261. If a pitot tube is placed with its nose upstream, downstream or sideways, the reading will be the same in every case.
TRUE
FALSE
✅ The correct answer is option B.
Hydraulics and Fluid Mechanics MCQs
262. A flow in which __________ force is dominating over the viscosity is called turbulent flow.
elastic
surface tension
viscous
inertia
✅ The correct answer is option D.
263. When the Mach number is between __________ the flow is called super-sonic flow.
1 and 2.5
2.5 and 4
4 and 6
1 and 6
✅ The correct answer is option D.
264. A vessel of 4 m3 contains an oil which weighs 30 kN. The specific weight of the oil is
4.5 kN/m3
6 kN/m3
7.5 kN/m3
10 kN/m3
✅ The correct answer is option C.
265. With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will
decrease
increase
remain unchanged
depend upon the charac
✅ The correct answer is option A.
266. A manometer can be used to measure vacuum pressures.
Agree
disagree
✅ The correct answer is option A.
267. According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)
Cd(L – nH)2gH
Cd(L – 0.1nH)2gH3/2
Cd(L – nH)2gH2
Cd(L – 0.2nH)2gH5/2
✅ The correct answer is option B.
268. A flow whose streamline is represented by a curve, is called
one-dimensional flow
two-dimensional flow
three-dimensional flow
four-dimensional flow
✅ The correct answer is option B.
269. In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be
double
four times
eight times
sixteen times
✅ The correct answer is option D.
270. A flow in which the viscosity of fluid is dominating over the inertia force is called
steady flow
unsteady flow
laminar flow
turbulent flow
✅ The correct answer is option C.