  ## Hydraulics MCQ Practice Questions (Civil Engineering) Set 7

##### The best side slope for most economical trapezoidal section, is:

Options are :

• None of these
• 60�
• 30�
• 45�

Options are :

• 60 m
• 40 m
• 15 m
• 20 m
• 30 m

##### In Chezy's formula V = C ?mi

Options are :

• All the above
• m is the hydraulic mean depth
• V is the mean velocity of flow
• i is the loss of head per unit length of pipe

##### Most economical section of a triangular channel, is:

Options are :

• Isosceles triangle with 45� vertex angle
• Equilateral triangle
• Right angled triangle
• Right angled triangle with equal sides

Answer :Right angled triangle with equal sides

Options are :

• D
• C
• B
• A

##### Specific weight of liquid:

Options are :

• Does not vary on any other planet
• Does not remain constant at every place
• Varies from place to place on the earth
• Remains constant at every place

Answer :Does not vary on any other planet

##### Manning's formula is used for:

Options are :

• Head loss due to friction in open channels
• Head loss due to friction in pipes flowing full
• Flow in open channels
• Flow in pipes

##### Pick up the correct statement from the following:

Options are :

• When the length of the tube is three times the diameter of the internal mouth piece, the jet diameter is equal to diameter of the tube
• When the length of the tube is equal to diameter of the internal mouth piece, the jet of liquid comes out without touching the sides of the tube
• None of these

Answer :When the length of the tube is three times the diameter of the internal mouth piece, the jet diameter is equal to diameter of the tube When the length of the tube is equal to diameter of the internal mouth piece, the jet of liquid comes out without touching the sides of the tube

##### For the flow of liquid from an open ended tube (or nozzle) leading to the formation of spray of liquid drops, the number generally applied, is:

Options are :

• Reynold number
• Weber number
• Froude number
• Mach number

##### Which one of the following statements is true ?

Options are :

• The value of kinetic energy correction factor for turbulent flow lies between 1.03 to 1.06
• The practical value of kinetic energy correction factor for turbulent flow is unity
• All the above
• The value of kinetic energy correction factor for laminar flow is 2

##### Fluids change the volume under external presssure due to:

Options are :

• None of these
• Viscosity
• Plasticity
• Compressibility

##### Gauge pressure is:

Options are :

• Atmospheric pressure - absolute pressure
• None of these
• Absolute pressure + atmospheric pressure
• Absolute pressure - atmospheric pressure

Answer :Absolute pressure - atmospheric pressure

Options are :

• D
• A
• C
• B

##### In flow, the liquid particles may possess:

Options are :

• Potential energy
• Pressure energy
• All the above
• Kinetic energy

##### From a nozzle exposed to atmosphere, the liquid jet traverses:

Options are :

• An elliptical path
• A circular path
• A straight line
• A parabolic path

##### If the forces are due to inertia and gravity, and frictional resistance plays only a minor role, the design of the channels is made by comparing:

Options are :

• Froude number
• Reynold number
• Mach number
• Weber number

##### A rectangular channel 6 m wide and 3 m deep and having a bed slope as 1 in 2000 is running full. If Chezy's constant C = 54.8, pick up the correct specification of the channel from the following:

Options are :

• Velocity of flow = 1.5 m/sec
• Hydraulic mean depth = 1.5 m
• Rate of flow = 27 m^(3)/sec
• All the above

Options are :

• 6 mm
• 8 mm
• 10 mm
• 2 mm
• 4 mm

Options are :

• 20,000 kgf
• 18,000 kgf
• 14,137 kgf
• 5,863 kgf

Options are :

• 5�
• 2�
• 3�
• 4�

##### For the most economical trapezoidal open channel:

Options are :

• Half of the top width must be equal to one of the sloping sides
• The hydraulic mean depth must be equal to half the depth of flow
• All of these
• The semicircle drawn with top width as diameter must touch the three sides of the channel

##### Barometers are used to measure:

Options are :

• Pressure in water channels, pipes etc.
• Very low pressure
• Atmospheric pressure
• Difference in pressure at two points
• Very high pressure

Options are :

• 17.5 m^(3)
• 22.5 m^(3)
• 25 km^(3)
• 20.0 m^(3)

##### Kinematic viscosity of liquids by equation Larger image is determined by:

Options are :

• None of these
• Redwood viscometer
• Saybolt universal viscometer
• Engler viscometer

##### The ratio of the inertia and gravitational force acting in any flow, ignoring other forces, is called:

Options are :

• Frode number
• Euler number
• Weber number
• Reynold number

Options are :

• E
• D
• A
• C
• B

##### A steady uniform flow is through:

Options are :

• An expanding tube at increasing rate
• A long pipe at constant rate
• An expanding tube at constant rate
• A long pipe at increasing rate
• A long pipe at decreasing rate

Answer :A long pipe at constant rate

Options are :

• 3/2
• 2/5
• 5/2
• 2/3

Options are :

• Elliptical
• Parabolic
• Hyperbolic
• Circular

Options are :

• D
• B
• A
• C