31
Which is not a dimensionless parameter?
1
Reynolds number
2
Froude number
3
Atomic number
4
Mach number
32
The concept of boundary layer that provides important links between ideal-fluid flow and real-fluid flow
1
Reynolds
2
Prandtl
3
Mach
4
Hagen
33
As per classification of materials, 'fiber glass' may be classified under
1
metals
2
ceramics
3
composites
4
polymers
34
The volume of atoms in a unit cell divided by total volume of the unit cell is known as
1
atomic number
2
atomic packing factor
3
coordination number
4
crystal index
Answer: atomic packing factor
35
Which among the following is not a carbon polymorph?
1
Diamond
2
Pearl
3
Graphite
4
Fullerene
36
Perspex is was given by
1
Aciylic sheet
2
an elastomer
3
an alloy of tin and lead
4
an aluminium foil clad with bakelite
View Answer
37
Atmospheric corrosion of metals results from their
1
slow oxidation
2
fast oxidation
3
fast hydration
4
slow hydration
View Answer
38
Boiler feed-water is treated to prevent
1
scaling and corrosion
2
foaming and priming
3
Both (A) and (B)
4
Neither (A) nor (B)
View Answer
39
Which of the following is not a renewable energy?
1
Solar energy
2
Wind energy
3
Nuclear energy
4
Geothermal energy
View Answer
40
Glass is corroded by
1
fluorine (dry or wet)
2
H2S04
3
H3P04
4
None of the above
View Answer
Answer: fluorine (dry or wet)
41
Which of the following produces maximum pressure difference for transportation of gases?
1
Vacuum pump
2
Blower
3
Fan
4
Compressor
View Answer
42
The number of gram equivalent of solute dissolved in one litre of solution is called its
1
normality
2
molarity
3
molality
4
None of the above
View Answer
43
Rubber-lined pumps can be used to pump
1
caustic soda
2
chlorinated brine
3
hypochloric acid
4
All of the above
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44
In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by
1
cuprous chloride
2
potassium hydroxide
3
alkaline pyrogallol solution
4
Non of the above
View Answer
45
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of
1
less air for combustion
2
correct amount of air for combustion
3
too much air for combustion
4
pulverised coal in boilers
View Answer
Answer: too much air for combustion
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