Civil Engineering : Fluid Machines QUESTIONS AND ANSWERS :: part3 : 16 to 20
Following Civil Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
16.For laminar flow in a pipe of circular cross-section, the Darcy's friction factor f is |
| directly proportional to Reynolds number and independent of pipe wall roughness |
| directly proportional to pipe wall roughness and independent of Reynolds number |
| inversely proportional to Reynolds number and indpendent of pipe wall roughness |
| inversely proportional to Reynolds number and directly proportional to pipe wall roughness |
17.In which of the following the friction drag is generally larger than pressure drag? |
| a circular disc or plate held normal to flow |
| a sphere |
| a cylinder |
| an airfoil |
18.Stanton diagram is a |
| log-log plot of friction factor against Reynolds number |
| log-log plot of relative roughness against Reynolds number |
| semi-log plot of friction factor against Reynolds number |
| semi-log plot of friction factor against relative roughness |
19.If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is |
| less than 1 |
| between 1 and 100 |
| 160 |
| 200 |
20.Which of the following has highest coefficient of discharge ? |
| sharp edged orifice |
| venturimeter |
| Borda's mouthpiece running full |
| CipoUetti weir |
More Fluid Machines QUESTIONS AND ANSWERS available in next pages
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