Fluid Mechanics & Hydraulics MCQs with Answers & Solutions — Page 2

For a two-dimensional flow, if x-component of velocity is u = 6xy – 2x², then y-component of velocity for continuity equation to be satisfied isFluid Dynamics

Which of the following rules are used in selecting the repeating variables in dimensional analysis? (1) Repeating variables should include the…Dimensional Analysis and Similitude

A model of reservoir is emptied in 10 minutes. If the model scale is 1:25, then the time taken by the prototype to empty itself would beDimensional Analysis and Similitude

The relation that must hold for the flow to be irrotational isFluid Kinematics

Velocity at a point in two-dimensional flow is given as V=2i+3j. The equation of stream line passing through the point isFluid Kinematics

A stream function is given by Ψ = 2x²y + (x+1)y². The flow rate across a line joining points (3,0) and (0,2) isFluid Kinematics

The velocity distribution for the flow between two parallel plates, both at rest is parabolic in nature. The distance between the two plates is 0.3 m…Laminar Flow

If capillary rise of water in 1 mm diameter tube is 3 cm, then the height of capillary rise of water in 0.2 mm diameter tube will beFluid Properties

It has been observed for critical depth (yc) in a rectangular channel carrying a constant discharge that 1. Specific energy is maximum 2. Froude…Open Channel Flow

If error in the measurement of head in a V-notch is 1%, then the error in the measurement of discharge will beWeirs and Notches

A symmetrical right–circular cone of wood, floats in fresh water with axis vertical and the apex downmost. The axial height of the cone is (H). The…Buoyancy and Floatation

The flow of water in wash hand basin when it is being emptied through a central opening, is an example ofVortex Flow

The coefficient of velocity (Cv) for an orifice is given by (where, H = head over the orifice; x = horizontal distance travelled by a particle in…Orifices and Mouthpieces

A rectangular plane surface 2 m wide and 3 m deep lies in a vertical plane in water. When its upper edge is horizontal and coincides with water…Hydrostatic Forces on Surfaces

A circular plate 2 m diameter is placed vertically in water such that the centre of plate is at a distance of 3 m below free surface of water. Taking…Hydrostatic Forces on Surfaces

The velocity components in 3-dimensional flow is given by u = 4x³; v = –10x²y and w = 2t. The resultant velocity at a point (1, 1, 1) and at t = 1…Fluid Kinematics

In which of the following type of flow, the velocity of the fluid will not change with time?Fluid Kinematics

The sequent depth ratio for hydraulic jump occurring in horizontal, frictionless and rectangular channel is given by (where, y1 and y2 are pre-jump…Hydraulic Jump

For a flow in a rectangular channel, the flow velocity is 15 m/s. For a depth of flow of 0.4 m, Froude’s number will be (Take value of acceleration…Open Channel Flow

The backing up of water in a stream due to dam construction is an example ofGradually Varied Flow

The critical depth (yc) for a rectangular channel 2.5 m wide having a specific energy of 1.5 m will beSpecific Energy in Open Channel Flow

The critical depth (yc) for a triangular channel with a side slope of 1H:1V having a specific energy of 2.5 m will beSpecific Energy in Open Channel Flow

For a triangular channel having a side slope of 1.5 Horizontal: 1 Vertical, the Froude number is given by (where, V = mean velocity of flow in…Open Channel Flow

In the falling sphere method,Fluid Properties

Which of the following forces are considered in deriving Euler’s equation of motion?Fluid Dynamics

If the atmospheric pressure on the surface of an oil tank (Sp. Gr. 0.8) is 0.1 kg/cm², then the pressure at a depth of 2.5 m isFluid Statics

The SI unit of dynamic viscosity isFluid Properties

Which equation relates shear stress and velocity gradient in a Newtonian fluid?Fluid Properties

The pressure rise in a pipeline due to a sudden closure of a valve is calledFlow Through Pipes

A pelton turbine is most suitable forHydraulic Machines

The function of an air vessel in a reciprocating pump is toHydraulic Machines

A rectangular pontoon is 5 m long, 3 m wide and 1·20 m high. The depth of immersion of the pontoon is 1·0 m in sea water. If the centre of gravity is…Buoyancy and Floatation

What are the vorticity components at a point (1, 1, 1) for the following flow field ? u = 2x² + 3y, v = – 2xy + 3y² + 3zy, w = – 1·5z² + 2xz – 9y²zFluid Kinematics

Which of the following sets of equations represent(s) possible two-dimensional incompressible flows ? 1. u = x + y; v = x – y 2. u = x + 2y; v = x² –…Fluid Kinematics

A venturimeter having area of 700 cm² × 150 cm² is inserted in a vertical pipe carrying water, flowing in the upward direction. A differential…Flow Measurement

The flow of incompressible fluid is defined by u = 2, v = 8x. What is the stream function ? (where C = constant)Fluid Kinematics

Water at 60°C flows between two large flat plates. The lower plate moves to the left at a speed of 0·3 m/s. The plate spacing is 3 mm and the flow is…Laminar Flow

The rate of flow of water through a horizontal pipe is 0·25 m³/s. The diameter of the pipe which is 200 mm is suddenly enlarged to 400 mm. The…Flow Through Pipes

Water is flowing with a velocity of 1·5 m/s in a pipe of length 2500 m and of diameter 500 mm. At the end of the pipe, a valve is provided. What is…Flow Through Pipes

A Pelton wheel is having a mean bucket speed of 10 m/s with a jet of water flowing at the rate of 700 litre/s under a head of 31·25 m. The buckets…Hydraulic Machines

Consider the following statements regarding the operating characteristic curves of centrifugal pumps : 1. The input power curve will pass through the…Hydraulic Machines

A wooden block of rectangular section 1·25 m wide, 2 m deep, 4 m long floats horizontally in sea water. The specific gravity of wood is 0·64 and…Buoyancy and Floatation

Which of the following correctly depicts the continuity equation in its integral form ? (The options as printed in the paper)Fluid Dynamics

Without velocity of approach, the discharge through a Cipolletti weir is :Weirs and Notches

What is the depth of a point below water surface in sea where pressure intensity is 1·006 MN/m² and the specific gravity of seawater is 1·025?Fluid Statics

The phenomenon of sudden rise in pressure in the pipe is known asFlow Through Pipes

In a long pipe, when the flowing water is suddenly brought to rest by closing the valve or by any similar cause, there will be a sudden rise in…Flow Through Pipes

What is the approximate efficiency of a Kaplan turbine developing 3000 kW under a net head of 5 m? It is provided with a draft tube with its inlet…Hydraulic Machines

Which one of the following pressure gauges is most accurate device and is used for precision work and calibrating other pressure gauges?Fluid Properties

Water is flowing through a pipe of 5 cm diameter under a pressure of 29·43 N/cm² (gauge) and with mean velocity of 2 m/s. What is the total head of…Fluid Dynamics