Hydraulics and Fluid Mechanics Questions

• A channel is said to be of most economical cross-section, if
• The purpose of a surge tank is
• In two dimensional flow, the flow does not take place in a curve.
• The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.
• The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by
• In an internal mouthpiece, if the jet after contraction expands and fills up the whole mouthpiece, then the mouthpiece is said to be running free.
• The specific gravity of an oil whose specific weight is 7.85 kN/m3, is
• The coefficient of discharge is the ratio of dieoretical discharge to the actual discharge through an orifice.
• When an internal mouthpiece is running full, the discharge through the mouthpiece is twice the discharge when it is running free.
• A pitot tube is used to measure the
• The pressure at a point 4 m below the free surface of water is
• An average value of coefficient of velocity is
• The velocity of flow is same at all points in the cross-section of a channel.
• According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C = Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed)
• Surface tension force is the product of surface tension per unit length and cross-sectional area of flow.
• The coefficient of discharge for an external mouthpiece depends upon
• A vessel of 4 m3 contains an oil which weighs 30 kN. The specific weight of the oil is
• A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called
• In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be
• The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.