There are 150 gearwheels in a box, out of which 112 are within the required tolerance, 21 are below and rest are above the required tolerance. If the selection is done without replacement, the combined probability of randomly selecting a gearwheel below the tolerance and then a second one above the tolerance is
A. 0.016
B. 0.032
C. 0.492
D. 0.984
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A body which absorbs all incident thermal radiation.
A. Black body
B. colored body
C. gray body
D. None of these
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With decrease in radius of curvature in bending, the strain will
A. decrease
B. increase
C. remains constant
D. none of these
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An isotropic metal matrix composite related to
A. Continuous fiber
B. Discontinuous fiber
C. Both A and B
D. None of these
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Which of following is correct about hardness
A. Cementite > Martensite > Lower bainite > Upper bainite > Fine pearlite > Coarse pearlite > Ferrite
B. Cementite > Upper bainite > Martensite > Lower bainite > Fine pearlite > Ferrite > Coarse pearlite
C. Cementite > Ferrite > Martensite > Lower bainite > Upper bainite > Coarse pearlite > Fine pearlite
D. None of these
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The process by which screw dislocation may leave slip plane
A. climb
B. cross-slip
C. both A and B
D. none of these
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The process of plastically deforming metals/alloys by passing it between rolls is known as
A. Forging
B. Rolling
C. Extrusion
D. drawing
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Why is nitriding not used for plain carbon steels?
A. Formation of oxides
B. Formation of cracks
C. Formation of iron nitrides
D. Formation of spots
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The basal plane and chief slip direction for Hexagonal closed packed structure is
A. (0 0 0 1) & <1 1 2 0>
B. (0 2 1 1) & <1 1 -2 0>
C. (0 0 0 1) & <1 0 0 0>
D. (1 1 2 2) & <1 1 -2 1>
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The molecular mass of a polymer chain divided by the molecular mass of its mer
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Which of the following is a property of ceramics?
A. Low strength
B. Low melting point
C. Resistant to corrosion
D. Bad insulation
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Negative climb of dislocation means
A. climb down
B. addition of a plane of atoms
C. both A and B
D. removal of a plane of atoms
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Thin section having thickness lesser than 6mm & width greater than 600mm is called
A. plate
B. sheet
C. strip
D. slab
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Which of the flammable material used under Class C
A. Switch box
B. Fuse boxes
C. Electrical circuit's board
D. All of these
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Cooling of hypoeutectoid steels in done is furnace by decreasing the temperature to at least . . . . . . . . below the A1 line.
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Symmetrical hollow parts of circular crosssection are made by
A. Spinning
B. Drawing
C. Piercing
D. yielding
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From annihilation of dislocations, total energy of system . . . . . . . .
A. increases
B. decreases
C. remains constant
D. first increases and then decreases
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For wet wire drawing . . . . . . . . lubricants are used
A. Mulsifiable oil
B. Soap
C. Both A and B
D. none of these
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Which one of the following plots relating shear stress with strain rate represents Newtonian behaviour of a fluid?
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The capacity of being welded into inseparable joints having specified properties such as definite weld strength, proper structure, etc. is called
A. hardenability
B. Weldability
C. Flowability
D. None of these
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