Mechanical Engineering - Engineering Materials

41. 

Pearlite consists of

A. 13% carbon and 87% ferrite
B. 13% cementite and 87% ferrite
C. 13% ferrite and 87% cementite
D. 6.67% carbon and 93.33% iron

Answer: Option B

Explanation:

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42. 

Incoloy, Hastelloy and Vitallium are __________ temperature alloys.

A. high
B. low

Answer: Option A

Explanation:

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43. 

Quenching is not necessary when hardening is done by

A. case hardening
B. flame hardening
C. nitriding
D. any one of these

Answer: Option C

Explanation:

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44. 

The iron ore in the charge of blast furnace acts as an iron bearing mineral.

A. True
B. False

Answer: Option A

Explanation:

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45. 

Beryllium bronze has

A. high yield point
B. high fatigue limit
C. both (a) and (b)
D. none of these

Answer: Option C

Explanation:

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