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Mechanical Engineering Objective Questions { Machine Design }



1. In bending of a beam, transverse shearing stresses are induced between the elements or fibres, if the bending moment is
A.Constant
B.Varies
C.Increases
D.Decreases

2. A hot short metal is
A.Brittle when cold
B.Brittle when hot
C.Brittle under all conditions
D.Ductile at high temperature

3. Guest's theory of failure is applicable for following type of materials
A.Brittle
B.Ductile
C.Elastic
D.Plastic

4. Rankine's theory of failure is applicable for following type of materials
A.Brittle
B.Ductile
C.Elastic
D.Plastic

5. Tensile strength of a mild steel specimen can be roughly predicted from following hardness test
A.Brinell
B.Rockwell
C.Vicker
D.Shore's sceleroscope

6. Resilience of a material is important, when it is subjected to
A.Combined loading
B.Shock loading
C.Thermal stresses
D.Wear and tear

7. In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by
A.Decreasing the cross-section area of bar
B.Increasing the cross-section area of bar
C.Remain unaffected with cross-section area
D.Would depend upon other factors

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