Mechanical Engineering - Engineering Materials

11. 

The ability of a material to absorb energy in the plastic range is called

A. resilience
B. creep
C. fatigue strength
D. toughness

Answer: Option A

Explanation:

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12. 

Brass is an alloy of

A. copper and zinc
B. copper and tin
C. copper, tin and zinc
D. none of these

Answer: Option A

Explanation:

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13. 

A material is said to be allotropic, if it has

A. fixed structure at all temperatures
B. atoms distributed in random pattern
C. different crystal structures at different temperatures
D. any one of the above

Answer: Option C

Explanation:

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14. 

Closed packed hexagonal space lattice is found in

A. zinc, magnesium, cobalt, cadmium, antimony and bismuth
B. gamma-iron, aluminium, copper, lead, silver and nickel
C. alpha-iron, tungsten, chromium and molybdenum
D. none of the above

Answer: Option A

Explanation:

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15. 

The hardness and tensile strength in austenitic stainless steel can be increased by

A. hardening and cold working
B. normalising
C. martempering
D. full annealing

Answer: Option A

Explanation:

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