# Engineering-Hydraulic Machines MCQs Set/2 Sample Test,Sample questions

## Question: ```Among the following which turbine has least efficiency? ```

1.Pelton turbine

2.Kaplan turbine

3.Francis turbine

4.Propeller turbine

## Question: ```Among the following which turbine requires more head? ```

1.Pelton Turbine

2.Kaplan Turbine

3.Francis turbine

4.Tube Turbine

1.200Kw

2.150Kw

3.187Kw

4.250Kw

## Question: ```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

1.1.25 meters

2.1.5 meters

3.2 meters

4.1.2 meters

1.2

2. 3

3.4

4.5

1.10-70 meters

2.70-100 meters

3.100-200 meters

4.40-600 meters

## Question: ```Head under which Kaplan turbine is operated______ ```

1.10-70 meters

2.70 -100 meters

3.100-200 meters

4.Above 200 meters

1.20

2.22

3.23

4. 25

1.400mm

2.500mm

3. 420mm

4.425mm

1.100mm

2.105mm

3.106mm

4.102mm

1.10

2.11

3.12

4.13

## Question: ```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

1.Shaft power

2.Runner power

3.Output power

4.Water power

## Question: ```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

## Question: ```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

## Question: ```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

1.150 degrees

2.200 degrees

3.165 degrees

4.185 degrees

## Question: ```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

## Question: ```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

## Question: ```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

## Question: ```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

## Question: ```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

## Question: ```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

## Question: ```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

## Question: ```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

1.15 + D/2d

2.15 + 3D/2d

3.15 + D/d

4.15 + 2D/d

## Question: ```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

## Question: ```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

## Question: ```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

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

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

3.(g*Q) Kw

4.(g*H) Kw

1.pav*v

2.pav

3.pav*v(1+cos k)

4.pav*v(1+sin k)

## Question: ```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)

1.V/2

2.V/3

3.V/4

4.V/5

1.80%

2.70%

3.50%

4.88%

1.80mm

2.85mm

3.90mm

4. 82mm

1.Shaft power

2.Runner power

3.Water power

4.Total power

1.1:3

2. 1:6

3.1:5

4.3:4

## Question: ```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

## Question: ```The turbine is preferred for 0 to 25 m head of water? ```

1.Pelton wheel

2.Kaplan turbine

3.Tube turbine

4.Francis turbine

1.0.98

2.0.65

3.0.85

4.0.33

## Question: ```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

1.[Vw1+Vw2] u/g

2.Vw1*u/g

3.[Vw1+Vw2]/g

4.[Vw1+Vw2]u

1.20-50 meters

2.15-2000 meters

3.60-200 meters

4.50-500 meters

## Question: ```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

## Question: ```____________ 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