Related Questions
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Unbreakable crockeries are made from __________ polymers.
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With increase in impurities in metals, their corrosion resistances
D. May increase or decrease; depending on the type of metal
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4
Calorific value of __________ are almost same.
A. Lignite & anthracite coal
D. Coal gas & natural gas
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4
The joint for soldering is supported by binding wire made of
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4
Internal energy of a gas obeying Van-Der- Waals equation of state, [p + (a/v2)] (V - b) = RT, depends upon its
A. Pressure & temperature
B. Pressure & specific volume
C. Temperature & specific volume
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4
Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.
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In case of a, centrifugal pump, the ratio h1/h2 is termed as the __________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller).
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Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that
A. Pure oxygen has been used for combustion
B. Nitrogen percentage in the fuel is very high
C. Excess air has been used for combustion
D. Hydrogen is not present in the fuel
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4
Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.
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4
Addition of silicon to cast iron
A. Promotes graphite module formation
B. Improves its ductility
C. Does not promote graphite flakes formation
D. Increases the fluidity of molten metal
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The process of removal of scale formed during hot rolling of steel is termed as
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Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process?
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Which of the following is an example of cathodic protection of metals against corrosion?
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Gross national product (GNP) means the total value of __________ in a country.
C. Earning of the citizens
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4
Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode
A. Occurs higher in the electro-chemical series of metals
B. Is exemplified by magnesium plate
C. Is much cheaper than the cathodic base material to be guarded against corrosion
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4
An atom bomb works on the principle of
C. Both the nuclear fission & fusion
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4
Pick out the wrong statement.
A. Seam welding, projection welding & spot welding are the classification of electrical resistance welding
B. Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)
C. In spot welding, two pieces to be joined are overlapped and placed between two electrodes
D. Mild steel sheet cannot be spot welded
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'Cryogenics' is concerned with the generation & use of low temperature in the range of
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The following type of bonding is strongly directional in solids.
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Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.
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Which of the following materials has the maximum shrinkage allowance?
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Unit of viscosity in CGS system is
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__________ is used as a material of construction for the blade of power saw.
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Large scale fire on fuel gas line is normally extinguished by
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Which one of the following is incombustible?
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For the irreversible reaction, Ca+ 2C = Ca C2 , Δ H°298 = - 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be
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4
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type
A. Parallel flow with equal heat capacities
B. Counter flow with equal heat capacities
C. Counter flow with unequal heat capacities
D. Parallel flow with unequal heat capacities
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4
The value of for air & most common gases can be safely assumed to be
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Matte smelting is used in the extraction of
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Identify the correct statement.
A. Sphlerite is zinc oxide
B. The first law of the thermodynamics is stated as δE = δQ - δW
C. Lead can be produced in a blast furnace
D. T. ferrooxidans is a fungus that can be used for leaching chalcopyrite