361. Which of the following is an example of laminar flow?
Under ground flow
Flow past tiny bodies
Flow of oil in measuring instruments
all of these
✅ The correct answer is option D.
Hydraulics and Fluid Mechanics MCQs
363. The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)
Cd x b2gH
Cd x b2g x H
Cd x b2g x H3/2
Cd x b2g x H2
✅ The correct answer is option C.
364. The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)
Cd 2g x H
Cd 2g x H3/2
Cd 2g x H2
Cd 2g x H5/2
✅ The correct answer is option D.
365. The weight per unit volume of a liquid at a standard temperature and pressure is called
specific weight
mass density
specific gravity
none of these
✅ The correct answer is option A.
366. A manometer is used to measure
low pressure
moderate pressure
high pressure
atomospheric pressure
✅ The correct answer is option C.
368. The total energy line lies over the hydraulic gradient line by an amount equal to the
pressure head
velocity head
pressure head + velocity head
pressure head – velocity head
✅ The correct answer is option B.
369. The pressure less than atmospheric pressure is known as
suction pressure
vacuum pressure
negative gauge pressure
all of these
✅ The correct answer is option D.
370. Coefficient of contraction is the ratio of
actual velocity of jet at vena contracta to the theoretical velocity
loss of head in the orifice to the head of water available at the exit of the orifice
actual discharge through an orifice to the theoretical discharge
area of jet at vena contracta to the area of orifice
✅ The correct answer is option D.