Chemical Engineering - Chemical Engineering Basics

41. 

During brazing, if the fluxes are entrapped, it results in the

A. distortion of brazed joints.
B. cracking of joints.
C. presence of gas pockets.
D. corrosion.

Answer: Option D

Explanation:

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42. 

Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm.

A. 15
B. 25
C. 10
D. 30

Answer: Option B

Explanation:

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43. 

All modes of heat transfer i.e., conduction, convection & radiation occur in case of the

A. condensation of steam in a partial condenser.
B. boiler furnace.
C. insulated pipe car raying high pressure steam.
D. none of these.

Answer: Option B

Explanation:

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44. 

The standard instrument used for calibrating the load applied by universal testing machine is called

A. extensometer
B. spring balace
C. dynamometer
D. none of these

Answer: Option D

Explanation:

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45. 

The reductant used in the extraction of magnesium from calcined dolomite via Pidgeon's process is

A. pure carbon
B. pure silicon
C. ferro silicon
D. ferro manganese

Answer: Option C

Explanation:

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