Fluid Mechanics & Hydraulics MCQs with Answers & Solutions — Page 6

Which of the following is a fundamental property of the relationship between Equipotential lines and Streamlines in a 2D irrotational flow?Fluid Kinematics

The piezometric head in a fluid flow system represents the sum of which two energy components?Fluid Dynamics

A flow is classified as ‘steady-state’ whenFluid Kinematics

Hele-Shaw flow is used to experimentally visualize potential flow because the flow of a viscous fluid between two closely spaced parallel plates is…Fluid Dynamics

Cavitation in a fluid system occurs when the local static pressure of the liquid falls belowHydraulic Machines

A hydrofoil moving through water generates lift primarily due toFlow Past Immersed Bodies

Which of the following statement(s) is/are true for Shear Velocity? (i) It is a characteristic velocity scale used in fluid mechanics to relate…Boundary Layer Theory

Which of the following statement(s) is/are true? (i) Dynamic viscosity measures a fluid's resistive flow under gravity (ii) Kinematic viscosity…Fluid Properties

For a Francis turbine, the guide vanes are used primarily toHydraulic Machines

Which of the following statements is true for a Kaplan turbine?Hydraulic Machines

A reciprocating pump is most suitable whenHydraulic Machines

Priming of a centrifugal pump is necessary toHydraulic Machines

Which of the following is the correct order of specific speeds of the respective turbines?Hydraulic Machines

Consider the following statements regarding uniform flow in channel : 1. The depth of flow and wetted area are constant at every section along the…Open Channel Flow

If Q = discharge into the channel, a = cross sectional area at the entrance, and Dn is depth at the channel entrance, what is the equation for depth…Open Channel Flow

Consider the following statements regarding draft tube of Francis turbine : 1. It permits a suction head to be established at the runner exit. 2. It…Hydraulic Turbines

Consider the following statements regarding Kaplan turbine : 1. The runner blades of Kaplan turbine runner are warped. 2. The blade angle is being…Hydraulic Turbines

Match the following lists : List I (Specific speed (rpm)): P. 8·5 to 30 Q. 50 to 340 R. 255 to 860 List II (Type of turbine): 1. Francis turbine 2.…Hydraulic Turbines

How does the bulk modulus of elasticity of a fluid change with increasing pressure ?Fluid Properties

Consider the following statements regarding stability of floating bodies : 1. If metacentre (M) lies above centroid (G), then the body is said to be…Buoyancy and Floatation

If Vs is the velocity of the vector, r is the radius of curvature and ∂Vn/∂t is the local normal acceleration; what is the expression for total…Fluid Kinematics

Consider the following statements regarding flow measurement through pipes : 1. The reduction in constriction diameter causes velocity to increase.…Flow Measurement

Consider the following statements regarding ultrasonic flowmeters : 1. There are no moving parts. 2. They cannot measure flow quantities in reverse…Flow Measurement

When the average flow is steady, which one of the following causes significant fluctuations in velocity, temperature and pressure ?Turbulent Flow

Which one of the following heads is defined as “the head against which a centrifugal pump has to work” ?Hydraulic Jump

Consider the following statements regarding positive-displacement pumps : 1. Positive-displacement pump is better able to handle shear sensitive…Hydraulic Jump

Q.23 If the pipes are connected in parallel, the total loss of head is:Flow Through Pipes

Q.27 If the actual velocity of jet at the vena contracta in an orifice meter is 'V', the depth of the centre of orifice below the free surface is 'h'…Orifices and Mouthpieces

Q.38 The air vessel in a reciprocating pump is:Hydraulic Machines

Q.40 In case of a turbulent flow in a pipe, the shear stress is:Turbulent Flow

Q.41 What is the relation between the delivery head of the centrifugal pump and the shaft speed (N)?Hydraulic Machines

Q.53 Determine the total pressure on a circular plate of diameter 2 m, which is placed vertically in water in such a way that the Centre of the plate…Hydrostatic Forces on Surfaces

Q.61 A simple U-tube manometer connected to a pipe in which liquid is flowing with a uniform speed will giveFluid Statics

Q.81 The angle of the divergent portion of a Venturi meter is kept less than the angle of the converging portion toFlow Measurement

Q.90 The Cd value of an orifice of d/D = 0.5 (d = diameter of orifice and D = diameter of the pipe) lies in the rangeFlow Measurement

Q.94 A 0.3 m diameter pipe carries oil of specific gravity 0.8 at flow velocity of 1.5 m/s and the pressure at a point A is 20 kN/m² (gauge). If the…Fluid Dynamics

Q.96 A rectangular channel 3 m wide carries water at a depth of 1.2 m. The bed slope of the channel is 0.0025. Calculate the hydraulic radius of the…Open Channel Flow

A centrifugal pump, driven by a directly coupled 2 kW motor of speed 1400 rpm, is proposed to be connected to a motor of speed 2800 rpm. The power of…Hydraulic Machines

The power of a centrifugal pump depends on the rate of flow of water. The rate of flow of water from the centrifugal pump is directly proportional to…Hydraulic Machines

The coefficient of discharge (Cd) in terms of the coefficient of velocity (Cv) and the coefficient of contraction (Cc) is:Orifices and Mouthpieces

The dimension of Manning's roughness coefficient 'n' is:Open Channel Flow

Calculate the approximate mass density of oil with 4.5 m³ of volume and 40 kN of weight. (Consider g = 10 m/s²)Fluid Properties

The difference between the total head line and the hydraulic grade line in an open-channel flow is called:Open Channel Flow

Dupuit's equation is expressed for series-connected pipes as: (where L1, L2, and L3 are lengths of pipe 1, 2 and 3; d1, d2, d3 are diameter of pipe…Flow Through Pipes

A vertical gate closes a horizontal tunnel 4 m high and 3 m wide running full with water. The bottom of the vertical gate is located at a distance of…Hydrostatic Forces on Surfaces

The kinetic head of water flowing through a pipe of diameter 60 cm is 4 m, whereas the total head of the water at a cross-section, which is 6 m above…Fluid Dynamics

If the pipes are connected in series, then the:Flow Through Pipes

A trapezoidal section is of depth 'y', base 'B' and side slope 'Z'. Find the wetted perimeter of the trapezoidal section.Open Channel Flow

Which of the following types of pumps can give discharge even at a high pressure?Hydraulic Machines

Find the discharge of water flowing over a rectangular notch of length 1 m when the constant head over the notch is 100 mm. Take Cd = 0.60, Given…Weirs and Notches