Among the following which turbine has least efficiency?

1.Pelton turbine

2.Kaplan turbine

3.Francis turbine

4.Propeller turbine

Among the following which turbine requires more head?

1.Pelton Turbine

2.Kaplan Turbine

3.Francis turbine

4.Tube Turbine

Calculate work done by jet per second on the runner where, discharge=0.7cubic meters/s, inlet and outlet whirl velocities be 23.77 and 2.94?

1.200Kw

2.150Kw

3.187Kw

4.250Kw

Design of Pelton wheel means the following data is to be determined.

1.Width of buckets

2.Depth of buckets

3.Number of buckets

4.All of the mentioned

Find the diameter of jet D, if jet ratio m and diameter of jet d are given as 10 and 125mm.

1.1.25 meters

2.1.5 meters

3.2 meters

4.1.2 meters

Head lost due to friction is given by k*f*L*v*v/D*2g where f- friction coefficient, L- length of pen stock, D- diameter of penstock andâ€ kâ€ is constant and its value is ____________

1.2

2. 3

3.4

4.5

Head under which Francis turbine is operated?

1.10-70 meters

2.70-100 meters

3.100-200 meters

4.40-600 meters

Head under which Kaplan turbine is operated______

1.10-70 meters

2.70 -100 meters

3.100-200 meters

4.Above 200 meters

If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate number of buckets on Pelton wheel approximately

1.20

2.22

3.23

4. 25

If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate width of buckets.

1.400mm

2.500mm

3. 420mm

4.425mm

If diameter of jet is 85mm and diameter of runner is 1.5 meter then depth of buckets is ___________

1.100mm

2.105mm

3.106mm

4.102mm

In most of cases the value of jet ratio is _______________

1.10

2.11

3.12

4.13

In Pelton turbine product of mechanical efficiency and hydraulic efficiency is known as _____________

1.Mechanical efficiency

2.Volumetric efficiency

3.Hydraulic efficiency

4.Overall efficiency

In Pelton turbine the energy available at inlet of runner that is at outlet of nozzle is known as

1.Shaft power

2.Runner power

3.Output power

4.Water power

In Pelton turbine the ratio of volume available at shaft of turbine and power supplied at the inlet of the turbine is _______

1.Mechanical efficiency

2.Volumetric efficiency

3.Hydraulic efficiency

4.Overall efficiency

In Pelton turbine ___________ is defined as ratio between power delivered to runner and power supplied at inlet of turbine.

1.Mechanical efficiency

2.Volumetric efficiency

3.Hydraulic efficiency

4.Overall efficiency

In Pelton turbines the expression for power delivered at inlet to runner is given by __________

1.W*[Vw1+Vw2]u/g

2.W*[Vw1-Vw2]u/g

3.W*[Vw1+Vw2]u/g, W*[Vw1-Vw2]u/g

4.[Vw1+Vw2]u/g

In Pelton wheel if angle of deflection is not mentioned then we assume it as______________

1.150 degrees

2.200 degrees

3.165 degrees

4.185 degrees

In Pelton wheel, if outlet velocity angle of jet is â€œacute angledâ€ then outlet whirl velocity of jet is ______________

1.x- component of V(r2) â€“ blade velocity

2.x- component of V (r2) + blade velocity

3.Blade velocity â€“ x- component of V (r2)

4.Zero

In Pelton wheel, if outlet velocity angle of jet is â€œobtuseangledâ€ then outlet whirl velocity of jet is _____________

1.x- component of V (r2) â€“ blade velocity

2.x- component of V (r2) + blade velocity

3.Blade velocity â€“ x- component of V (r2)

4.Zero

In Pelton wheel, if outlet velocity angle of jet is â€œright angledâ€ then outlet whirl velocity of jet is __________

1.x- component of V (r2) â€“ blade velocity

2.x- component of V (r2) + blade velocity

3.Blade velocity â€“ x- component of V (r2)

4. Zero

In Pelton wheel, relative inlet velocity of jet with respect to velocity of vane is _____________

1.Difference between inlet jet velocity and blade velocity

2.Sum of inlet jet velocity and blade velocity

3. Inlet jet velocity

4.Blade velocity

In Pelton ____________ is ratio of volume of water actually striking the runner and volume of water supplied to turbine.

1.Mechanical efficiency

2.Volumetric efficiency

3.Hydraulic efficiency

4.Overall efficiency

In which of following turbine inlet and outlet blade velocities of vanes are equal?

