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Hydraulics and Fluid Mechanics MCQs

291. The power transmitted through the pipe is maximum when the head lost due to friction is equal to

one-fourth of the total supply head

one-third of the total supply head

one-half of the total supply head

two-third of the total

✅ The correct answer is option B.

292. If the value of coefficient of discharge increases, the discharge through the orifice decreases.

TRUE

FALSE

✅ The correct answer is option B.

293. The quantity of a liquid flowing per second through a section of a pipe or a channel is called discharge and is measured in cumecs (m3/s).

TRUE

FALSE

✅ The correct answer is option A.

294. The discharge over a triangular notch is

inversely proportional to H3/2

directly proportional to H3/2

inversely proportional to H5/2

directly proportional

✅ The correct answer is option D.

295. The velocity at which the flow changes from laminar flow to turbulent flow is called

critical velocity

velocity of approach

sub-sonic velocity

super-sonic velocity

✅ The correct answer is option A.

296. Surface tension force is the product of surface tension per unit length and cross-sectional area of flow.

Correct

Incorrect

✅ The correct answer is option B.

297. The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.

equal to

one-half

three fourth

double

✅ The correct answer is option D.

298. When the flow in an open channel is gradually varied, the flow is said to be

steady uniform flow

steady non-uniform flow

unsteady uniform flow

unsteady non-uniform f

✅ The correct answer is option B.

299. The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.

less than

more than

✅ The correct answer is option B.

300. The absolute pressure is equal to

gauge pressure + atmospheric pressure

gauge pressure – atmospheric pressure

atmospheric pressure – gauge pressure

gauge pressure – vacuu

✅ The correct answer is option A.

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