6481. A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is
5
14.1
56.22
28.2
✅ The correct answer is option D.
Chemical Engineering
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6482. The simple pitot tube measures the __________ pressure.
Static
Dynamic
Total
None of these
✅ The correct answer is option C.
6483. Friction factor for a hydraulically smooth pipe at NRe = 2100 is f₁. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will
Increase
Decrease
Remain unchanged
Increase or decrease depending on the pipe material
✅ The correct answer is option A.
6484. The velocity profile for turbulent flow through a closed conduit is
Logarithmic
Parabolic
Hyperbolic
Linear
✅ The correct answer is option A.
6485. The speed of sound in an ideal gas varies as the
Temperature
Pressure
Density
None of these
✅ The correct answer is option A.
6486. Most commonly used joint in the underground pipe lines is the
Sleevejoint
Coupling
Flange
Expansion joint
✅ The correct answer is option A.
6487. A streamline is a line in flow field,
That is traced by all the fluid particles passing through a given point
Along which a fluid particle travels
Such that at every point on it, the velocity is tangential to it
None of these
✅ The correct answer is option C.
6488. Froude number is not a factor
For Reynolds number greater than 300
When there is no vortex formation
For unbaffled tank
None of these
✅ The correct answer is option B.
6489. In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes
Less than atmospheric pressure
More than liquid vapor pressure
Less than liquid vapor pressure
More than atmospheric pressure
✅ The correct answer is option C.
6490. Mach number is the ratio of the speed of the
Fluid to that of the light
Light to that of the fluid
Fluid to that of the sound
Sound to that of the fluid
✅ The correct answer is option C.