Change in direction of flow
Change in total energy
Change in pressure
Non uniform direction of velocities at inlet & outlet sections
✅ The correct answer is option D.
Fluid Mechanics MCQs
502. Euler’s equation of motion states, that at every point, the
Fluid momentum is constant
Force per unit mass equals acceleration
Rate of mass outflow is equal to the rate of mass inflow
None of these
✅ The correct answer is option B.
503. Power number is the ratio of
Drag stress to inertial stress
Inertial stress to drag stress
Inertial stress to gravitational stress
Gravitational stress to drag stress
✅ The correct answer is option A.
504. The percentage slip in a reciprocating pump set is given by the % of (where, Q₁ = actual discharge Q₂ = theoretical discharge)
Q₁/Q₂
Q₂/Q₁
(Q₂ – Q₁)/Q₁
(Q₂ – Q₁)/Q₂
✅ The correct answer is option D.
505. The value of critical Reynolds number for pipe flow is
1300
10,000
100,000
None of these
✅ The correct answer is option A.
506. Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter.
5
50
500
1000
✅ The correct answer is option B.
507. Major loss in sudden contraction in pipe flow is due to
Boundary friction
Flow contraction
Expansion of flow after sudden contraction
None of these
✅ The correct answer is option B.
508. For ideally incompressible fluid, the Mach number will be
1.5
1
0
5
✅ The correct answer is option B.
509. With increase in the schedule number of a pipe of a particular nominal size, the
Wall thickness also increases
I.of the pipe decreases
O.of the pipe remains constant
All of the above
✅ The correct answer is option D.
510. Gear pump
Is a positive displacement pump
Is a centrifugal pump
Is a non-positive displacement pump
Can be started with delivery valve closed
✅ The correct answer is option A.