Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. The simplest type of controls for reservoir outlets is provided by
a. Radial gates
b. Slide gates
c. Jet flow gates
d. Cylindrical gates
e. Height pressure gates
Q. In order that the water shall never rise more than 100 cm above the crest for a discharge of 5 cube metres per second, the length of weir will be
a. 2.5 metres
b. 2.51 metres
c. 2.00 metres
d. 1 metre
e. 2.49 metres
Q. In a turbulent flow in a pipe we know the
a. Viscous stresses dominate
b. Reynolds number is greater than 10,000
c. Shear stress varies linearly with radius
d. Head loss varies linearly with the flow rate
e. Fluid particles move in straight lines
Q. The Reynolds number for pipe flow is given by
a. VD/v
b. VD
c. VD ? /
d. VD /
e. None of the above
Q. In MLT system the dimensions of angular momentum would be
a. ML2T-2
b. MLT-2
c. MLT-1
d. ML2T-1
e. ML2T
Q. Euler's equation of motion can be integrated when it is assumed that
a. The flow is rotational
b. Continrity equation is satisfied
c. Velocity potential exists and the density is constant
d. The fluid is incompressible
e. Bernoulli's satisfied
Q. Falling drops of water become spherical due to
a. Dynamic viscosity
b. Cohesion
c. Adhesion
d. Surface tension
e. Kinematic viscosity
Q. If the specific speed of a turbine is 6 then the turbine should be
a. Thomson
b. Kaplan
c. Pelton wheel
d. Francis
e. Fourneyron
Q. The pressure gradient in laminar motion along the flow dirction is equal to
a. velocity gradient
c. the rate of change of shear stress normal to the direction of flow
d. the rate of change of velocity normal to the direction of flow
e. the rate of change of shear stress along the direction of flow
Q. The viscosity of a fluid with specific gravity 1.3 is measured to be 0.0034 Ns/m2. Its kinematic viscosity, in m2/s, is
a. 5.8 x 10-6
b. 2.6 x 10-6
c. 9.6 x 10-6
d. 4.4 x 10-6
e. 7.2 x 10-6
Q. Reynold's no. may be defined as the ratio of
a. Viscous forces to gravity forces
b. Viscous forces to inertial forces
c. Gravity forces to thertial forces
d. None
e. Elastic forces to pressure forces
Q. Rocks with excessive internal stresses which may cause spalling are known as
a. Popping rocks
b. Stratified rocks
c. Swelling rocks
d. Crushed rocks
e. Schistos rocks
Q. For hypersonic flow, the Mach no, is
a. Creater than two
b. Greater than unity
c. Greater than four
d. Greater than ten
e. Unity
Q. A mouthpiece cannot be used under very large head because
a. The variation in discharge is large
b. Cavitation occurs at the vena contracta
c. Of practical difficulties in contraction
d. Vortex is created at the vena contracta
e. The flow through mouthpiece is erratic