Chemical Engineering - Chemical Engineering Basics

21. 

In TIG welding, thoriated tungsten electrodes are used, because it

A. has higher current carraying capacity.
B. has better electron emissivity.
C. is stronger than ordinary tungsten.
D. is easy to prepare.

Answer: Option B

Explanation:

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22. 

Vernier calipers can not be used to measure the

A. I.D. & O.D. of the shaft.
B. thickness of parts.
C. depth of holes.
D. clearance between two mating surfaces.

Answer: Option D

Explanation:

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23. 

Which of the following is not the commercial name of polymethyl-methacrylate (PMMA) ?

A. Styrofoam
B. Lucite
C. Perspex
D. Plexiglass

Answer: Option A

Explanation:

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24. 

On being hit with a hammer, __________ will readily fracture.

A. brass
B. mild steel
C. cast iron
D. lead

Answer: Option C

Explanation:

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25. 

Which of the following does not discharge the dust collected as a dry solid ?

A. Electrostatic precipitator
B. Wet scrubber
C. Bag filter
D. Gravity settling chamber

Answer: Option B

Explanation:

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