Mechanical Engineering MCQs

2075 MCQs  (Page 193 of 208)

Attempt Mechanical Engineering Mcqs Quiz
The following types of materials are usually the most ductile__________________?
A. Face-centred cubic lattice
B. Body-centred cubic lattice
C. Hexagonal close-packed lattice
D. All of the above
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In grey cast iron, carbon is present in the form of____________________?
A. Cementite
B. Free carbon
C. Flakes
D. Spheroids
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The unique property of cast iron is its high ___________________?
A. Malleability
B. Ductility
C. Surface finish
D. Damping characteristics
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The percentage of carbon in grey iron castings usually varies between __________________?
A. 0.5 to 1%
B. 1 – 2%
C. 2.5 to 4.5%
D. 5 – 7%
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For the allotropic forms of iron, the points of arrest are __________________?
A. The points where no further change oc-curs
B. Constant for all metals
C. The points where there is no further flow of metal
D. The points of discontinuity
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The crystal of alpha iron is ____________________?
A. Body centred cubic
B. Face centred cubic
C. Hexagonal close packed
D. Cubic structure
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A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?
A. Molecular change
B. Physical change
C. Allotropic change
D. Solidus change
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Ferromagnetic alpha iron exists in temperature range of________________?
A. Below 723°c
B. 770 – 910°c
C. 910-1440°c
D. 1400-1539°c
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The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?
A. 770°c
B. 910°c
C. 1050°c
D. Below recrystallisation temperature
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A material is known as allotropic or polymorphic if it __________________?
A. Has a fixed structure under all conditions
B. Exists in several crystal forms at different temperatures
C. Responds to heat treatment
D. Has its atoms distributed in a random pattern
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Word of the Day
27 Sep
Undesirable
not wanted or desirable because harmful, objectionable, or unpleasant.
غیر مطلوب، ناروا، نامناسب

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