 Home » Mechanical Engineering » Mechanical Engineering MCQ » Hydraulics And Fluid Mechanics • BStreamline
• CTurbulent

Explanation:

• ARectangular
• BTriangular
• CTrapezoidal
• DCircular

Trapezoidal

Explanation:

### 3.A hydraulic ram is a device used to

• AStore the energy of water
• BIncrease the pressure of water
• CTo lift water from deep wells
• DTo lift small quantity of water to a greater height when a large quantity of water is available at a smaller height

To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height

Explanation:

### 4.According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to

• AThe weight of the body
• BMore than the weight of the body
• CLess than the weight of the body
• DWeight of the fluid displaced by the body

Weight of the fluid displaced by the body

Explanation:

### 5.The tangential velocity of the water element having a free vortex is

• ADirectly proportional to its distance from the centre
• BInversely proportional to its distance from the centre
• CDirectly proportional to its distance2 from the centre
• DInversely proportional to its distance2 from the centre

Inversely proportional to its distance from the centre

Explanation:

### 6.The buoyancy depends upon the

• AWeight of the liquid displaced
• BPressure with which the liquid is displaced
• CViscosity of the liquid
• DCompressibility of the liquid

Weight of the liquid displaced

Explanation:

### 7.The magnitude of water hammer depends upon the

• AElastic properties of the pipe material
• BElastic properties of the liquid flowing through the pipe
• CSpeed at which the valve is closed
• DAll of the above

All of the above

Explanation:

• BThree times
• CFour times
• DFive times

Five times

Explanation:

• AEqual to
• B1.2 times
• C1.8 times
• DDouble

1.2 times

Explanation:

### 10.The speed of sound in a ideal gas varies directly as it’s

• AAbsolute temperature
• BTemperature
• CDensity
• DModulus of elasticity

Absolute temperature

Explanation:

• Ap = T × r
• Bp = T/r
• Cp = T/2r
• Dp = 2T/r

p = 2T/r

Explanation:

### 12.When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as

• ACentre of pressure
• BCentre of gravity
• CCentre of buoyancy
• DMetacentre

Metacentre

Explanation:

### 13.Fluid is a substance that

• ACannot be subjected to shear forces
• BAlways expands until it fills any container
• CHas the same shear stress at a point regardless of its motion
• DCannot remain at rest under action of any shear force

Cannot remain at rest under action of any shear force

Explanation:

### 14.The line of action of the buoyant force acts through the

• ACentroid of the volume of fluid vertically above the body
• BCentre of the volume of floating body
• CCenter of gravity of any submerged body
• DCentroid of the displaced volume of fluid

Centroid of the displaced volume of fluid

Explanation:

### 15.If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have

• AGeometric similarity
• BKinematic similarity
• CDynamic similarity
• DNone of these

Geometric similarity

Explanation:

### 16.Meta-centric height is given as the distance between

• AThe center of gravity of the body and the metacenter
• BThe center of gravity of the body and the center of buoyancy
• CThe center of gravity of the body and the center of pressure
• DCenter of buoyancy and metacenter

The center of gravity of the body and the metacenter

Explanation:

### 17.When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as

• BTurbulent flow
• CVortex flow
• DUniform flow

Vortex flow

Explanation:

### 18.Non uniform flow occurs when

• AThe direction and magnitude of the velocity at all points are identical
• BThe velocity of successive fluid particles, at any point, is the same at successive periods of time
• CVelocity, depth, pressure, etc. change from point to point in the fluid flow
• DThe fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane

Velocity, depth, pressure, etc. change from point to point in the fluid flow

Explanation:

• AThe direction and magnitude of the velocity at all points are identical
• BThe velocity of successive fluid particles, at any point, is the same at successive periods of time
• CThe magnitude and direction of the velocity do not change from point to point in the fluid
• DThe fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane

The velocity of successive fluid particles, at any point, is the same at successive periods of time

Explanation:

### 20.True one-dimensional flow occurs when

• AThe direction and magnitude of the velocity at all points are identical
• BThe velocity of successive fluid particles, at any point, is the same at successive periods of time
• CThe magnitude and direction of the velocity do not change from point to point in the fluid
• DThe fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane