A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow.
Incompressible
Compressible
Viscous
None of these
Correct Answer :
A. Incompressible
Related Questions
The line of action of the buoyant force acts through the Centroid of the
Submerged body
Volume of the floating body
Volume of the fluid vertically above the body
Displaced volume of the fluid
Alcohol is used in manometers because
It has low vapour pressure
It is clearly visible
It has low surface tension
It can provide longer column due to low density
The unit of viscosity is
Metres² per sec
kg-sec/metre
Newton-sec per metre²
Newton-sec per meter
The normal stress in a fluid will be constant in all directions at a point only if
It is incompressible
It has uniform viscosity
It has zero viscosity
It is at rest
The purpose of a surge tank is
To control the pressure variations due to rapid changes in the pipe line flow
To eliminate water hammer possibilities
To regulate flow of water to turbines by providing necessary retarding head of water
All of the above
The value of mass density in kg-sec-V-m⁴ for water at 0°C is
1
1000
100
101.9
The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the submerged body is called
Up-thrust
Reaction
Buoyancy
Metacentre
When a liquid is flowing through a pipe, the velocity of the liquid is
Maximum at the centre and minimum near the walls
Minimum at the centre and maximum near the walls
Zero at the centre and maximum near the walls
Maximum at the centre and zero near the walls
The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is
200 kg/m3
400 kg/m3
600 kg/m3
800 kg/m3
An open vessel of water is accelerated up an inclined plane. The free water surface will
Be horizontal
Make an angle in direction of inclination of inclined plane
Make an angle in opposite direction to inclination of inclined plane
Any one of above is possible
Manometer is used to measure
Pressure in pipes, channels etc.
Atmospheric pressure
Very low pressure
Difference of pressure between two points
An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.
Equal to
Directly proportional
Inversely proportional
None of these
A flow in which the viscosity of fluid is dominating over the inertia force is called
Steady flow
Unsteady flow
Laminar flow
Turbulent flow
A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is
400 kg/cm²
4000 kg/cm²
40 × 10⁵ kg/cm²
40 × 10⁶ kg/cm²
The units of kinematic viscosity are
Metres² per sec
kg sec/metre
Newton-sec per metre
Newton-sec per metre
Buoyant force is
Resultant force acting on a floating body
Equal to the volume of liquid displaced
Force necessary to keep a body in equilibrium
The resultant force on a body due to the fluid surrounding it
Operation of McLeod gauge used for low pressure measurement is based on the principle of
Gas law
Boyle's law
Charles law
Pascal's law
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be
2A × √H₁/Cd × a × √(2g)
2A × √H₂/Cd × a × √(2g)
2A × (√H₁ - √H₂)/Cd × a × √(2g)
2A × (√H3/2 - √H3/2)/Cd × a × √(2g)
One poise is equal to
0.1 N-s/m2
1 N-s/m2
10 N-s/m2
100 N-s/m2
The maximum efficiency of transmission through a pipe is
50 %
56.7 %
66.67 %
76.66 %
A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow.
Incompressible
Compressible
Viscous
None of these
True one-dimensional flow occurs when
The direction and magnitude of the velocity at all points are identical
The velocity of successive fluid particles, at any point, is the same at successive periods of time
The magnitude and direction of the velocity do not change from point to point in the fluid
The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane
A flow in which __________ force is dominating over the viscosity is called turbulent flow.
Elastic
Surface tension
Viscous
Inertia
The total head of a liquid particle in motion is equal to
Pressure head + kinetic head + potential head
Pressure head - (kinetic head + potential head)
Potential head - (pressure head + kinetic head)
Kinetic head - (pressure head + potential head)
A perfect gas
Has constant viscosity
Has zero viscosity
Is in compressible
None of the above
Fluid is a substance that
Cannot be subjected to shear forces
Always expands until it fills any container
Has the same shear stress at a point regardless of its motion
Cannot remain at rest under action of any shear force
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be
500 kg
1000 kg
1500 kg
2000 kg
The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.
Equal to
Less than
More than
None of these
The absolute pressure is equal to
Gauge pressure + atmospheric pressure
Gauge pressure - atmospheric pressure
Atmospheric pressure - gauge pressure
Gauge pressure - vacuum pressure
A fluid is said to be ideal, if it is
Incompressible
Viscous and incompressible
Inviscous and compressible
Inviscous and incompressible