| 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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