Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Model analysis of aeroplanes and projectiles moving at supersonic speed are based on
a. Weber number
b. Reynold number
c. Froude number
d. Euler number
e. Mach number
Q. The units of surface tension are
a. Same as units of force
b. Energy/unit area
c. Force/unit area
d. It is dimensionless
e. None of the above
Q. Pressure co-efficient is a ratio of pressure forces to
a. Elastic energy forces
b. Viscous forces
c. Gravity forces
d. Intertial forces
e. Surface tension forces
Q. Which conduit entrance is expected to have least loss coeffieient?
a. Circular bell mouth entrances
b. Square cornered entrance
c. Square bell mouth entrances
d. Slightly rounded entrance
e. Inward projecting entrances
Q. Which one of the following results in loss in an electric generator
a. Air drag
b. Friction in bearing
c. Direct current power for excitation
d. Heat generated in armature winding
e. All of the above
Q. A surge tank is provided in the hydropower schemes to
a. minimize the cost of hydro-power development
b. reduce frictional losses in the system
c. reduce water hammer pressures
d. strengthen the penstocks
Q. The boundary layer separation takes place if
a. Pressure gradient is zero
b. Pressure gradient is positive
c. Pressure gradient is negative
d. None of the above
e. None of the these answers
Q. Which of the following gauge can be used for the measurement of velocity of an aircraft?
a. Ionization chamber
b. Pilot tube
c. Inclined manometer
d. Venturimeter
e. Hot wire anemometer
Q. Submerged weight of a body is
a. less than its weight in air
b. equal to its weight in air
c. greater than its weight in air
d. greater than its weight in vacuum
Q. The continuity equation in ideal fluid flow
a. Applies to irrotational flow only
b. States that the net rate of in-flow into any small volume must be zero
c. States that the energy remains constant along stream line
d. States that energy is constant everywhere in the fluid
e. Impulses to existence of a velocity potential
Q. As the pump speed increases, its NPSH (net positive section head) requirement
a. Decreases
b. Remains unaffected
c. Increases
d. May increase or decrease
e. None
Q. A Francis turbine is
a. Inward flow reaction turbine
b. Inward flow impulse turbine
c. Outward flow reaction turbine
d. Outward flow impulse turbine
e. None of the above
Q. Portion of the installed reserve kept in operable condition but not placed in service to supply the peak load is known as
a. Spinning reserve
b. Operating reserve
c. None-spinning reserve
d. Hot reserve
e. Cold reserve