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11 .
The normal stress is the same in all directions at a point in a fluid, when the fluid is
| A. | non-viscous. |
| B. | incompressible |
| C. | both (a) and (b). |
| D. | having no motion of one fluid layer relative to the other. |
12 .
Head developed by a centrifugal pump depends on its
| A. | speed |
| B. | impeller diameter |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
13 .
Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum
| A. | flow rate |
| B. | mean velocity |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
14 .
The head loss in turbulent flow in a pipe varies
| A. | as velocity |
| B. | as (velocity)2 |
| C. | inversely as the square of diameter |
| D. | inversely as the velocity |
15 .
Most commonly used joint in the underground pipe lines is the
| A. | sleevejoint |
| B. | coupling |
| C. | flange |
| D. | expansion joint |
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