E-PolyLearning

31. Friction factor for fluid flow in pipe does not depend upon the
a. pipe length.
b. pipe roughness.
c. fluid density & viscosity.
d. mass flow rate of fluid.
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Answer: (a).pipe length.

32. All of the following alloying elements of steel increases hardness but sacrifice ductility, except
a. nickel
b. vanadium
c. molybdenum
d. chromium
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Answer: (a).nickel

33. The following type of bonding is strongly directional in solids.
a. Vander Waal's
b. Ionic
c. Metallic
d. Covalant
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Answer: (d).Covalant

34. Fog is an example of colloidal system of
a. solid dispersed in gas.
b. solid dispersed in liquid.
c. liquid dispersed in gas.
d. gas dispersed in liquid.
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Answer: (c).liquid dispersed in gas.

35. Chromium molybdenum steel can not be welded using __________ welding.
a. thermit
b. electrical resistance
c. oxy-acetylene
d. any of these
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Answer: (b).electrical resistance