Which of the following mechanical properties of a material is most structure insensitive?
A. Modulus of elasticity (young
B. Toughness
C. Percentage reduction of area
D. Tensile strength
Select an option to see the answer and solution.
__________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working.
A. Solid solution hardening
B. Screw dislocation
C. Strain ageing
D. Twinning
Select an option to see the answer and solution.
Muntz metal is a/an alloys of
A. Magnesium & tin
B. Ferrous material
C. Lead & tin
D. Copper & zinc
Select an option to see the answer and solution.
Caustic soda is transported in __________ lined containers.
A. Glass
B. Nickel
C. Neoprene
D. Either B or C
Select an option to see the answer and solution.
Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
A. Acidic refractory
B. Rubber
C. Karbate
D. Lead or acid-proof bricks
Select an option to see the answer and solution.
Which of the following is an alloy of nickel and copper?
A. Hastelloy
B. Duriron
C. Monel
D. Inconel
Select an option to see the answer and solution.
Bog iron used for the adsorption of H2 S from coke oven gas is
A. An intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide)
B. Iron impregnated with resin (usually bakelite)
C. Carbon free iron
D. None of these
Select an option to see the answer and solution.
Addition of tungsten to steel imparts
A. Magnetic properties
B. Cutting hardness
C. Corrosion resistance
D. Ductility
Select an option to see the answer and solution.
With increase in the carbon percentage in the steel, its
A. Hardness increases
B. Ductility reduces
C. Tensile strength increases
D. All of the above
Select an option to see the answer and solution.
A material is able to retain the deformation permanently by virtue of its
A. Elasticity
B. Plasticity
C. Ductility
D. Malleability
Select an option to see the answer and solution.
Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its
A. Corrosion resistance
B. Tensile strength
C. Machinability
D. Compressive strength
Select an option to see the answer and solution.
Maximum permissible sulphur content in steel is __________ percent.
A. 0.015
B. 0.055
C. 0.505
D. 0.805
Select an option to see the answer and solution.
Carbon content in steel is __________ percent.
A. 0.1-2
B. 4-6
C. 2-4
D. 0.001-0.01
Select an option to see the answer and solution.
Carbon content in plain carbon steel is __________ percent.
A. 0.1 to 0.15
B. 0.35 to 0.45
C. 0.65 to 0.80
D. 0.85 to 1.2
Select an option to see the answer and solution.
Constantan used in thermocouples is an alloy of
A. Iron & copper
B. Copper & aluminium
C. Lead & tin
D. None of these
Select an option to see the answer and solution.
__________ does not contain tin as an alloying material.
A. Brass
B. Pewter
C. Solder
D. Babbit metal
Select an option to see the answer and solution.
Which of the following finds the least commercial use?
A. Pure iron
B. High silicon iron
C. Low carbon steel
D. High carbon steel
Select an option to see the answer and solution.
Pick out the wrong statement.
A. Tin can be readily and very easily drawn into very fine wire
B. Tin can be severely cold worked without the necessity of annealing due to its low recrystallisation temperature
C. Tin exists in two allotropic forms
D. The predominant use of tin is in the form of coating for steel & copper alloys
Select an option to see the answer and solution.
A hardened steel essentially contains
A. Sorbite
B. Troostite
C. Martensite
D. None of these
Select an option to see the answer and solution.
Diamagnetic materials are magnetised
A. Strongly
B. Only slightly
C. With eddy currents only
D. In a direction opposite to that of the applied field
Select an option to see the answer and solution.