# Engineering-Hydraulic Machines MCQs Set/4 Sample Test,Sample questions

## Question: ```A turbine is a ________ ```

1.Rotary mechanical device

2.Static pressure drop device

3.Electrical device

4.Static temperature device

1.D1 > D2

2.D1 < D2

3.D1 = D2

4.D1 = D2 = 0

1.Vane angle

2.Nozzle

3. Pump

4.Pipe

## Question: ```Centrifugal flow is imparted when the__________ ```

1.Reaction flow is negative

2.Reaction flow is positive

3.Efficiency is 100 percent

4.Reaction rate is negligible

1.0

2.1

3.2

4.3

## Question: ```Degree of reaction for reaction turbine is _____________ ```

1.1- cot x /2(cot x â€“cot y)

2.1+ cot x /2(cot x â€“cot y)

3.1- cot x /2(cot x +cot y)

4. 1+ cot x /2(cot x +cot y)

1.Increases

2.Decreases

3.Same

4.Independent

1.Increases

2.Decreases

3.Same

4. Independent

## Question: ```In impulse turbines with moving blades, there is no _________ in blades of the turbine. ```

1.Pressure change

2.Same pressure

3.Volumetric change

4.Pressure independent

## Question: ```In impulse turbines with stationary blades, there is_________ in blades of the turbine. ```

1.Pressure change

2.Same pressure

3.Volumetric change

4.Pressure independent

## Question: ```In which of the following type of runners the velocity of whirl at inlet is greater than the blade velocity? ```

1.Such a case is practically impossible

2.Slow Runner

3.Medium Runner

4.Fast Runner

## Question: ```Inward flow reaction turbine enter through ______ ```

1.Outer periphery

3. Inner periphery

4.Pressure angle

1.40

2.60

3.80

4.25

## Question: ```The formula for degree of reaction for hydraulic turbines is __________ ```

1.1- (V1*V1-V2*V2)/(V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1)

2.(V1*V1-V2*V2)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1)

3.1+ (V1*V1-V2*V2)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1)

4.1- (V2*V2-V1*V1)/ (V1*V1-V2*V2)*(u1*u1-u2*u2)*(Vr2*Vr2-Vr1*Vr1)

1.60

2. 70

3.80

4. 90

## Question: ```The Pelton wheel extracts energy from________ ```

1.Vane angle

2.Moving fluid

3.Increase in temperature

4.Heat rejection

1.80%

2.90%

3.70%

4.98%

## Question: ```Turbine converts _________ ```

1.Work to energy

2.Energy to work

3.Work to Electricity

4.Work to pressure

## Question: ```Turbine extracts energy from________ ```

1.Reaction ratio

2.Pressure ratio

3.Fluid flow

4.Volumetric ratio

## Question: ```What is the water flow direction in the runner in a Francis turbine? ```

1.Axial and then tangential

2.Tangential and then axial

1.Solar power

2.Windmill

3.Water wheels

4. Gas plant

## Question: ```Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft of the turbine to the power produced by the runner? ```

1.Hydraulic efficiency

2.Volumetric efficiency

3.Mechanical efficiency

4.Overall efficiency

## Question: ```Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft to the power supplied by water at the inlet? ```

1.Hydraulic efficiency

2.Volumetric efficiency

3.Mechanical efficiency

4.Overall efficiency

## Question: ```Which of the following efficiencies for Francis Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet? ```

1.Hydraulic efficiency

2.Volumetric efficiency

3.Mechanical efficiency

4.Overall efficiency

## Question: ```Which of the following efficiencies for Francis Turbine is described as the ratio between total quantity of water over runner blades to total quantity of water supplied to turbine? ```

1.Hydraulic efficiency

2.Volumetric efficiency

3.Mechanical efficiency

4.Overall efficiency

## Question: ```Which of the following profiles are used for guide vanes to ensure smooth flow without separation? ```

1.Rectangular

2.Bent Rectangular

3.Elliptical

4.Aerofoil

## Question: ```Which of the following runner types will have the highest vane angle at inlet (Î²1 value)? ```

1.Slow Runner

2.Medium Runner

3.Fast Runner

4.Vane angle is defined only for Kaplan Turbines and not Francis turbines

## Question: ```Why does the cross sectional area of the Spiral casing gradually decrease along the circumference of the Francis turbine from the entrance to the tip? ```

1.To ensure constant velocity of water during runner entry

2.To prevent loss of efficiency of the turbine due to impulsive forces caused by extra area

3.To prevent leakage from the turbine

4.To reduce material costs in order to make the turbine more economical

## Question: ```___________is ratio of pressure energy change inside runner to total energy change inside runner ```

1.Degree of reaction

2.Speed ratio

3.Flow ratio

4.Hydraulic efficiency

## More MCQS

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