Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Identify the statement which is not one of the assumptions made for the derivation of Bernoulli's theorem
a. All the above
b. The flow is two dimensional
c. Fluid is incompressible
d. Fluid is ideal
e. The flow is steady and continuous
Q. A piezometer is not used for pressure measurement in pipes when
a. Velocity of fluid is low
b. The pressure drop in the pipe is low
c. The pressure is very low
d. Velocity of fluid is high
e. The fluid in the pipe is a gas
Q. In a flow field, at the stagnation point
a. total energy is zero
b. pressure head is equal to velocity head
c. All the velocity head is converted into pressure head
d. pressure is zero
Q. Eulers dimensionless number relates the following
a. None
b. Pressure force and viscous force
c. Inertial force and gravity
d. Viscous force and inertial
e. Pressure force and inertial force
Q. Tranqil flow must always occur
a. Below normal depth
b. Above normal depth
c. Above critical depth
d. Below critical depth
e. At normal depth
Q. An orifice is said to be a large orifice when
a. Electrical conductivity
b. An orifice can discharge fluid within 10 minutes
c. The cross-section of orifie is not less than 10% of the cross-section of tank
d. The head over the orifice is smaller than its vertical dimensions
Q. When the Reynolds number is less than 500 the flow is said to be laminar for
a. pipe flow
b. flow between parallel plates
c. free surface flow
d. all of the above
Q. If the forces due to inertia, gravity and frictional resistance are insignificant, the design of a channel may be made by comparing
a. Reynolds number
b. Weber number
c. Froude's number
d. Schmidt number
e. Prandt number
Q. The maximum continuous power available from a hydro-electric plant under the most adverse hydraulic conditions is known as
a. Primary power
b. Firm power
c. Installed capacity
d. Base power
e. Secondary power
Q. Boundary layer thickness (?) is the distance from the surface of the solid body in the direction perpendicular to flow, where the velocity of fluid is equal to
a. Free stream velocity
b. 0.9 times the free stream velocity
c. 0.99 times the free stream velocity
d. None of the above
e. Free vortex motion
Q. Capallary waves in channels, capillary rise in narrow passages are the instances where
b. surface tension is negligible
c. elastic forces are prefominant
d. surface tension cannot be neglected
e. viscous forces play a dominant role
Q. Drag force in not a function of
a. mass density of the fluid
b. mass density of the body
c. velocity of the body
d. projected area of the body
Q. In Buttress dam, too flat a slope causes
a. A very high inclined stress at the heel
b. Overloading of buttress sections
c. Excessive tensile stress on upstream face
d. Increased tendency to overturning
e. Excessive tensile stresses in the foundation and the body of the dam
Q. The flow between any two stream lines
a. decreases along its path
c. remains the same
d. increases along its path
e. is always zero
Q. A streamline
a. is the line of equal velocity in a flow
b. occurs on all types of flows
c. is fixed in space in space flow
d. 51.3
e. is the line along geometrical centre of the flow