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.Management Sciences
Category: Engineering Materials
Which of the following has highest specific strength of all structural materials__________________?
A. magnesium alloys
B. titanium alloys
C. chromium alloys
D. magnetic steel alloys
E. none of the above
In compression, a prism of brittle material will break________________?
A. by forming a bulge (l>) by shearing along oblique plane
B. in direction perpendicular to application of load
C. by crushing into thousands of pieces
D. none of the above
A specimen of aluminium metal when observed under microscope shows __________________?
A. B.C.C. crystalline structure
B. F.C.C. crystal structure
C. H.C.P. structure
D. a complex cubic structure
E. orthorhombic crystalline structure
Depth of hardness of steel is increased by addition of_________________?
A. nickel
B. chromium
C. tungsten
D. vanadium
E. ell of the above
The following element can’t impart high strength at elevated temperature__________________?
A. manganese
B. magnesium
C. nickel
D. silicon
E. none of the above
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio _____________________?
A. 50 : 20 : 20 : 10
B. 40 : 30 : 20 : 10
C. 50 : 20 : 10 : 20
D. 30 : 20 : 30 : 20
E. 50 : 10 : 20 : 20
The crystal structure of gamma iron is_________________?
A. body centred cubic
B. face centred cubic
C. hexagonal close packed
D. cubic structure
E. orthorhombic crystal
The number of electrons in 1 cm3 of metal would be of the order of_______________?
A. 1010
B. TO16
C. 1022
D. 1040
E. 1052
An important property of high silicon (12 – 18%) cast iron is the high__________________?
A. tenacity
B. brittleness
C. plasticity
D. corrosion resistance
E. hardness
Slow plastic defomiation of metals under a constant stress is known as________________?
A. creep
B. fatigue
C. endurance
D. plastic deformation
E. non-plastic deformation
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