Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. The drag force on a 40 : 1 scale model of a ship is measured to be 10 N. What force, in kN, is expected on the ship?
a. 520
b. 160
c. 80
d. 640
e. 320
Q. In an open channel, under critical depth
a. specific energy is least varying
c. specific energy is maximum
d. specific energy is minimum
e. specific energy is zero
Q. In an isothermal atmosphere the pressure
a. decreases linearly with elevation
b. cannot be related to elevation
c. is constant with elevation
d. decreases near the surface but approaches a constant value
e. decreases exponentially with elevation
Q. Which assumption is not valid in the analysis of gravity dams
a. The foundation and the dam behave as one unit, the joint being a perfect one
b. The stress in the foundation and the body of the dam are within plastic limits
c. The material in the foundation and in the body of the dam is isotropic and homogeneous
d. No loads are transferred to abutments by beam action
e. No movements are caused in the foundations due to transference of the load
Q. When power is transmitted through a considerable distance by means of water under pressure, the maximum power is transmitted when
a. Frictional loss of head is one third of the total head supplied
b. Frictional loss of head is 10% of the total head
c. Eficiency of transmission is 75%
d. Frictional loss of head is half of the total head supplied
e. Loss in transmission is 17.7%.
Q. A flow is said to be laminar when
a. The fluid particles moves in a zig-zag way
b. The Reynold number is high
c. The fluid particles move in layers parallel to the boundary
d. None of the above
e. None of the above
Q. Red wood viscometer
a. Compares viscosities of fluids
b. Measures absolute viscosity
c. Measures dynamic viscosity
d. Measures kinematic viscosity
e. None of the above
Q. In a free vortex flow, the tangential velocity is
a. directly proportional to the square of the radial distance
c. inversely proportional to the square of the radial distance
d. directly proportional to the radial distance
e. inversely proportional to the radial distance
Q. Presence of air in a pressure tunnel may result in
a. Increased discharge
b. Increased head loss
c. Water hammer
d. Bulking of flow
e. Any or all of the above
Q. Hydraulic jump is a
b. Steady non-uniform flow
c. Non-steady uniform flow
d. non-steady non-uniform flow
e. Steady uniform flow
Q. The line traced by a single fluid particle as it moves over a period of time is known as
a. Line of force
b. Flow line
c. Filament line
d. Streak line
e. Path line
Q. A U-tube manometer, attached to an air pipe, measures 20 cm of mercury. The pressure, in kPa, in the air pipe is
a. 42.5
b. 32.4
c. 26.7
d. 51.3
e. 38.6
Q. The terminal velocity of a small sphere setting in a viscous fluid varies as the
a. Inverse of the diameter
b. Inverse square of the diameter
c. Fluid viscosity
d. Inverse of the fluid viscosity
e. None of the above
Q. A draft tube converts
a. potential head into pressure head
b. pressure energy into kinetic energy
c. kinetic energy into mechanical energy
d. velocity head into potential head