6151. In a stabilised soap bubble, pressure inside it compared to external pressure is
More
Less
Same
Unpredictable
✅ The correct answer is option A.
Chemical Engineering
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6152. A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump
Develops a lower head
Capacity is reduced
Requires more power
All of the above
✅ The correct answer is option D.
6153. The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is
< 1
1
> 1
2
✅ The correct answer is option A.
6154. Equivalent length of a pipe fitting is
Dependent on Reynolds number
Independent of Reynolds number
Dependent on the length of the pipe
None of these
✅ The correct answer is option A.
6155. For steady ideal fluid flow, the Bernoulli’s equation states that the
Velocity is constant along a stream line
Energy is constant throughout the fluid
Energy is constant along a stream line, but may vary across stream lines
None of these
✅ The correct answer is option C.
6156. The ratio of maximum to average velocity in case of streamline flow between parallel plates is
1
1.5
2
2.5
✅ The correct answer is option B.
6157. The time of oscillation of a floating body is
Longer, if metacentric height is increased
Independent of the metacentric height
Dependent on the buoyant forces only
None of these
✅ The correct answer is option D.
6158. Cavitation in a centrifugal pump can be avoided by keeping the
Inlet pressure high
Outlet pressure low
Inlet pressure low
Outlet pressure high
✅ The correct answer is option A.
6159. Lower BWG means __________ of the tube.
Lower thickness
Lower cross-section
Outer diameter
Inner diameter
✅ The correct answer is option B.
6160. Pick out the correct statement pertaining to transition/ entrance length in fluid flow.
The length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is called the transition length
Transition length for laminar flow of Newtonion fluids in a pipe of diameter ‘d’ is equal to 0.05. D.NRe
Transition length for turbulent flow of Newtonion fluids in a smooth pipe of diameter ‘d’ is equal to 50 D
All of the above
✅ The correct answer is option D.