Fluid Mechanics & Hydraulics MCQs with Answers & Solutions — Page 3

Pitot tube is one of the most accurate devices forFlow Measurement

A circular disc 3 m in diameter is held normal to a 26·4 m/s wind of density 1·2 kg/m³. If the coefficient of drag of disc is 1·1 the force required…Flow Past Immersed Bodies

What is the discharge through the venturi flume built in a rectangular channel 1 m wide and having its throat width 0·4 m? The upstream head is 0·57…Weirs and Notches

A spherical object of 1·45 m diameter is completely immersed in a water reservoir and chained to the bottom. If the chain has a tension of 5·2 kN,…Buoyancy and Floatation

A double-acting reciprocating pump having piston area 0·1 m² has a stroke 0·30 m long. If the pump is discharging 2·4 m³ of water per minute at 45…Hydraulic Machines

A centrifugal pump is required to lift water to a total head of 40 m at the rate of 50 L/s. If its overall efficiency is 62%, the power required for…Hydraulic Machines

Full load is supplied by the turbine shaft when the diameter of jet issuing from the nozzle is 150 mm. If the load suddenly drops to 36% of the full…Hydraulic Machines

A double-acting reciprocating pump, running at 40 r.p.m., is discharging 1·0 m³ of water per minute. The pump has a stroke of 400 mm. The diameter of…Hydraulic Machines

Water hammer pressures can be reduced by usingFlow Through Pipes

The mean drag coefficient (C_DF) for a laminar boundary layer along a flat plate was found to be 0.015. If all other flow factors remain the same and…Boundary Layer Theory

A pipe is connected in series to another pipe whose diameter is twice and the length is 32 times that of the first. The ratio of the frictional head…Flow Through Pipes

Two tanks are connected in parallel by two pipes A and B of identical friction factors and lengths. If the size of pipe A is double than that of pipe…Flow Through Pipes

Which of the following is correct? If the number of jets in a Pelton turbine is n then the specific speed is proportional toHydraulic Machines

The ratio of actual discharge to theoretical discharge through an orifice isOrifices and Mouthpieces

A pump and its (1/4) scale model are being compared. If the ratio of the heads is 5:1, then the ratio of the power consumed by the prototype and the…Hydraulic Machines

In a single reciprocating pump without air vessel, the ratio of the average friction head to the maximum friction head in the delivery pipe is given…Hydraulic Machines

A similar model of a pump is built to a ratio of 1:2. If the model pumps has the same fluid as the prototype at the same rotative speed, then the…Hydraulic Machines

In all reaction turbines, maximum efficiency is obtained if (Note: All angles are measured with respect to the direction of the peripheral velocity.)Hydraulic Machines

The net available head H in a Pelton turbine installation is theHydraulic Machines

In the Francis turbine, the runner blades are radial at the entrance and the discharge is radial at the outlet. For this turbine,Hydraulic Machines

The head-discharge characteristic curve of two centrifugal pumps in 1. parallel can be obtained by doubling the ordinates 2. series can be obtained…Hydraulic Machines

The drag of a body moving in air at supersonic velocityFlow Past Immersed Bodies

For a sphere falling at terminal velocity in the Stokes’ law range, the drag coefficient C D is given byFlow Past Immersed Bodies

Pressure drag results due toFlow Past Immersed Bodies

In calculating the lift force,Flow Past Immersed Bodies

The nominal distance of a boundary layer is defined as the distance from the wall to a pointBoundary Layer Theory

In a pipe network,Flow Through Pipes

Three pipes are connected in series. Then,Flow Through Pipes

In a pipeline design, the usual practice is to assume that due to agingFlow Through Pipes

Francis turbine is the one which isHydraulic Machines

Cavitation is caused byHydraulic Machines

Which of the following rules are used in choosing the repeating variables in dimensional analysis?Dimensional Analysis and Similitude

Consider the following statements to reply further: 1. Pumps in series operation allow the head to increase. 2. Pumps in series operation increase…Hydraulic Machines

Which one of the following phenomena in a pipe flow is termed as water hammer?Flow Through Pipes

Two pipe systems are said to be equivalent in their lengths whenFlow Through Pipes

The distorted models used in the hydraulic studies are those whichDimensional Analysis and Similitude

Which one of the following statements is not correct?Hydraulic Machines

Which of the following fluids can be classified as non-Newtonian? 1. Kerosene oil 2. Diesel oil 3. Human blood 4. Tooth paste 5. Water Select the coFluid Properties

Two pumps identical in all respects and each capable of delivering a discharge, against a head H are connected in series, the resulting discharge isHydraulic Machines

A fast centrifugal pump impeller will haveHydraulic Machines

In the analysis of networks of pipes,Flow Through Pipes

Two hydraulic turbines are similar and homologous, when they are geometrically similar and haveHydraulic Machines

For a 1:m scale model of a turbine, the specific speed of the model Nₛₘ is related to the prototype specific speed Nₛₚ as Nₛₘ =Hydraulic Machines

Consider the following statements related to concept of continuity equation and the concept of control volume in deriving equation. 1. Continuity…Fluid Dynamics

The vertical component of pressure force on a submerged curved surface is equal toHydrostatic Forces on Surfaces

A control volume refers to which of the following?Fluid Dynamics

Conveyance of a channel section is directly proportional to which of the following?Open Channel Flow

Hydraulic jump can be used forHydraulic Jump

A normal shock wave is analogous toHydraulic Jump

The force exerted by a jet on a curved plate isImpact of Jets