If a centrifugal pump takes too much power, the cause may be
A.Low speed
B.Air in water
C.Air leakage
D.Foot valve too small
E.Heavy liquid.
Category: Fluid Mechanics and Hydraulic Machines Mcqs
The Reyonlds number may be defined as the ratio of
A.Viscous forces to inertial forces
B.Elastic forces to pressure forces
C.Viscous forces to gravity forces
D.Gravity forces to inertial forces
E.None of the above
The hydrostatic law states that rate of increase of pressure in a vertical direction is equal to
A.Density of the fluid
B.Specific weight of the fluid
C.Weight of the fluid
D.None of the above
A critical depthmeter is always
A.Associated with surge
B.Associated with water hammer
C.Associated with hydraulic jump
D.Associated with steep gradient
E.Associated with tranquil flow
A closed cubical box 0.8 m on each side is half filled with water and the other half being filled with oil of specific gravity 0.75. Now if the box is accelerated upwards at the rate of 4.905 m/sec2 the pressure difference in kg/m2 between the top and bottom layers would be
A.490.5
B.545.5
C.981
D.1050
E.1800
Pressure co-efficient is a ratio of pressure forces to
A.Viscous forces
B.Intertial forces
C.Gravity forces
D.Surface tension forces
E.Elastic energy forces
In Red wood viscometer
A.Absolute value of viscosity is determined
B.Part of the head of fluid is utilised in overcoming friction
C.The fluid discharges through orifice with negligible velocity
D.The fluid should rapidly flow out of the orifice
E.Comparison of viscosity is done
By the usual gravity analysis as per B.I.S., the permissible tensile stresses at the upstream face of the dam under earthquake loading, should not exceed
A.50 kg/ cm2
B.100 kg/ cm2
C.150 kg/ cm2
D.200 kg/ cm2
E.Zero
In an impulse turbine
A.Water must be admitted over the whole circumference
B.It is not possible to regulate the flow without loss
C.Wheel must run full and kept entirely submerged in water below the tailrace
D.The pressure in the driving fluid as it moves over the vanes is atmospheric
E.None of the above
In a Buttress dam, when the height of dam is 10 m to 25 m, the spacing of buttress is usually restricted to
A.1 m
B.1.5 m
C.4.5 to 6 m
D.10 to 15 m
E.20 to 25 m.
