Q.1

The best guide to judge the general quality of water is the measurement of its

  • pH value.
  • electrical conductivity.
  • turbidity.
  • dissolved oxygen content.
Q.2

The following is employed as sacrificial anode to provide cathodic protection to ships, pipelines and storage tanks.

  • Iron
  • Copper
  • Nickel
  • Magnesium
Q.3

Which of the following is not a principal alloying element for the structural steel?

  • Molybednum
  • Nickel
  • Manganese
  • Chromium
Q.4

Load cells used for the measurement of weight has

  • compact & rugged construction with an accuracy of 0.1 to 1%.
  • no moving parts and incurs negligible deflection under load.
  • provision of thermal compensation and is hermetically sealed.
  • all 'a', 'b' & 'c'
Q.5

__________ is used for tying the steel coloumns to concrete foundation.

  • Grouting
  • Eyebolt
  • Anchor bolts
  • Refractory castables
Q.6

Thermit welding uses the following energy source.

  • Electrical energy.
  • Chemical energy.
  • Energy of high velocity electrons.
  • Heat generated by friction.
Q.7

Blast furnace slag is mainly molten

  • sand
  • magnesium silicate
  • calcium silicate
  • iron pyrite
Q.8

A jet engine turbine blade is normally manufactured by

  • forging.
  • shell moulding.
  • investment casting.
  • pressure die casting.
Q.9

The leaching solvent used in Baeyer's process for the purification of bauxite is

  • ammonium hydroxide
  • sodium carbonate
  • sodium hydroxide
  • ammonium carbonate
Q.10

Cathodic protection is widely used in controlling corrosion in

  • high pressure vessels.
  • marine structure & underground pipelines.
  • overhead fuel gas pipelines.
  • overhead water pipelines.
Q.11

Methyl orange indicator turns

  • orange yellow in alkaline medium.
  • orange yellow in acidic medium.
  • colourless in acidic medium.
  • colourless in basic medium.
Q.12

Which of the following is a commonly used manometric liquid for low pressure range?

  • Ethyl alcohol
  • Carbon tetrachloride
  • Glycerol
  • Ethylene glycol
Q.13

Silicon in steel

  • makes it usable in almost all magnetic circuits where alternating current is used.
  • increases its electrical resistivity and decreases the hysteresis loss.
  • is present upto 5% & 4% respectively when used in transformers & motor armatures.
  • all 'a', 'b' & 'c'.
Q.14

Pick out the correct combination about the role of various additives used in polymers.

  • Plasticiser : increases the polymer strength.
  • Heat stabiliser : increases the maximum service temperature.
  • Fillers: Does not affect the property of polymer but increases its weight.
  • Lubricants: increases the flexibility of polymers.
Q.15

Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.

  • hot rolled mild
  • cold rolled mild
  • forged
  • machinable stainless
Q.16

In a good rimming steel

  • carbon and silicon should be low.
  • silicon should be low but carbon should be high.
  • both silicon & carbon should be high.
  • silicon should be high but carbon should be low.
Q.17

Which of the following does not have a sharp melting point ?

  • Thoria
  • Glass
  • Ice
  • Pig iron
Q.18

Steel balls are manufactured by

  • sintering
  • casting
  • cold heading
  • spinning
Q.19

__________ temperature remains constant during adiabatic saturation process of unsaturated air.

  • Dew point
  • Dry bulb
  • Wet bulb
  • None of these
Q.20

Wrought iron is not

  • ductile & resistant to corrosion/rusting.
  • weldable easily.
  • having uniform strength in all directions.
  • having maximum tensile strength along the lines of slag distribution.
Q.21

Heat transfer by __________ is almost absent in case of fluidised bed drying operation.

  • radiation
  • conduction
  • convection
  • both (b) & (c)
Q.22

Metalloids

  • are good conductor of heat & electricity.
  • act as electron donors with metals & as electron acceptor with non-metals.
  • are not necessarily solids at room temperature.
  • are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron.
Q.23

While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.

