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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

Question:

An outward flow reaction turbine, ________

1.D1 > D2

2.D1 < D2

3.D1 = D2

4.D1 = D2 = 0

Question:

Before reaching the turbine, the acceleration of the fluid takes place through the__________

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

Question:

Degree of reaction for impulse turbine

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)

Question:

In an inward flow reaction turbine the discharge _______

1.Increases

2.Decreases

3.Same

4.Independent

Question:

In an outward flow reaction turbine the discharge _______

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

2.Blades

3. Inner periphery

4.Pressure angle

Question:

The desired hydraulic efficiency of a turbine is 80% at a whirl velocity of 20 m/s and a head of 100 m. What should be the blade velocity of the turbine at inlet in m/s?

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)

Question:

The input water power of the Francis turbine is 1.25 times the runner power. What would be the hydraulic efficiency of the turbine (in %)?

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

Question:

The whirl velocity at inlet of Francis turbine is given to be 20 m/s. The blade velocity is given as 35 m/s. What is the hydraulic efficiency for a head of 100 m?

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

3.Radial and then axial

4.Axial and then radial

Question:

Where is the turbine not used?

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 is true in case of flow of water before it enters the runner of a Francis Turbine?

1.Available head is entirely converted to velocity head

2.Available head is entire converted to pressure head

3.Available head is neither converted to pressure head nor velocity head

4.Available head is partly converted to pressure head and partly to velocity head

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

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

Question:
A turbine is a ________

Question:
An outward flow reaction turbine, ________

Question:
Before reaching the turbine, the acceleration of the fluid takes place through the__________

Question:
Centrifugal flow is imparted when the__________

Question:
Degree of reaction for impulse turbine

Question:
Degree of reaction for reaction turbine is _____________

Question:
In an inward flow reaction turbine the discharge _______

Question:
In an outward flow reaction turbine the discharge _______

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

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

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

Question:
Inward flow reaction turbine enter through ______

Question:
The desired hydraulic efficiency of a turbine is 80% at a whirl velocity of 20 m/s and a head of 100 m. What should be the blade velocity of the turbine at inlet in m/s?

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

Question:
The input water power of the Francis turbine is 1.25 times the runner power. What would be the hydraulic efficiency of the turbine (in %)?

Question:
The Pelton wheel extracts energy from________

Question:
The whirl velocity at inlet of Francis turbine is given to be 20 m/s. The blade velocity is given as 35 m/s. What is the hydraulic efficiency for a head of 100 m?

Question:
Turbine converts _________

Question:
Turbine extracts energy from________

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

Question:
Where is the turbine not used?

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?

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?

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?

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?

Question:
Which of the following is true in case of flow of water before it enters the runner of a Francis Turbine?

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

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

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?

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

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