Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Relative velocity is
a. Sum of two velocities
b. Average velocity
c. The difference between two velocities
d. Vector difference of two velocities
e. The difference between the higher velocity and average velocity
Q. As the temperature decreases, the viscosity of a gas
a. 2.45
b. increases, increases
c. decreases, decreases
d. increases, decreases
e. decreases, increases
Q. The horizontal to vertical side slope in case of Cpppoletti weir is
a. I : I
b. 1 : ?2
c. I : 4
d. 4 : I
e. I : 2
Q. In case of Constant Angle Arch Dam, the most favourable central angle is
a. 170?
b. 90?
c. 165?
d. 133?
e. 73?
Q. A trapezoidal weir of horizontal crest with side slopes of one horizontal to four vertical is called
a. trapezoidal weir
b. cippoletti weir
c. sultro weir
d. None of the above
Q. Which two forces are most important in laminar flow between closely parallel plates?
b. Gravity and pressure
c. Viscous and pressure
d. Inertial and viscous
e. Pressure and inertial
Q. SI unit of viscosity is
a. 10 times poise
b. 9.81 times poise
c. 1/9.81 times poise
d. Equal to poise
e. None of the above
Q. If the specific speed of turbine is more than 300, the type of turbine is
a. Kaplan
b. Pelton with nose jets
c. Greater than ten
d. Pelton
e. Francis
Q. The velocity distribution in a turbulent flow in a pipe is often assumed to
a. be zero at the wall and increase linearly to the centre
b. vary according to the 1/7 th power law
c. be maximum at the wall and decrease linearly to the centre
d. be unpredictable and is thus not used
e. vary parabolically
Q. Which conduit entrance is expected to have highest loss coefficient?
a. Gate in thin wall-unsuppressed contraction
b. Fully rounded entrance having x/D>0.15
c. Gate in thin wall-bottom and side suppressed
d. Inward projecting entrances
e. Gate in thin wall-corners rounded
Q. The principle, "The buoyancy is equal to the weight of the fluid displaced and the line of action is through the centroid of the displaced mass" is known as
a. Newton's law
b. Bernoulli's law
c. First law of fluid mechanics
d. Law of buoyancy
e. Archimedes principle
Q. The distance from pipe boundary, at which the point velocity is equal to average velocity in case of turbulent flow (when R is the radius of the pipe), is
a. 0.892 R
b. 0.223 R
c. 0.446 R
d. 0.111 R
Q. A fluid in which resistance to deformation is independent of the shear stress is known as
a. Bingham plastic fluid
b. Pseudo plastic fluid
c. Dilatant fluid
d. Newtonian fluid
e. None of the above
Q. The minimum diameter necessary to avoid the capillary rise in the manometer is
a. 6 mm
c. 1 mm
d. 3 mm
e. 15 mm