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Q1. | The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is |

A. | 1/3 [Correct Answer] |

B. | 1/4 [Wrong Answer] |

C. | 1/2 [Wrong Answer] |

D. | 2/3 [Wrong Answer] |

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**Also Read Similar Questions Below :**

⇒ The hydraulic grade line is.

always above the centre line of pipe

never above the energy grade line

always sloping downward in the direction of flow

all of the above

⇒ Flow in a pipe is laminar if the Reynold's number is

Less than 2000

Between 2000 and 4000

Between 4000 and 6000

Equal to 10000

⇒ For laminar flow in a pipe of circular cross-section, the Darcy's friction factor f is

directly proportional to Reynolds number and independent of pipe wall roughness

directly proportional to pipe wall roughness and independent of Reynolds number

inversely proportional to Reynolds number and indpendent of pipe wall roughness

inversely proportional to Reynolds number and directly proportional to pipe wall roughness

⇒ The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is

at the centroid of the submerged area

always above the centroid of the area

always below the centroid of the area

none of the above

⇒ The viscosity of a gas.

decreases with increase in temperature

increases with increase in temperature

is independent of temperature

is independent of pressure for very high pressure intensities

⇒ At vena contracta jet has the minimum area of cross section and so the velocity of liquid at this section will be

Minimum

Maximum

Average

Zero

⇒ When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is

L/4

L/3

L/2

L

⇒ The water jet after striking a stationary flat plate will be deflected at an angle of

60°

90°

110°

135°

⇒ A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be.

less than 1 m/sec

1 m/sec

1.5 m/sec

2 m/sec

⇒ Manometer is used to measure

Velocity of liquid

Atmospheric pressure

Pressure in pipe and channels

Pressure in venturimeter

⇒ A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be

1 m

10m

100m

none of the above

⇒ The friction drag is more than pressure drag for

A sphere

A streamlined body

A circular disc placed normal to the flow direction

An air foil

⇒ An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to.

g/3

g/2

2g/3

g

⇒ The point at which the resultant pressure on an immersed surface acts is known as

Centre of gravity

Centre of depth

Centre of pressure

Centre of immersed surface

⇒ Stream lines and path lines always coincide in case of.

steady flow

steady flow

uniform flow

turbulent flow

⇒ In series-pipe problems

the head loss is same through each pipe

the discharge is same through each pipe

a trial solution is not necessary

the discharge through each pipe is added to obtain total discharge

⇒ It is easier to swim in sea water than in river water because

Sea is wider than the river

Sea is deeper than the river

Density of sea water is greater than that of river

Sea is having high waves all the time

⇒ Pascal-second is the unit of.

pressure

kinematic viscosity

dynamic viscosity

surface tension

⇒ Coefficient of velocity for Borda's mouth piece running full is.

0.611

0.707

0.855

1.00

⇒ The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is

32 km

20 km

8 km

4 km

⇒ Separation of flow occurs when.

the pressure intensity reaches a minimum

the cross-section of a channel is reduced

the boundary layer comes to rest

all of the above

⇒ When the depth of flow changes abruptly over a short distance, then the flow will be termed as

Rapidly varied flow

Unsteady flow

Gradually varied flow

Turbulent flow

⇒ In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is

22.5 m/sec.

33 m/sec.

40 m/sec.

90 m/sec.

⇒ The increase in meta centric height

i) increases stability

ii) decreases stability

iii) increases comfort for passengers

iv) decreases comfort for passengers

The correct answer is

(i) and (iii)

(i)and(iv)

(ii) and (iii)

(ii) and (iv)

⇒ Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is

less than d

between d and 1.5 d

between 1.5 d and 2d

greater than 2d

⇒ A gale blows over a house. The force due to the gale on the roof is

Downward

Upward

Horizontal

Zero

⇒ The ratio of friction drag to pressure drag is

1/3

2/3

1

2

⇒ Hot wire anemometer is used to measure

discharge

velocity of gas

pressure intensity of gas

pressure intensity of liquid

⇒ When an ideal fluid flows past a sphere,

highest intensity of pressure occurs around the circumference at right angles to flow

lowest pressure intensity occurs at front stagnation point

lowest pressure intensity occurs at rear stagnation point

total drag is zero

⇒ If a vessel containing liquid moves downward with a constant acceleration equal to 'g' then.

the pressure throughout the liquid mass is atmospheric

there will be vacuum in the liquid

the pressure in the liquid mass is greater than hydrostatic pressure

none of the above