### Hydraulics And Fluid Mechanics Set 5

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.
• 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