Fluid Mechanics

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Fluid Mechanics

Topic :- Hydraulic Machine (Turbine)

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Typically, a hydroelectric plant will have following hydraulic machine [SSC : JE : 2014] *

1 point

Hydraulic Pump

None of the above

Electric Motor

Hydraulic Turbine

For producing electricity, following combination of machines will be required [SSC : JE : 2014] *

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Hydraulic turbine + generator

Electric motor + pump

Generator + pump

Hydraulic turbine + electric motor

Francis turbine is [SSC : JE : 2015] *

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an axial flow turbine

an impulse turbine

a tangential flow impulse turbine

a reaction turbine

Which one of the following is correct for impulse turbine? [SSC : JE : 2018] *

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Operates by initial complete conversion to kinetic energy

Operates by initial complete conversion to potential energy

Converts pressure head into velocity with the help of vanes

Always operates in submerged condition

Which of the following turbine is suitable to generate the power of 10,000 hp, working at the speed of 500 rpm under a head of 81 m? [SSC : JE : 2018] *

1 point

Francis

Propeller

Pelton

Kaplan

A turbine generates the power of 150,000 kW while working at the speed of 300 rpm at the head of 100 m. What is the specific speed of the turbine? [SSC : JE : 2018] *

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367

300

452

340

Which of the following is CORRECT to maximize the efficiency of all reaction turbines? [SSC : JE : 2018] *

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Angle of absolute velocity vector at outlet is 90 degrees

Blade angle is 90 degrees at inlet

Guide vane angle is 90 degrees

Blade angle is 90 degrees at outlet

Draft tube at the exit of a reaction turbine used for hydroelectric project is __________ [SSC : JE : 2018] *

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always immersed in water

above or below the water surface, depends on unit speed of the turbine

always above the water surface

may either be below o r above the water surface

In the hydel system, a forebay is used at the junction of _________. [SSC : JE : 2018] *

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power channel and penstock

penstoke and turbine

power channel and tail race channel

tail race channel and penstock

When High head of water is available, then most suitable turbine used to convert hydraulic energy into mechanical energy will be [WRD : 2016] *

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Reaction turbine

Francis turbine

Kaplan turbine

Pelton wheel turbine

Reaction turbine operates [WRD : 2016] *

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On high head of water

At the foot of the fall

Under pressure

None of these

If the water flows radially from inwards to outwards the turbine is known as [PWD : 2018] *

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axial flow turbine

outward radial flow turbine

inward radial flow turbine

none of the above

The curves with the help of which the exact behavior and performance of a hydraulic turbine under different working conditions can be known are called [PWD : 2018] *

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None of the above

Characteristic curves

Oscillatory curves

Non-Characteristic curves

What are the types of turbine according to the head at the inlet of the turbine? 1. high head turbine 2. medium head turbine 3. low head turbine 4. mixed head turbine [PWD : 2018] *

1 point

Only 1

All 1, 2, 3, 4

Both 1 and 2

Only 1, 2 and 3

What are the types of turbine according to the specific speed of the turbine? 1. Low specific speed turbine 2. Medium specific speed turbine 3. High specific speed turbine 4. Mixed specific speed turbine [PWD : 2018] *

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All 1, 2, 3, 4

Only 1

Only 1, 2 and 3

Both 1 and 2

If the water flows through the runner along the direction parallel to the axis of rotation of the runner the turbine is called [PWD : 2018] *

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outward radial flow turbine

inward radial flow turbine

none of the above

axial flow turbine

If at the inlet of the turbine, the energy available is only kinetic energy ,the turbine is known as [PWD : 2018, MPSC : 2017,2018] *

1 point

semi-reaction turbine

impulse turbine

reaction turbine

no such turbine are practical

If at the inlet of the turbine the water possesses kinetic energy as well as pressure energy,the turbine is known as [PWD : 2018, MPSC: 2018] *

