Mechanical Engineering - Engineering Materials

16. 

The quenching of steel from the upper critical point results in a fine grained structure.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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17. 

An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

A. chromium
B. silicon
C. manganese
D. magnesium

Answer: Option C

Explanation:

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18. 

Which of the following has a fine gold colour and is used for imitation jewellery?

A. Silicon bronze
B. Aluminium bronze
C. Gun metal
D. Babbit metal

Answer: Option B

Explanation:

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19. 

When the steel is normalised, its

A. yield point increases
B. ductility decreases
C. ultimate tensile strength increases
D. all of these

Answer: Option D

Explanation:

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20. 

White cast iron has a high tensile strength and a low compressive strength.

A. Yes
B. No

Answer: Option B

Explanation:

White cast iron has a low tensile strength and a high compressive strength.

Source: https://en.wikipedia.org/wiki/Cast_iron#Table_of_comparative_qualities_of_cast_irons