Related Questions

Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding
A Glycerol
B Nitro cellulose
C Camphor
D None of these
Crystallisation of solids from a homogeneous solution is a/an __________ process.
A Exothermic
B Mildly endothermic
C Highly endothermic
D None of these
During crystallisation, formation of crystal can occur in __________ solution only.
A Saturated
B Supersaturated
C Undersaturated
D All of the above
Rate of crystallisation does not depend upon the
A Extent of supersaturation
B Turbulence within the solution
C Number and active surface area of the crystals
D None of these
The driving potential for the crystal growth during crystallisation is the __________ of the solution.
A Concentration
B Viscosity
C Super-saturation
D Density
In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is
A More
B Less
C Same
D More or less; depends on the nature of solution
The crystallisation of a solute from a solution may be done by
A Removal of pure solvent by evaporation
B Change of temperature thereby causing supersaturation
C Changing the nature of the system by the addition of a more soluble material
D All of the above
For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that
A governor A is more sensitive than governor B
B governor B is more sensitive than governor A
C both governors A and B are equally sensitive
D none of the mentioned
The value of starting capacitor of a fractional horse power motor will be
A 100 uF
B 200 uF
C 300 uF
D 400 uF
In D.C. machines fractional pitch winding is used
A To improve cooling
B To reduce copper losses
C To increase the generated e.m.f.
D To reduce the sparking

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