Hydraulics And Fluid Mechanics Set 5 MCQs

Q1 | Unit of surface tension is

Energy/unit area

Velocity/unit area

Both of the above

It has no units

Q2 | A Piezometer tube is used only for measuring

Low pressure

High pressure

Moderate pressure

Vacuum pressure

Q3 | The Cipoletti weir is a __________ weir.

Rectangular

Triangular

Trapezoidal

Circular

Q4 | Pressure of the order of 10" torr can be measured by

Bourdon tube

Pirani Gauge

Micro -manometer

Lonisation gauge

Q5 | The volume of a fluid __________ as the pressure increases.

Remains same

Decreases

Increases

None of these

Q6 | Buoyant force is

The resultant force acting on a floating body

The resultant force on a body due to the fluid surrounding it

Equal to the volume of liquid displaced

The force necessary to maintain equilibrium of a submerged body

Q7 | A flow through a long pipe at decreasing rate is called __________ uniform flow.

Steady

Unsteady

Both A and B

None of these

Q8 | Choose the wrong statement

The center of buoyancy is located at the center of gravity of the displaced liquid

For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy

If C.G. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions

All floating bodies are stable

Q9 | The intensity of pressure at any point, in a liquid, is __________ to the depth of liquid from the surface.

Equal

Directly proportional

Inversely proportional

None of these

Q10 | The discharge in an open channel corresponding to critical depth is

Zero

Minimum

Maximum

None of these

Q11 | A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. Thespecific gravity of wood is

0.83

0.6

0.4

0.3

Q12 | A pitot tube is used to measure the

Velocity of flow at the required point in a pipe

Pressure difference between two points in a pipe

Total pressure of liquid flowing in a pipe

Discharge through a pipe

Q13 | The total energy of each particle at various places in the case of perfect incompressible fluidflowing in continuous stream

Keeps on increasing

Keeps on decreasing

Remain constant

May increase/decrease

Q14 | The critical depth meter is used to measure

Velocity of flow in an open channel

Depth of flow in an open channel

Hydraulic jump

Depth of channel

Q15 | Two pipe systems can be said to be equivalent, when the following quantities are same

Friction loss and flow

Length and diameter

Flow and length

Friction factor and diameter

Q16 | In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome theviscous resistance will be

Double

Four times

Eight times

Sixteen times

Q17 | The value of bulk modulus of a fluid is required to determine

Reynold's number

Froude's number

Mach number

Euler's number

Q18 | Fluid is a substance which offers no resistance to change of

Pressure

Flow

Shape

Volume

Q19 | The pressure less than atmospheric pressure is known as

Suction pressure

Vacuum pressure

Negative gauge pressure

All of these

Q20 | 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

Q21 | The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)

w × Q × H

w × Q × hf

w × Q (H - hf)

w × Q (H + h )

Q22 | A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

Length of both the pipes is same

Diameter of both the pipes is same

Loss of head and discharge of both the pipes is same

Loss of head and velocity of flow in both the pipes is same

Q23 | The center of gravity of the volume of the liquid displaced by an immersed body is called

Metacentre

Center of pressure

Center of buoyancy

Center of gravity

Q24 | A flow is called sub-sonic, if the Mach number is

Less than unity

Unity

Between 1 and 6

More than 6

Q25 | Barometer is used to measure

Pressure in pipes, channels etc.

Atmospheric pressure

Very low pressure

Difference of pressure between two points