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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 5

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