Q.1

Cold chiesel's hammers are made of

  • high speed steel
  • high carbon steel
  • forged steel
  • mild steel
Q.2

Electrometallurgical methods of metal extraction is normally used for those metals

  • whose oxide/ore is not reduced by carbon.
  • which fall in the category of alkali & alkaline earth metals.
  • which stands higher in the electrochemical series of the metal.
  • all (a), (b) & (c).
Q.3

Pick out the correct statement

  • Jet engine can work, where there is no atmosphere.
  • Rocket engines cannot work, where there is no atmosphere.
  • Rocket engines carry oxygen required for the combustion in the form of oxidiser.
  • Jet engines also carry oxidiser.
Q.4

For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs.and sales price is Rs.per toy. The break even production per month will be __________ toys.

  • 250
  • 500
  • 1000
  • 3000
Q.5

Cemented carbide tools are not suitable for cutting

  • aluminium
  • brass
  • cast iron
  • steel
Q.6

For an ideal gas, Cp - Cv is

  • R
  • -R
  • 0
  • (3/2) R
Q.7

A material having good damping property is likely to have

  • greater defect density.
  • fine grained structure.
  • lesser defect density.
  • high tensile strength.
Q.8

In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be

  • higher, as it gives higher wavelength.
  • lower, as it gives higher wavelength.
  • higher, as it gives shorter wavelength.
  • lower, as it gives shorter wavelength.
Q.9

Pick out the wrong statement:

  • Soft water is more corrosive than that carrying calcium salts.
  • The corrosion of brass condenser tubes handling brine solution is also termed as 'dezincification'.
  • Non-annealed brass is highly susceptible to season cracking (i.e., inter-crystal corrosion due to internal stresses).
  • Pure copper is highly susceptible to stress corrosion.
Q.10

Lowering of recrystallisation temperature of metals can be achieved by its

  • grain refinement.
  • purification.
  • working at lower temperature.
  • all a, b & c.
Q.11

Ammonia gas can be dried by

  • PCl5
  • quick lime
  • CaCl2
  • concentrated H2SO4
Q.12

Hydrogen can be

  • used in I.C. engines as fuel.
  • liquefied & stored under cryogenic conditions.
  • produced by electrolysis of water.
  • all(a), (b) & (c).
Q.13

The difference between gross & net calorific values of fuel is due to the

  • sensible heat carried away by the flue gases.
  • heat carried away by the steam from the moisture content of the fuel.
  • heat lost by radiation.
  • heat carried away by steam from the combustion of hydrogen in the fuel.
Q.14

Sand used to stop the green sand from sticking to the pattern is termed as the __________ sand.

  • parting
  • synthetic
  • loam
  • dry
Q.15

Which of the following is not an ore of zinc?

  • Cerrusite
  • Franklinite
  • Calamine
  • Troosite
Q.16

Exposure to __________ accelarates the degradation of plastics.

  • ultraviolet radiation
  • high atmospheric temperature
  • high ambient temperature
  • damp atmosphere
Q.17

During brazing, if the fluxes are entrapped, it results in the

  • distortion of brazed joints.
  • cracking of joints.
  • presence of gas pockets.
  • corrosion.
Q.18

Which of the following alloying elements when added in steel does not improve its lachinability ?

  • Sulphur
  • Phosphorous
  • Copper
  • Lead
Q.19

Atomic __________ is a whole number for an element.

  • number
  • weight
  • radius
  • none of these
Q.20

Castability of aluminium is increased by the addition of __________ in it.

  • silicon
  • manganese
  • bismuth
  • lead
Q.21

The tensile strength of plastics ranges from __________ kg/mm2.

  • 10 to 50
  • 50 to 100
  • 0.01 to 0.1
  • 0.1 to 10
Q.22

With increase in pressure, the saturation temperature of steam

  • increases rapidly first and then slowly.
  • increases slowly first and then rapidly.
  • first increases and then decreases.
  • none of these.
Q.23

An example of a buffer solution is

  • mercury
  • lime water
  • human blood
  • concentrated nitric acid
Q.24

Consumable electrodes are used in the __________ welding.

