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L.D. (Linz-Donawitz) converter is used in the production of
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Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA)?
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__________ temperature remains constant during adiabatic saturation process of unsaturated air.
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__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.
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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
There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.
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The most suitable material of construction for a sewer to carry sewage under high pressure is
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The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as
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Fire refining process is employed in case of
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The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is
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4
Pick out the wrong statement.
A. Copper is the metal having the highest electronic conductivity
B. Hardenability & Weldability of metals are inversely related
C. Covalent bonding formed by sharing of electrons is present in all semi-conductor materials
D. Glass transition temperature applies to 'polymers' but not to 'glasses'
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4
In __________ process, there is an increase in entropy with no degradation of energy.
B. Isochoric heat addition
D. Isobaric heat addition
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The material used for coating the welding electrode is termed as the
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Solute atoms which cause yield point phenomenon in mild steel are/is
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Tempering of a material does not improve its
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Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
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Which of the following materials has the poorest electrical conductivity?
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Steel balls are manufactured by
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The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.
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4
Magnesium is present in
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The specific gravity of coal depends mainly on its __________ content.
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If the head is doubled in & centrifugal pump, the power required will increase in the ratio of
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4
Plastics as a material of construction suffer from the drawback of low
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The following thermocouple may be used for measuring temperature upto 1873°K.
C. Platinum-platinum rhodium
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Copper deposits are found in India at the following location:
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Milk is fat dispersed in water. It is an example of
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Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
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__________ fluid force is not considered in the Navier-Stokes equation.
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Which of the following is an acidic constituent of B.F. slag?
A.
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Oxygen cylinders used for autogenous (cutting/welding) purposes are
A. Seamless & made of steel
B. Heat treated before use
D. Welded steel cylinders