  • 1800
  • 2000
  • 2400
  • 3000
Q.24

Fatigue resistance of a material is measured by the

  • elastic limit.
  • ultimate tensile strength.
  • Young's modulus.
  • endurance limit.
Q.25

The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the

  • pipe roughness & pipe diameter.
  • fluid velocity.
  • type of flowing fluid.
  • both 'b' & 'c'.
Q.26

Stainless steel is welded using

  • oxy-acetylene flame.
  • oxy-hydrogen flame.
  • arc welding.
  • inert gas arc welding.
Q.27

Austempering process results in the formation of __________ structure.

  • martensitic
  • bainitic
  • carburised
  • stressed
Q.28

The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.

  • creep
  • endurance
  • fatigue
  • none of these
Q.29

The lightest non-inflammable gas is

  • H2
  • He
  • Ar
  • O2
Q.30

Nitriding of a steel part does not increase its

  • grain size.
  • fatigue limit.
  • surface hardness.
  • wear resistance.
Q.31

"'Dikes' are low height walls made around the storage vessels meant for storing hazardous & inflammable material (e.g., petroleum products). Volume of dikes is equal to (where, V = volume of the storage vessel)

  • V
  • V/2
  • 2V
  • 3V
Q.32

__________ fluid force is not considered in the Navier-Stokes equation.

  • Turbulent
  • Viscous
  • Gravity
  • Pressure
Q.33

The best lubricants for a machine working at high temperature & load is

  • grease
  • solid lubricant
  • animal oils
  • mineral oils
Q.34

Which of the following is the largest quantum of pressure?

  • 1 kg/cm2
  • 1 bar
  • 1 atmosphere
  • 1 kilo Pascal
Q.35

Increasing the carbon content of steel

  • reduces the upper shelf energy.
  • increasing the ductility transition temperature.
  • decreases brittleness.
  • decreases hardness.
Q.36

Pick out the wrong statement

  • Processing of themosetting plastics is ideally done by injection moulding.
  • Processing of thermoplastics is ideally done by compression moulding.
  • Mass production of seamless pipes are done by electrical resistance welding (ERW).
  • Stretch forming is a process of cold drawing.
Q.37

For the Stoke's law to be valid in the case of a falling sphere in a fluid, the

  • Reynolds number (based on sphere diameter) should be < 1.
  • flow around the sphere should be in turbulent region.
  • sphere must be metallic.
  • fluid density should be constant.
Q.38

__________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten.

  • Stellite
  • High speed steel
  • Cermet
  • Alnico
Q.39

Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.
A. Induced draft fan B. Economiser C. Air preheater D. Steam superheater
Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories ?

  • A, C, B, D
  • D, B, C, A
  • D, C, B, A
  • D, A, B, C
Q.40

The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C inhours is __________ BTU/hr.

  • 100
  • 200
  • 1000
  • 2000
Q.41

__________ of grey cast iron produces white cast iron.

  • Tempering
  • Rapid heating
  • Rapid cooling
  • Slow cooling
Q.42

As the fluid flow rate increases, the float of the rotameter

  • rises in the tube.
  • rotates at higher speed.
  • rotates at lower speed.
  • drops down in the tube.
Q.43

What is the value of entropy at 273°K ?

  • 0
  • 1
  • ∞
  • none of these
Q.44

One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W . m-1 . k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is

  • 100
  • 900
  • 9000
  • 10000
Q.45

Which of the following is not a charge material for cupola ?

  • Limestone
  • Iron scrap
  • Iron ore
  • Pig iron
Q.46

Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore ?

  • High fusibility & fluidity.
  • High thermal conductivity.
  • Low density.
  • High chemical activity.
Q.47

Lead is poured into the joints between two __________ pipes.

  • cast iron
  • steel
  • concrete
  • plastic
Q.48

'Ice point' is designated on Farenhite temperature scale by

  • 0°
  • 32°
  • 62°
  • 212°
Q.49

A dense structure of grinding wheel is not used for the

  • ductile material.
  • hard materials.
  • brittle materials.
  • finishing cuts.
Q.50

Case hardening of a material is

  • followed by tempering or carburising.
  • preceded by its tempering.
  • done to get a soft ductile interior with a very hard surface.
  • carried out to get extreme hardness in its core.
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