  • gas
  • arc
  • thermit
  • resistance
Q.25

Which of the following is preferred for rivetting ?

  • Lap joint
  • Butt joint
  • Either (a) or (b)
  • Neither (a) nor (b)
Q.26

Brazing filler metal used for joining steel plates

  • melts below the melting points of base metals.
  • melts below 300°C.
  • is copper phosphorous alloy.
  • is copper.
Q.27

Pressure gauges are never connected directly to the live steam line; rather a loop or syphon is interposed as close as possible to the pressure gauge. This is done to

  • avoid the overheating of the tubes & bellows which operate them to minimise error and damage.
  • form a seal of water by steam condensate to fill the tube or bellows at the pressure being measured.
  • both 'a' & 'b'.
  • avoid the static head error introduced by steam entry.
Q.28

Steel produced from phosphatic iron is __________ in nature.

  • malleable
  • ductile
  • brittle
  • tough
Q.29

Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) ofmm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm.

  • 15
  • 25
  • 10
  • 30
Q.30

Largest application of laser welding is in __________ welding.

  • microspot
  • under water
  • precious metals
  • heavy structure
Q.31

Work required for compression of a gas contained in a cylinder iskJ. During compression, heat interaction ofkJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________ kJ.

  • +4000
  • -4000
  • 10000
  • - 10000
Q.32

__________ cycle is the most efficient thermodynamic cycle.

  • Diesel
  • Otto
  • Rankine
  • Carnot
Q.33

Addition of __________ to steel can not impart it high strength at elevated temperature.

  • nickel
  • magnesium
  • silicon
  • manganese
Q.34

Ceramic tips for the cutting tool are prepared from __________ powder.

  • carbon
  • silicon carbide
  • aluminium oxide
  • tungsten
Q.35

'Sterilised zone' around a hazardous chemical industry is an area with __________ km radius around it, in which the total population/inhabitants should be less thanpreferably in the upwind direction.

  • 0.5
  • 5
  • 25
  • 50
Q.36

A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C inseconds. The expected temperature of the ball after nextseconds may be about __________ °C.

  • 370
  • 340
  • 320
  • 300
Q.37

Magnesium is present in

  • haemoglobin
  • chlorophyll
  • hypo solution
  • none of these
Q.38

__________ wire is never used for making the heating element.

  • Nichrome
  • Kanthal
  • Invar
  • None of these
Q.39

Heating the hypoeutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called

  • tempering
  • hardening
  • annealing
  • normalising
Q.40

Fine grain size in metallic material will

  • increase the yield strength.
  • increase the creep strength.
  • increase the fatigue strength.
  • decrease the impact strength.
Q.41

Phosphorous is added to copper melt to

  • remove hydrogen.
  • deoxidise the metal.
  • improve fluidity.
  • reduce shrinkage.
Q.42

__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.

  • Vaneering
  • Galvanising
  • Electroplating
  • Calorising
Q.43

All modes of heat transfer i.e., conduction, convection & radiation occur in case of the

  • condensation of steam in a partial condenser.
  • boiler furnace.
  • insulated pipe car raying high pressure steam.
  • none of these.
Q.44

Which of the following is a neutral flux used in the pyrometallurgy of metal extraction?

  • Quartz
  • Flourspar
  • Dolomite
  • Manganese ore
Q.45

Highest cutting speed is achieved by the __________ tool material.

  • high speed steel
  • carbide
  • cast alloy
  • plain carbon steel
Q.46

Dew point of air indicates its

  • moisture content
  • dryness
  • latent heat
  • coolness
Q.47

Out of the following, __________ waves have the largest wavelength.

  • radio
  • light
  • X-ray
  • Gamma-ray
Q.48

Hard magnetic materials have high

  • coercive force.
  • residual magnetic induction.
  • both 'a' & 'b'.
  • neither 'a' nor 'b'.
Q.49

Grain hardness is measured by the __________ hardness testing method.

  • Knoop
  • Rockwell F
  • Shore sceleroscope
  • Vicker's
Q.50

The thermal efficiency of a heat engine giving an output of 4 KW with an input ofJoules/sec is __________ percent.

  • 40
  • 80
  • 10
  • 25
0 h : 0 m : 1 s