# Engineering/Hydraulic Machines MCQs Set-3 Sample Test,Sample questions

## Question: ``` _________ means the angle made by absolute velocity with the tangent on the wheel is 90 degrees and the component of whirl velocity is zero. ```

1.Axial discharge

2.Tangential discharge

3.Turbulent discharge

Posted Date:-2022-07-28 08:20:08

## Question: ```An outward radial reaction turbine has ______ ```

1.u1 < u2

2.u1 > u2

3.u1 = u2

4.u2 = u1 = 0

Posted Date:-2022-07-28 08:28:03

## Question: ```At high pressure, the voids can generate ______ ```

1.Drag force

2.Mass density

3.Shock waves

4. Flow speed

Posted Date:-2022-07-28 08:11:41

## Question: ```Cavitation usually occurs due to the changes in ________ ```

1.Pressure

2.Temperature

3.Volume

4.Heat

Posted Date:-2022-07-28 08:10:33

## Question: ```Centrifugal head in Outward flow reaction turbine _____________ ```

1.Increases

2.Decreases

3.Remains constant

Posted Date:-2022-07-27 11:49:13

## Question: ```Degree of reaction turbine is the ratio of? ```

1.Pressure energy to total energy

2.Kinetic energy to total energy

3.Potential energy to total energy

4.Kinetic energy to potential energy

Posted Date:-2022-07-28 08:15:54

## Question: ```Degree of reactions are most commonly used in________ ```

1.Turbomachinery

2.Pressure drag

3.Aerodynamics

4.Automobiles

Posted Date:-2022-07-28 08:11:01

## Question: ```Discharge in an outward flow reaction turbine ____________ ```

1.Increases

2.Decreases

3.Remains constant

Posted Date:-2022-07-28 08:26:41

## Question: ```Discharge in outward flow reaction turbine ____________ ```

1.Increases

2.Decreases

3.Remains constant

Posted Date:-2022-07-27 11:49:45

## Question: ```Discharge through a reaction flow reaction turbine is given by, Q = ______ ```

1.Pi*d*b*Vf1

2.Pi*d*d*b*Vf1

3.Pi*d*b*b*Vf2

4.Pi*b*b*Vf1

Posted Date:-2022-07-28 08:18:50

## Question: ```Discharge through radial flow reaction turbine is ______________ ```

1.P1*b1*Vf1

2.P2*b2*Vf2

3.P1*b2*Vf2

4.Both P1*b1*Vf1 & P2*b2*Vf2

Posted Date:-2022-07-27 11:04:30

## Question: ```For an actual reaction turbine, what should be the angle beta, such that the loss of kinetic energy at the outlet is to be minimum? ```

1.90

2.45

3. 60

4.30

Posted Date:-2022-07-28 08:18:18

## Question: ```Hydrodynamic cavitation is due to the process of _________ ```

1.Vaporisation

2.Sedimentation

3.Filtration

4.Excavation

Posted Date:-2022-07-28 08:14:40

## Question: ```If the water flows from inwards to outwards, the turbine is known as _____________ ```

1.Tangential flow turbine

2.Turbulent low inward flow

3.Inward flow turbine

4.Outward flow turbine

Posted Date:-2022-07-28 08:23:18

## Question: ```In a Francis turbine, degree of reaction lies between _____ ```

1.0 and 1

2.1 and 2

3. 0 and 0.5

4.0.5 and 0.1

Posted Date:-2022-07-28 08:21:42

## Question: ```In an outward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity is ______ ```

1.Speed ratio

2.Flow ratio

3.Discharge

Posted Date:-2022-07-28 08:26:07

## Question: ```In an outward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as ___________ ```

1.Speed ratio

2.Flow ratio

3.Discharge

Posted Date:-2022-07-28 08:25:27

## Question: ```In case of gas turbines and compressors, degree of reaction is ________ ```

1.Static pressure drop in rotor/ static pressure drop in stage

2.Static pressure drop in stage/ static pressure drop in rotor

3.Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage

4.Static temperature drop in stage/ static temperature drop in rotor

Posted Date:-2022-07-28 08:12:57

## Question: ```In general, reaction turbines consist of which types of energies? ```

1.kinetic energy and potential energy

2.potential energy and pressure energy

3.kinetic energy and pressure energy

4.gravitational energy and potential energy

Posted Date:-2022-07-28 08:24:19

## Question: ```In Pelton turbine inlet velocity of jet is 85.83m/s, inlet and outlet whirl velocities be 85.83 and 0.143 and blade velocity be 38.62 then its hydraulic efficiency is ___________ ```

1.90.14%

2.80%

3.70%

4.85%

Posted Date:-2022-07-27 11:02:14

## Question: ```In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where â€œkâ€ is known as _______ ```

1.Specific density of liquid

2.Density of liquid

3.Specific gravity of liquid

4.Volume of liquid

Posted Date:-2022-07-27 10:51:55

## Question: ```Main parts of radial flow reaction turbines are ______________ ```

1.Casing

2.Guide mechanism

3.Draft tube

4.All of the mentioned

Posted Date:-2022-07-27 11:03:55

## Question: ```Radial flow reaction turbines are those turbines in which water flows ____________ ```

2. Axial direction

3.Tangential direction

4.All of the mentioned

Posted Date:-2022-07-27 11:03:22

## Question: ```Radial flow reaction turbines contain spiral casing which area ____________ ```

1.Remains constant

4.Suddenly decreases

Posted Date:-2022-07-27 11:06:51

## Question: ```Runner blades are made up of _____________ ```

1.Cast steel

2.Cast iron

3.Wrought iron

4.Steel

Posted Date:-2022-07-27 11:09:08

## Question: ```Speed control of Outward flow reaction turbine is _____________ ```

1.Easy

2.Moderate

3. Difficult

4.Very difficult

Posted Date:-2022-07-27 11:50:12

## Question: ```Tendency of wheel to race is predominant in____________turbine ```

1.Inward flow reaction turbine

2.Outward flow reaction turbine

3.Impulse turbine

4.Axial flow turbine

Posted Date:-2022-07-27 11:50:41

## Question: ```The casing of radial flow reaction turbine is made of spiral shape, so that water may enter the runner__________ ```

