Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. The continuity equation
a. Expresses relationship between hydraulic parameters of flow
b. Relates the mass rate of flow along a stream line
c. Is based on Bernoulli's theorem
d. Is a relation for the momentum per unit volume for two points on a stream line
e. Expresses the relation between work and energy
Q. The radial component of velocity in a free vortex is
a. inversely proportional to the square of the radial distance
b. zero
c. directly proportional to the radial distance
d. inversely proportional to the radial distance
Q. For a flow between two stationary parallel plates the velocity distribution is parabolic. In this case the mean velocity is equal to
b. maximum velocity
c. one-third of the maximum velocity
d. half the maximum velocity
e. two-third of the maximum velocity
Q. The most popular generation voltage in hydro-electric power stations in India is
a. 440 kV
b. 220 V
c. 440 V
d. 6600 V
e. 11000 V
Q. The Boundary layer on a flat plate is calld laminar boundary layer if
a. Reynold No. is less than 2000
b. Reynold No. is less that 4000
c. Reynold No. is less than 5 x 105
d. None of the above
e. None of the above
Q. A fluid is a substance that
a. Is practically incompressible
b. Has the same shear stress at a point regardless of its motion
c. Cannot be subjected to shear forces
d. Cannot remain at rest under action of any sher force
e. Always expands until it fills any container
Q. A critical depthmeter is used to measure
a. Discharge in an open channel
b. Depth of oceans and rivers
c. Rise in head during hydraulic jump
d. Effective head of fluid flowing in a pipe
e. Rise in head during water hammer
Q. The force acting on a gravity dam which causes stability is
a. Reservoir water pressure
b. Uplift
c. Weight of the dam
d. Wind pressure
e. Earth and silt pressure
Q. A stationary body immersed in a river has a maximum pressure of 69 Kpa exerted on it at a distance of 5.4 m below the free surface. What velocity of river could be expected ?
a. 9 m/sec
b. 5.4 m/sec
c. 3.82 m/sec
d. 5.67 m/s
e. None of the above
Q. In reaction turbine the draft tube is used
a. To increase the effective head
b. To prevent air from entering
c. To reconvert kinetic energy to flow energy by a gradual expansion of the flow cross-section
d. To transport water to downstream without eddies
e. To run the turbine full
Q. Air vessels in a reciprocating pump is
a. Fitted in the suction line
b. Fitted in the delivery line
c. A cast iron chamber having an opening at the base
d. A, B and C above together
e. None of the above
Q. If a water tank partially filled with water is being carried on a truck with a constant horizontal acceleration, the level of liquid will
a. Rise on the front side of the tank
b. Rise on the back side of the tank and fall on front
c. Fall on the front side of the tank
d. Front side fluctuate considerably
e. Fall on the back side of the tank and rise on front
Q. The pressure centre is
a. A point on the line of action of the resultant force
b. At the centroid of the submerged area
c. Independent of the orientation of the area
d. Always above the centroid of area
e. The centroid of the pressure prism
Q. An ideal fluid is
a. One which flows through pipes with least friction
b. One which obeys Newton's law of viscosity
c. One which satisfies continuity equation
d. Similar to a perfect gas
e. Frictionless and incompressible
Q. The general energy equation is applicable to
a. Turbulent flow
b. Unsteady flow
c. Laminar flow
d. Steady flow
e. Non-uniform flow