_________ 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
4.Radial discharge
Posted Date:-2022-07-28 08:20:08
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
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
Cavitation usually occurs due to the changes in ________
1.Pressure
2.Temperature
3.Volume
4.Heat
Posted Date:-2022-07-28 08:10:33
Centrifugal head in Outward flow reaction turbine _____________
1.Increases
2.Decreases
3.Remains constant
4.Gradually decreases
Posted Date:-2022-07-27 11:49:13
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
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
Discharge in an outward flow reaction turbine ____________
1.Increases
2.Decreases
3.Remains constant
4.Gradually decreases
Posted Date:-2022-07-28 08:26:41
Discharge in outward flow reaction turbine ____________
1.Increases
2.Decreases
3.Remains constant
4.Gradually decreases
Posted Date:-2022-07-27 11:49:45
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
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
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
Hydrodynamic cavitation is due to the process of _________
1.Vaporisation
2.Sedimentation
3.Filtration
4.Excavation
Posted Date:-2022-07-28 08:14:40
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
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
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
4.Radial discharge
Posted Date:-2022-07-28 08:26:07
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
4. Radial discharge
Posted Date:-2022-07-28 08:25:27
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
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
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
In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where “k†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
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
Radial flow reaction turbines are those turbines in which water flows ____________
1.Radial direction
2. Axial direction
3.Tangential direction
4.All of the mentioned
Posted Date:-2022-07-27 11:03:22
Radial flow reaction turbines contain spiral casing which area ____________
1.Remains constant
2.Gradually decreases
3.Gradually increases
4.Suddenly decreases
Posted Date:-2022-07-27 11:06:51
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
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
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
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
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
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
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
The outward radial flow reaction turbine is a turbine in which direction of water flow is ___________
1.Radial direction
2. Radially inward
3.Radially outward
4.Axial direction
Posted Date:-2022-07-27 11:44:59
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
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
The velocities of the blade angles can be found out using________
1.Mach number
2.Froude’s number
3.Velocity triangles
4.Reynolds number
Posted Date:-2022-07-28 08:13:37
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
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
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
What is the degree of reaction denoted as?
1.D
2.R
3.r
4.d
Posted Date:-2022-07-28 08:10:06
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
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 – n*t
2.Pi*d – n*n*t
3.Pi*d – t*t
4.Pi*d *d– n*t
Posted Date:-2022-07-28 08:19:34
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
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
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
___________ 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
___________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
____________ 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
____________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
____________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
_____________ 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