Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering

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31.
The specific speed of turbine is defined as the speed of a unit

A. Of such a size that it delivers unit discharge at unit head

B. Of such a size that it delivers unit discharge at unit power

C. Of such a size that it requires unit power per unit head

D. Of such a size that it produces unit horse power with unit head

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32.
The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece and H = Height of liquid above the mouthpiece)

A. $$0.855{\text{a}}\sqrt {2{\text{gH}}} $$

B. $$1.855{\text{aH}}\sqrt {2{\text{g}}} $$

C. $$1.585{\text{a}}\sqrt {2{\text{gH}}} $$

D. $$5.85{\text{aH}}\sqrt {2{\text{g}}} $$

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33.
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece and H = Height of liquid above the mouthpiece)

A. $$0.5{\text{a}}\sqrt {2{\text{gH}}} $$

B. $$0.707{\text{a}}\sqrt {2{\text{gH}}} $$

C. $$0.855{\text{a}}\sqrt {2{\text{gH}}} $$

D. $${\text{a}}\sqrt {2{\text{gH}}} $$

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34.
A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

A. Equal to

B. Less than

C. More than

D. None of these

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35.
A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.

A. Equal to

B. Less than

C. More than

D. None of these

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36.
Braking jet in an impulse turbine is used

A. To break the jet of water

B. To bring the runner to rest in a short time

C. To change the direction of runner

D. None of these

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37.
Rotameter is a device used to measure

A. Absolute pressure

B. Velocity of fluid

C. Flow

D. Rotation

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38.
In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

A. Less than

B. More than

C. Equal to

D. None of these

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39.
In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

A. Less than

B. More than

C. Equal to

D. None of these

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40.
Choose the wrong statement

A. Fluids are capable of flowing

B. Fluids conform to the shape of the containing vessels

C. When in equilibrium, fluids cannot sustain tangential forces

D. When in equilibrium, fluids can sustain shear forces

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Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering

31. The specific speed of turbine is defined as the speed of a unit

Answer & Solution

32. The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece and H = Height of liquid above the mouthpiece)

Answer & Solution

33. When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece and H = Height of liquid above the mouthpiece)

Answer & Solution

34. A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

Answer & Solution

35. A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.

Answer & Solution

36. Braking jet in an impulse turbine is used

Answer & Solution

37. Rotameter is a device used to measure

Answer & Solution

38. In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

Answer & Solution

39. In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

Answer & Solution

40. Choose the wrong statement

Answer & Solution

Read More Section(Hydraulics and Fluid Mechanics in ME)

31.
The specific speed of turbine is defined as the speed of a unit

32.
The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece and H = Height of liquid above the mouthpiece)

33.
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece and H = Height of liquid above the mouthpiece)

34.
A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

35.
A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.

36.
Braking jet in an impulse turbine is used

37.
Rotameter is a device used to measure

38.
In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

39.
In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

40.
Choose the wrong statement