Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Water at 20? C flows in a piping system at a low velocity. At what pressure, in kPa absolute, will cavitation result?
a. 10.6
b. 2.45
c. 5.67
d. 20.1
e. 35.6
Q. An ideal flow of any fluid must fulfil the following
a. Boundary layer theory
b. Newton's law of viscosity
c. Newton's law of motion
d. Pascals law
e. Continuity equation
Q. In isentropic flow, the temperature
a. Is a function of Mach number only
b. Is independent of Mach number
c. Cannot drop and then increase again downstream
d. Cannot exceed the reservoir temperature
e. Remains constant in a duct flow
Q. The density of air at 10?C and 1 Mpa abs in SI units is
a. 12.31
b. 1.231
c. 118.4
d. 65
e. None of the above
Q. The turbulent flow is hydraulically smooth if the ratio height of roughness projection/the thickness of laminar sub-layer is less than
a. 0.8
b. 1
c. 0.75
d. 0.5
e. 0.25
Q. Mixed flow turbine are
a. Radial inward flow type
b. Radial outward flow type
c. Partly rdial partly axial
d. Parallel flow type
e. None of the above
Q. The part of a reservoir water which can be utilized for pwer production or other purposes, is known as
a. Main storage
b. Power storage
c. Live storage
d. Useful storage
e. Dead storage
Q. The distance r from the centre of a tube of radius r0 where the average velocity occurs in laminar flow is
a. 0.5 r0
b. 0.707 r0
c. 0.8 r0
d. r0
e. None of the above
Q. The best draulic channel cross-section is the one which has
a. maximum area for a given flow
b. maximum wetted perimeter
c. minimum wetted perimeter
d. least cost
Q. An electric overhead crane is specified by
a. Capacity in tons
b. Span
c. Travel
d. All of the above
e. None of the above
Q. Which type of pump is different from the others?
a. Duplex pump
b. Piston pump
c. Plunger pump
d. Simplex pump
e. Centrifugal pump
Q. The specific speed of a pump is defined as the speed of a pump
a. Of unit size with unit discharge at unit head
b. Of such size that it requires unit power for unit head
c. Of such size that it delivers unit discharge at unit head
d. Of such size that it delivers unit discharge at unit power
e. None of these answers
Q. If one of the walls moves in the direction of flow with uniform velocity while the other wall is stationary, then the resulting flow between parallel walls is called
a. Plug flow
c. Euler's flow
d. Couette flow
e. Stoke's flow
Q. A structure in a channel having narrow throat and a raised floor in the bottom which is used to measure the discharge is known as
a. Venturi flume
c. Partial flume
d. Standing wave flume
e. Tilting flume