The turbulent flow is hydraulically smooth if the ratio height of roughness projection/the thickness of laminar sub-layer is less than
A.1
B.0.8
C.0.75
D.0.5
E.0.25
Category: Fluid Mechanics and Hydraulic Machines Mcqs
A critical depthmeter is used to measure
A.Effective head of fluid flowing in a pipe
B.Depth of oceans and rivers
C.Rise in head during water hammer
D.Rise in head during hydraulic jump
E.Discharge in an open channel
In order to keep out debris and other materials carried by water which are likely to damage turbine, provision is made by
A.Trash racks
B.Radial gates
C.Trunions
D.Jet flow gates
E.Ensign valve
The oscillatory motion of a ship or a boat about its transverse axis is termed as
A.Transverse motion
B.Transverse harmonic motion
C.Rolling
D.Pitching
E.Gyro-motion
Essentially the gravity dam resists the loads to which it is exposed, due to its
A.Size
B.Volume
C.Mass
D.High tensile stress
E.Gravity
If a barometer carries wter instead of mercury, the height of column for a pressure equivalent to 75 cm of mercury will be
A.1020 cm
B.1000 cm
C.1034 cm
D.1040 cm
E.1050 cm
Density in terms of viscosity is
A.Kinematic viscosity/Dynamic viscosity
B.Dynamic viscosity/Kinematic viscosity
C.Kinematic viscosity x dynamic viscosity
D.Any of the above
E.None of the above
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
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
In a reaction turbine
A.It is possibel to regulate the flow without loss
B.It must be placed at the foot of the fall and above the tail race
C.Work done is purely by the change in the kinetic energy of the jet
D.Only part of the head is converted into velocity before the water enters the wheel
E.None of the above
