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.
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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
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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
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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.
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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
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