Q.1

Identify the false statement

  • Martensitic steels are less susceptible to pitting corrosion than austenitic steels.
  • Pitting corrosion is usually very localised.
  • Hydrogen embrittlement is facilitated by tensile stress.
  • Stress corrosion cracking is facilitated by tensile stress.
Q.2

Function of gear box is to

  • reduce the speed.
  • obtain variable speed.
  • increase the speed.
  • produce high torque.
Q.3

Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.

  • 300
  • 800
  • 1400
  • 2000
Q.4

The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.

  • casting
  • pattern
  • draft
  • distoration
Q.5

The total frictional resistance to fluid flow does not depend upon the

  • roughness of the surface.
  • fluid pressure.
  • fluid density.
  • fluid velocity.
Q.6

Adhesives

  • can't be used in the form of pressure sensitive tapes.
  • can't join two dissimilar metals.
  • cure instantaneously after application on a surface.
  • none of these.
Q.7

Ganister contains maximum percentage of

  • FeO
  • SiO2
  • MgO
  • MnO2
Q.8

Maximum carbon content in cast iron is __________ percent.

  • 3.8
  • 4
  • 4.3
  • 4.6
Q.9

The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.

  • ambient
  • dry bulb
  • dew point
  • wet bulb
Q.10

Damage to metal surface by mechanical action is called

  • pitting
  • corrosion
  • erosion
  • none of these
Q.11

The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.

  • tension
  • shear
  • compression
  • bending & tension
Q.12

Ceramic materials are

  • organic in nature.
  • stronger in compression than in tension.
  • always amorphous in nature.
  • always bad heat conductors.
Q.13

Air-petrol ratio in an automotive petrol engine is around

  • 14 : 1
  • 22 : 1
  • 25 : 1
  • 4 : 1
Q.14

Gross national product (GNP) means the total value of __________ in a country.

  • goods produced
  • gold reserve
  • earning of the citizens
  • taxes paid
Q.15

Pearlite comprises of

  • 87% cementite & 13% Fe.
  • 87% ferrite & 13% cementite.
  • 93.33% ferrite & 6.67% C.
  • 87% ferrite & 13% C.
Q.16

Fatigue strength of a material can not be increased by

  • cold working
  • hot working
  • shot peening
  • any of these
Q.17

Stretcher strains found in a low carbon sheet are associated with the

  • texture.
  • dislocation density.
  • yield point phenomenon.
  • thickness of the sheet.
Q.18

In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.

  • 20
  • 60
  • 120
Q.19

Nitrogen is not an essential component of

  • protein
  • urea
  • oils & fats
  • any of these
Q.20

Screws are specified by their __________ diameters.

  • minor
  • major
  • pitch
  • none of these
Q.21

The escape velocity of a body on earth which is independent of its mass is about __________ km/second.

  • 3
  • 7
  • 11
  • 15
Q.22

Which of the following is not categorised as the ore agglomeration process ?

  • Nodulising
  • Pelletising
  • Balling
  • Briquetting
Q.23

Dryness fraction of dry steam is

  • 0
  • 1
  • 0.5
Q.24

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

  • resilience
  • toughness
  • ductility
  • impact strength
Q.25

Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.

  • 0.8
  • 7.8
  • 200
  • 10000
Q.26

Which of the following if present in iron ore, enhances its value ?

  • Alumina
  • Alkali oxide
  • Lime & Magnesia
  • None of these
Q.27

Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal

  • tensile strength.
  • compressive strength.
  • Young's modulus.
  • thermal co-efficient of expansion.
Q.28

The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system

  • is as light as possible.
  • has very high C.O.P.
  • employs minimum quantity of refrigerant.
  • consumer minimum horse power.
Q.29

Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its

  • lower cost.
  • abundant availability.
  • resistance to vegetable acids as the tin plate are commercially used in 'canning' industry.
  • none of these.
Q.30

Normalising of a casting does not

  • induce stresses in it.
  • refine its grain structure.
  • reduce seggregation.
  • improve its mechanical properties.
Q.31

In inventory control theory, the economic order quantity (EOQ) is the

  • lot size corresponding to break even analysis.
  • average level of inventory.
  • optimum lot size.
  • none of these.
Q.32

The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the __________ point of the material.

  • elastic
  • ultimate
  • yielding
  • breaking
Q.33

A material being tested for endurance strength is subjected to the __________ load.

  • impact
  • completely reversed
  • dynamic
  • static & dynamic
Q.34

With increase in temperature, the surface tension of water

  • increases
  • decreases
  • remains constant
  • increases linearly
Q.35

Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?

  • Anodising
  • Tempering
  • Carburising
  • Annealing
Q.36

Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode

  • occurs higher in the electro-chemical series of metals.
  • is exemplified by magnesium plate.
  • is much cheaper than the cathodic base material to be guarded against corrosion.
  • all (a), (b) & (c).
Q.37

Electrochemical corrosion can occur, only if __________ is present in contact with metal.

  • air
  • oxygen
  • liquid medium
  • gaseous medium
Q.38

The co-ordination number in simple cubic structure is

  • 4
  • 6
  • 8
  • 12
Q.39

As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.

  • 110
  • 85
  • 60
  • 45
Q.40

Out of the following the refractive index is the highest for

  • glass
  • diamond
  • brine
  • kerosene
Q.41

Which of the following is resistant to the action of both heat & chemicals ?

  • Boro silicate glass,
  • Silica glass.
  • Soda lime glass.
  • none of these.
Q.42

The swift cup test evaluates the following property of a sheet metal.

  • Stretchability
  • Drawability
  • Bendability
  • None of these
Q.43

The main charge in blast furnace is usually

  • iron ore & coke.
  • iron ore, coke & air.
  • limestone, coke & iron ore.
  • limestone, sand & iron ore.
Q.44

With increase in pressure, the latent heat of steam

  • increases.
  • decreases.
  • remains unchanged.
  • data insufficient; can't be predicted.
Q.45

Heat required to raise the temperature of a body by 1 °C is called its

  • heat capacity.
  • specific heat capacity.
  • thermal conductivity.
  • water equivalent.
Q.46

Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding

  • glycerol
  • nitro cellulose
  • camphor
  • none of these
Q.47

Out of the following surfaces, the emis-sivity will be minimum for

  • aluminium foil
  • concrete
  • plaster
  • smooth glass
Q.48

__________ is the most important element, which controls the physical properties of steel.

  • Manganese
  • Silicon
  • Carbon
  • Vanadium
Q.49

The atmospheric temperature during melting of ice/snow (in the atmosphere)

  • decreases
  • increases
  • remains same
  • may increase or decrease ; depends on the altitude where snow melts
Q.50

Coating of zinc over steel is known as

  • cladding
  • galvanising
  • anodising
  • passivation
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