1.Francis turbine

2.Kaplan turbine

3.Pelton turbine

4.Propeller turbine

In which of following turbine inlet whirl velocity and inlet jet velocity are equal in magnitude?

1.Pelton turbine

2.Propeller turbine

3.Kaplan turbine

4.Francis turbine

Kinetic energy of jet at inlet of turbine is given as __________________

1.0.5(paV1)*V1

2.0.5(paV1)*V1*V1

3.0.5(aV1)*V1*V1

4. 0.5(pV1)*V1*V1

Number of buckets on runner of Pelton wheel is given by expression? (D-diameter of runner and d- diameter of jet)

1.15 + D/2d

2.15 + 3D/2d

3.15 + D/d

4.15 + 2D/d

Tangential velocity of blade of Pelton wheel is proportional to ____________

1.Speed of wheel

2.Angular velocity of wheel

3.Rpm of wheel

4.Speed, angular velocity, RPM of the wheel

The depth of buckets of Pelton wheel ____________

1.1.2 times diameter of jet

2.1.3 times diameter of jet

3.1.4 times diameter of jet

4.1.5 times diameter of jet

The difference between gross head and friction losses is ____________

1.Net head

2.Gross head

3.Manometric head

4.Net positive suction head

The expression for maximum hydraulic efficiency of Pelto turbine is given by ______________

1.(1+cos k)/2 where k is outlet blade angle

2.(2+cos k)/2 where k is outlet blade angle

3.(3+cos k)/2 where k is outlet blade angle

4.(4+cos k)/2 where k is outlet blade angle

The expression for water power in Pelton wheel is ________________

1.(P*g*Q*H) Kw

2.(g*Q*H*a) Kw

3.(g*Q) Kw

4.(g*H) Kw

The force exerted by a jet of water in the direction of jet of jet on a stationary curved plates Fx is ____________

1.pav*v

2.pav

3.pav*v(1+cos k)

4.pav*v(1+sin k)

The force exerted by a jet of water in the direction of jet of jet on moving curved plates is ___________

1.pa(v-u)*(v-u)

2.pa(v-u)

3.pav*(v-u)(1+cos k)

4.pa(v-u)*(v-u)(1+sin k)

The head available at inlet of turbine is ____________

1.Net positive suction head

2.Gross head

3.Net head

4.Manometric head

The hydraulic efficiency of Pelton turbine will be maximum when blade velocity is equal to _______

1.V/2

2.V/3

3.V/4

4.V/5

The maximum efficiency of Pelton turbine is _________

1.80%

2.70%

3.50%

4.88%

The number of buckets of Pelton wheel is 25 and diameter of runner is 1.5meters then calculate diameter of jet is ___________

1.80mm

2.85mm

3.90mm

4. 82mm

The power supplied at inlet of turbine in S.I units is known as_____________

1.Shaft power

2.Runner power

3.Water power

4.Total power

The ratio of diameter of jet to diameter of runner is _____________

1.1:3

2. 1:6

3.1:5

4.3:4

The ratio of pitch diameter of Pelton wheel to diameter of jet is known as ___________

1.Speed ratio

2.Jet ratio

3.Velocity ratio

4.Co-efficient of velocity

The turbine is preferred for 0 to 25 m head of water?

1.Pelton wheel

2.Kaplan turbine

3.Tube turbine

4.Francis turbine

The value of coefficient of velocity is _____________

1.0.98

2.0.65

3.0.85

4.0.33

The width of buckets of Pelton wheel is _________________

1.2 times diameter of jet

2.3 times diameter of jet

3.4 times diameter of jet

4.5 times diameter of jet

The work done per unit weight of water jet striking runner blades of Pelton turbine is given by expression ______________

1.[Vw1+Vw2] u/g

2.Vw1*u/g

3.[Vw1+Vw2]/g

4.[Vw1+Vw2]u

Total head of turbines is_______

1.Pressure head + Static head

2.Kinetic head + Static head

3.Static head + Pressure head

4.Pressure head + Kinetic head + Static head

Under what head is Pelton turbine operated?

1.20-50 meters

2.15-2000 meters

3.60-200 meters

4.50-500 meters

Velocity triangles are used to analyze ____________

1.Flow of water along blades of turbine

2.Measure discharge of flow

3.Angle of deflection of jet

4.Flow of water, measure of discharge, angle of deflection

____________ is obtained by dividing total rate of flow through the turbine by rate of flow through single jet.

1.Number of jets

2.Diameter of jets

3.Velocity of jets

4.Speed ratio

_____________ is difference between head race and tail race.

1.Gross head

2.Net head

3.Net positive suction head

4.Manometric head

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