
  • on-off control.
  • floating control action.
  • none of these.
Q.45

In a neutral solution

  • H+ ions are absent.
  • OH- ions are absent.
  • both H+ and OH- ions are present in very small but equal concentration.
  • none of these.
Q.46

Styrofoam is the commercial name of

  • polyurathene
  • polystyrene
  • polyacrylonitrile
  • polybutadiene
Q.47

Large scale fire on fuel gas line is normally extinguished by

  • water
  • steam
  • foam
  • nitrogen
Q.48

Which of the following is an unconventional source of energy ?

  • Thermal power
  • Hydroelectric power
  • Nuclear-fusion power
  • Solar power
Q.49

On-off control

  • fully opens the final control element, when the measured variable is below the set point.
  • fully closes the final control element, when the measured variable is above the set point.
  • is a two position control (fully open or fully closed) control adequate to control a process with slow reaction and minimum dead time or transfer lag.
  • none of these.
Q.50

Feed check valve is used in steam boilers to

  • check the water level in the boiler.
  • check the feed water flow rate.
  • feed high pressure water to boiler and guard against its backflow through it.
  • none of these.
0 h : 0 m : 1 s