1.Variable acceleration

2.Constant acceleration

3.Variable velocity

4.Constant velocity

Posted Date:-2022-07-27 11:08:08

## Question: ```The energy available at inlet for outward reaction flow turbine is ____________ ```

1.Potential

2.Kinetic energy

3.Pressure energy

4.Pressure energy and Kinetic energy

Posted Date:-2022-07-27 11:48:28

## Question: ```The expression for hydraulic efficiency is given by ```

1.2(V1-u)[1+cos k]u/V1*V1

2.2(V1+u)[1+cos k]u/V1*V1

3.2(V1-u)[1-cos k]u/V1*V1

4. 2(V1+u)[1+cos k]u/V1*V1

Posted Date:-2022-07-27 10:53:03

## Question: ```The formation of vapour cavities is called _____ ```

1.Static pressure drop

2.Cavitation

3.Isentropic expansion

4.Emulsion

Posted Date:-2022-07-28 08:09:04

## Question: ```The outward radial flow reaction turbine is a turbine in which direction of water flow is ___________ ```

4.Axial direction

Posted Date:-2022-07-27 11:44:59

## Question: ```The pressure at the exit of runner of reaction turbine is generally____________than atmospheric pressure ```

1.Greater

2.Lesser

3.Constant

4.Equal

Posted Date:-2022-07-27 11:09:42

## Question: ```The process of bubble generation leads to __________ ```

1.High temperatures

2.High pressures

3.High energy densities

4.High volumetric ratio

Posted Date:-2022-07-28 08:15:19

## Question: ```The velocities of the blade angles can be found out using________ ```

1.Mach number

2.Froudeâ€™s number

3.Velocity triangles

4.Reynolds number

Posted Date:-2022-07-28 08:13:37

## Question: ```The water from penstocks enters the _____ which is spiral in shape which the area of cross section of casing goes on decreasing gradually ```

1.guide wheel

2.draft tube

3.casing

4.runner

Posted Date:-2022-07-28 08:22:43

## Question: ```Voids are created due to______ ```

1.Reaction ratio

2.Pressure ratio

3.Liquid free layers

4.Volumetric layers

Posted Date:-2022-07-28 08:09:36

## Question: ```Voids that implode near metal surface develops a_______ ```

1.Drag force

2.Cyclic stress

3.Shock waves

4.Flow speed

Posted Date:-2022-07-28 08:12:14

## Question: ```What is the degree of reaction denoted as? ```

1.D

2.R

3.r

4.d

Posted Date:-2022-07-28 08:10:06

## Question: ```When a container containing a liquid is rotated, then due to centrifugal action, then which of these energies are changed? ```

1.Kinetic energy

2.Pressure energy

3.Potential energy

4.Energy due to viscous force

Posted Date:-2022-07-28 08:17:40

## Question: ```When the thicknesses of vanes are to be considered in the discharge of a turbine, what will be the area under consideration? ```

1.Pi*d â€“ n*t

2.Pi*d â€“ n*n*t

3.Pi*d â€“ t*t

4.Pi*d *dâ€“ n*t

Posted Date:-2022-07-28 08:19:34

## Question: ```Which among the following velocities cannot be found using the velocity triangle? ```

1.Tangential

2.Whirl

3.Relative

4.Parabolic

Posted Date:-2022-07-28 08:14:07

## Question: ```Which of these options are best suited for the total energy change inside the runner per unit weight? ```

1.Degree of action

2.Degree of reaction

3.Turbulence

4.Efficiency of turbine

Posted Date:-2022-07-28 08:16:30

## Question: ```Which of these ratios are termed to be hydraulic efficiency? ```

1.Water power to delivered power

2.Delivered power to input power

3.Power lost to power delivered

4.Runner power to water power

Posted Date:-2022-07-28 08:17:06

## Question: ```___________ is a circular wheel on which a series of smooth, radial curved vanes are fixed. ```

1.Guide wheel

2. Runner

3.Casing

4.Draft tube

Posted Date:-2022-07-28 08:24:54

## Question: ```___________is a pipe of gradually increasing area used for discharging water from exit of the turbine to the tail race. ```

1.Casing

2.Guide mechanism

3.Draft tube

4.Runner

Posted Date:-2022-07-27 11:10:46

## Question: ```____________ consists of stationary circular wheel all around the runner of turbine ```

1.Casing

2.Guide mechanism

3.Runner

4.Drafting

Posted Date:-2022-07-27 11:07:25

## Question: ```____________and __________of radial flow reaction turbine are always full of water. ```

1.Casing and runner

2.Casing and penstocks

3.Runner and penstocks

4.Runner and draft tube

Posted Date:-2022-07-27 11:11:21

## Question: ```____________governs the flow of water entering the runner blades. ```

1.Casing

2.Guide vanes

3.Draft tube

4.Runner

Posted Date:-2022-07-27 11:11:53

## Question: ```_____________ allow the water to strike the vanes fixed on runner without shock at inlet ```

1.Casing

2.Guide vanes

3.Runner

4.Draft tube

Posted Date:-2022-07-27 11:08:38

## More MCQS

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