Related Questions

If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
A Higher than the surface of liquid
B The same as the surface of liquid
C Lower than the surface of liquid
D Unpredictable
Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant
A Humidity
B Velocity
C Temperature
D All of the above
The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.
A 0
B 100
C 50
D None of these
In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the __________ fibres.
A Viscose rayon
B Acrylic
C Polyvinyl acetate
D Saturated polyester
The value of coefficient of adhesion will be high when rails are
A Greased
B Wet
C Sprayed with oil
D Cleaned with sand
The normal value of adhesion friction is
A 0.12
B 0.25
C 0.40
D 0.75
Coefficient of adhesion reduces due to the presence of which of the following?
A Sand on rails
B Dew on rails
C Oil on the rails
D Both (B) and (C)
Coefficient of adhesion is
A High in case of D.C. traction than in the case of AC. traction
B Low in case of D.C. traction than in the case of AC. traction
C Equal in both Aand D.traction
D Any of the above
Due to which of the following coefficient of adhesion improves?
A Rust on the rails
B Dust on the rails
C Sand on the rails
D All of the above
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when
A Wheel base of axles is more
B Degree of curvature is more
C Both (A) and (B)
D None of the above

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