Chemical Engineering - Chemical Engineering Basics

41.
In 18-4-1 high speed steel, 18, 4 & 1 respectively denote the percentage of
chromium, tungsten & vanadium.
tungsten, chromium & vanadium.
tungsten, vanadium & chromium.
tungsten, chromium & molybdenum.
Answer: Option
Explanation:
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42.
Role of a "collector" in froth floatation is to
form a water repelling film on the mineral surface.
create and stabilise the froth.
act as a surface.
collect the minerals according to their specific gravity.
Answer: Option
Explanation:
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43.
For the running of power generating turbines, the steam used should be
wet
superheated
at ordinary pressure
none of these
Answer: Option
Explanation:
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44.
Creep consideration is the most important in case of the
blades of gas turbines.
steam engine flywheel.
cast iron pipes.
cycle chains.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

45.
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10-16 m2 . S-1 and it is 1.94 x 10-14 m2 S-1 at 1200 K. The activation energy (in k. J.mole-1 ) for the diffusion of Ni in Cu is
130
180
230
250
Answer: Option
Explanation:
No answer description is available. Let's discuss.