1 point

tangential flow turbine

radial flow turbine

impulse turbine

reaction turbine

The pelton turbine is [PWD : 2018] *

1 point

radial flow reaction turbine

mixed flow reaction turbine

axial flow impulse turbine

tangential flow impulse turbine

In which one of the following axial flow reaction turbine, vanes are fixed to the hub and are not adjustable? [PWD : 2018] *

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Francis turbine

none of the above

Kaplan turbine

Propeller turbine

In which one of the following axial flow reaction turbine, vanes are not fixed to the hub andare adjustable? [PWD : 2018] *

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Kaplan turbine

Propeller turbine

Francis turbine

none of the above

In a turbine system the shaft power obtained is 500 watt and overall efficiency is 0.5 what is water power [PWD : 2018] *

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429 watts

321 watts

250 watts

1000 watts

If the water flows along the tangent of the runner, the turbine is known as the [PWD : 2018] *

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impulse turbine

radial flow turbine

tangential flow turbine

reaction turbine

In all reaction turbines, the following conditions should be satisfied for maximum efficiency : [MPSC : 2012] *

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Velocity of flow at entrance must be zero

Velocity of whirl at outlet must be zero

The velocity of flow at outlet must zero

The velocity of whirl at entrance must. he zero

The specific speed of turbine is defined as [MPSC : 2015] *

1 point

Muschel curves belong to the category of : [MPSC : 2015] *

1 point

main characteristic curves of a turbine

operating characteristic curves of a turbine

constant efficiency curves of a turbine

operating characteristics of a pump

Number of buckets on a Pelton wheel are calculated by which equation with usual notations : [MPSC : 2015] *

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Z = 15 + (2D/d)

Z = 15 + (D/2d)

Z = 15 + 2(D/d)n

Z = 15 + (d/D)

A turbine is a device which converts : [MPSC : 2015, 2018] *

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Electrical energy into mechanical energy

Kinetic energy into mechanical energy

Mechanical energy into hydraulic energy

Hydraulic energy into mechanical energy

Which of the following statements is correct ? [MPSC : 2015] *

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Pelton wheel is a reaction turbine

Pelton wheel is a radial flow turbine

Pelton wheel is an impulse turbine

None of the above

Operating characteristic curves of a turbine are : [MPSC : 2015] *

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Varying speed curves

Constant efficiency curves

Constant speed curves

Constant head curves

What is the range of the speed ratio for a Francis Turbine ? [MPSC : 2017] *

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0.60 to 0.90

0.85 to 0.90

0.10 to 0.30

1.40 to 2.25

For high head, the suitable turbine is [MPSC : 2017] *

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Pelton

Francis

None of the above

Kaplan

Which of the following statements is correct ? [MPSC : 2017] *

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Curves at constant speed are called main characteristics curves.

Curves at constant efficiency are called operating characteristic curves.

Curves at constant efficiency are called main characteristic curves.

Curves at constant head are called main characteristic curves.

Jet ratio (m) is defined as the ratio of [MPSC : 2017] *

1 point

Velocity of flow to velocity of the jet of water

Velocity of vane to velocity of the jet of water

Diameter of the jet of water to diameter of the Pelton wheel

Diameter of Pelton wheel to diameter of the jet of water

Kaplan turbine is a/an [MPSC : 2018] *

1 point

axial flow reaction turbine

impulse turbine

radial flow impulse turbine

radial flow reaction turbine

In the inlet part of the jet impinging on a Pelton bucket, the velocity of whirl V𝓌₁ is equal to [MPSC : 2018] *

1 point

absolute velocity of jet at inlet V₁

relative velocity of jet at inlet Vr₁

None of the above

zero

Which component is not provided to Pelton wheel turbine ? [MPSC : 2018] *

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Jet

Casing

Penstock

Draft tube

Which principle is used in Hydraulic Turbines? *

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Charles law

Braggs law

Faraday law

Newton’s second law

Which kind of turbine is a Fourneyron Turbine? *

1 point

Inward flow turbine

Radial flow turbine

Outward flow turbine

Mixed flow turbine

Maximum Number of jets, generally, employed in an impulse turbine without jet interference can be? [SSC : JE : 2016] *

1 point

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