Chemical Engineering - Chemical Engineering Basics

41. 

Dislocation cross-slip is difficult in those materials, which have

A. large number of slip systems.
B. high work hardening rate.
C. coarse grain size.
D. low stacking fault energy.

Answer: Option D

Explanation:

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42. 

Shrinkage allowance on pattern is provided to compensate for shrinkage when the

A. metal changes from liquid state to solid state at freezing temperature.
B. solid phase temperature drops from freezing temperature to the room temperature.
C. liquid metal temperature drops from pouring temperature to room temperature.
D. liquid metal temperature drops from pouring temperature to freezing temperature.

Answer: Option B

Explanation:

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43. 

Spark plug is provided in a/an

A. engine having carburettor.
B. diesel engine.
C. compression ignition engine.
D. both(b) & (c).

Answer: Option A

Explanation:

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44. 

Oxyacetylene reducing flame is used while carrying out welding on

A. alloy steel
B. grey cast iron
C. mild steel
D. high carbon steel

Answer: Option C

Explanation:

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45. 

Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

A. Re0.5, Re0.8
B. Re0.8, Re-0.5
C. Re0.8, Re0.5
D. Re-0.8, Re0.5

Answer: Option C

Explanation:

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