Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. The capillary rise in a narrow two-dimensional slit of width 'W' is
b. helf of that in a capillary tube of diameter 'W'
c. two-thirds of that in a capillary tube of diameter 'W'
d. One-third of that in a capillary tube of diameter 'W'
e. One-fourth of that in a capillary tube of diameter 'W'
Q. The wake
a. always occurs after a separation point
b. is a region of high pressure intensity
c. always occurs before and after separation point.
d. always occurs before a separation point
Q. At point A in a pipe line carrying water the diameter is 1 m, the pressure 98 kPa and the velocity 1 m/s. At point B, 2 m higher than A, the diameter is 0.5 m and the pressure 20 kPa. The direction of flow would be
a. A to B
b. B to A
c. Cannot be ascertained from data
d. None of the above
Q. In which contact condition case the value of coefficient of friction is expected to be highest?
a. Steel on steel
b. Steel on steel with two layers of graphite service in between
c. Steel on concrete
d. Steel on steel, greased plates
e. Packing and liner
Q. Stanton diagram is a plot of
a. log of friction factor against log of Reynolds number
b. friction factor against Reynolds number
c. friction factor against log of Reynolds number
d. log of friction factor against Reynolds number
Q. A body floats in stable equilibrium
a. When the C.G. of body is below the centre of buoyancy
b. When the metacentre is below C.G.
c. When the C.G. of body is above the surface of water
d. When the metacentric height is zero
e. When the metacentre is above C.G.
Q. Which two forces are most important in floating bodies
a. Viscous, buoyancy
b. Gravity, inertial
c. Pressure, viscous
d. Buoyancy, gravity
e. Inertial, pressure
Q. Capillarity is due to
a. Adhesion
b. Adhesion and cohesion
c. Gravity
d. Cohesion
e. Molecular structure
Q. Capillary action is due to the
a. Viscosity of liquid
b. Cohesion of liquid particles
c. Surface tension
d. Adhesion of liquid particles on the surface
e. None of the above
Q. Capacity of a hydro-electric plant in service in excess of the peak load is known as
a. Peak reserve
b. Hot reserve
c. Spinning reserve
d. Cold reserve
e. Operating reserve
Q. Mach number is significant in
a. Flow in space above the atmosphere of air
b. High speed flow of water
c. Flow of highly viscous fluids
d. Flow of metallic fluids
e. Flow in air at speeds more than that of sound
Q. Critical speed of turbine is
a. Same as maximum operating speed
b. Same as run away speed
c. The speed equal to synchronous speed of generator
d. The speed at which shaft will break
e. The speed at which the number of natural vibrations or natural frequency equals the number of revolutions per minute
Q. The disadvantage of burried penstocks is
a. Protection against freezing of conveyed water
b. Protection against earthquake shock
c. Difficulty in repair and maintenance
d. Immunity against rock sides, avalanches and falling tree
e. Protection against effect of temperature because of soil cover
Q. When a venturimeter is used in an inclined position, it will show
a. Sale reading
b. More reading
c. Less reading
d. Depends on vescosity of fluid
e. None of the above
Q. The dynamic viscosity of most of the gases with rise in gas temperature
a. Increses inversely as ?T
b. Decreases
c. Increases
d. Does not change significantly
e. Increases as ?T