Important Question Mechnical Engineering
1. The property of material ,which enables it to withstand bending , without fracture , is know as
(a) Mechanical strength
(b) Stiffness
(c ) flexural rigidity
(d) Ductility
Ans. C
2. Which ingredient is responsible for corrosion resistant capability in Stainless Steel ?
(a) Iron
(b) chromium
(c ) Zinc
(d) Sulphur
Ans. B
3. Babbit meta is an alloy of which one of the following ?
(a) Lead and Tin
(b) Lead and Magnesium
(c ) Tin and Bismuth
(d) None of the above
Ans. A
4. When mechanical properties of a material remain same in all directions at each point, such a material is called
(a) Isotropic
(b) Homogeneous
(c ) Orthotropic
(d ) Anisotropic
Ans. A
5. Bronze contains
(a) Cu % and Zn 30%
(b) Cu 90% and Zn10%
(c )Cu 75% and Zn 25%
(d) None of these
Ans. B
6. If a material expands freely due to heating , it will develop :
(a) Thermal stresses
(b) Tensile stresses
(c ) Compressive stresses
(d ) No stresses
Ans. D
7. Which one of the following has the highest value of specific stiffness ?
(a) Steel
(b) Aluminium
(c ) Fibre glass
(d) Carbon fibre composite
Ans. A
8. Which element makes stainless steel corrosion resistant ?
(a) Vanadium
(b) Chromium
(c ) Carbon
(d) Sulphur
Ans. B
9. The process of formation of new grains on heating metals is called
(a) Recrystallization
(b) Oxidation
(C )Microstructure
(d) Hardening
Ans. A
10. Which of the following has maximum ductility ?
(a) Copper
(b) Mild Steel
(c ) Cast Iron
(d ) 18-4-1 Steel
Ans. A