271. The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number.
Yes
No
✅ The correct answer is option A.
Hydraulics and Fluid Mechanics MCQs
272. The hydraulic mean depth for a circular pipe of diameter (d) is
d/6
d/4
d/2
d
✅ The correct answer is option B.
273. The pressure of liquid at throat in a venturimeter is __________ than that at inlet.
higher
lower
✅ The correct answer is option B.
274. A flow is called super-sonic if the
velocity of flow is very high
discharge is difficult to measure
Mach number is between 1and 6
none of these
✅ The correct answer is option C.
276. When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as
narrow-crested weir
broad-crested weir
Ogee weir
submerged weir
✅ The correct answer is option D.
277. The loss of pressure head in case of laminar flow is proportional to
velocity
(velocity)2
(velocity)3
(velocity)4
✅ The correct answer is option A.
278. The critical depth meter is used to measure
velocity of flow in an open channel
depth of flow in an open channel
hydraulic jump
depth of channel
✅ The correct answer is option C.
279. In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be
running full
running free
partially running full
partially running free
✅ The correct answer is option B.
280. The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel)
✅ The correct answer is option B.