   ## Hydraulics MCQ Practice Questions (Civil Engineering) Set 5

Options are :

• C
• D
• A
• B

##### If v1 and v2 are the velocities of flow before and after sudden enlargement in a pipe, the head loss given by Carnot and Borda equation, is:

Options are :

• (v2^(2) - v1^(2))/2g
• (v1 + v2)^(2)/2g
• (v2 - v1)^(2)/2g
• (v1 - v2)^(2)/2g

##### An open container filled with water is moved vertically downward with a uniform linear acceleration. The pressure at its bottom will be:

Options are :

• None of these
• Greater than static pressure
• Equal to static pressure
• Lesser than static pressure

Options are :

• 2.0 m
• 1.5 m
• 2.5 m
• 1.0 m

##### The pressure less than atmospheric pressure is known as:

Options are :

• Suction pressure
• All the above
• Vacuum pressure
• Negative gauge pressure

##### The flow in open channel is said to be critical if the Froude number is:

Options are :

• Greater than 1.0
• Less than 1.0
• None of these
• Equal to 1.0

##### The dimensions MLT^(-2) refers to:

Options are :

• None of these
• Specific weight
• Discharge
• Force

##### An ideal fluid:

Options are :

• Obeys Newton's law of velocity
• Is frictionless and incompressible
• Is very viscous
• Is similar to gas

##### Practical fluids possess:

Options are :

• All the above
• Viscosity
• Surface tension
• Compressibility

##### The differential equation dp/? + gdz + vdv = 0 for a fluid motion is suggested by:

Options are :

• Laplace
• Leonard Euler
• Bernoulli
• Cauchy-Riemann

##### The formula Q = m x L x ?2g x H^(3/2) where Larger image was suggested by:

Options are :

• None of these
• Bazin
• Francis
• Cipolletti

Options are :

• 2.50 m
• 2.51 m
• 2.48 m
• 2.49 m

##### For a most economical trapezoidal open channel, the half of the top width must be equal to:

Options are :

• The depth of flow
• None of these
• One sloping side
• The bed width

##### The imaginary line drawn such that the tangents at its all points indicate the direction of the velocity of the fluid particles at each point, is called:

Options are :

• Stream line
• Path line
• Streak line
• Potential line

##### In C.G.S. system the units of kinematic viscosity, is:

Options are :

• Poise
• None of these
• Newton
• Stoke

##### Chezy's formula is used to determine:

Options are :

• Velocity of flow in pipe
• Velocity of flow in open channels
• None of these
• Head loss due to friction in pipe

Answer :Velocity of flow in open channels

##### A rise or fall of liquid in a glass tube of a very small diameter when dipped is:

Options are :

• Directly proportional to the specific weight of liquid
• Directly proportional to the force per unit length of periphery
• Inversely proportional to the diameter of the glass tube
• Direcly proportional to the sine of the angle of contact

Answer :Directly proportional to the specific weight of liquid

##### When the whole fluid mass rotates either due to fluid pressure or gravity or rotation previously imparted, the motion is known as:

Options are :

• Free vortex
• Forced vortex
• Non-potential vortex
• Rotational vortex

##### An orifice is an opening in a vessel with:

Options are :

• Partially full flow
• The water level of the liquid on the up stream side is below the top of the orifice
• Closed perimeter of regular shape through which water flows
• Prolonged sides having length of 2 to 3 diameters of the opening in thick wall

Answer :Closed perimeter of regular shape through which water flows

Options are :

• B
• A
• C
• D

##### In case of laminar flow through a circular pipe:

Options are :

• None of these
• Energy correction factor is 2.00
• Momentum correction factor is 1.33

Answer :Energy correction factor is 2.00 Momentum correction factor is 1.33

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

Options are :

• Vertical distance between the total energy line and hydraulic grade line is equal to the velocity head
• Total energy gradient is the graphical representation of the total head at any section of a pipe line
• Vertical distance between the total energy line and total energy gradient represents loss of head
• All the above

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

Options are :

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

Answer :An expanding tube at constant rate

##### Uniform flow is said to occur when:

Options are :

• Frictional loss in the particular length of the channel, will be less than the drop in elevation
• Size and shape of the cross-section in a particular length remain constant
• Frictional loss in the particular length of the channel will the more than the drop in its elevation
• Size and shape of the cross-section change along a length

Answer :Size and shape of the cross-section in a particular length remain constant

##### Cappoletti weir is a:

Options are :

• Trapezoidal weir, whose sides slope 1 horizontal to 2 verticals
• Rectangular weir whose length is kept 3 times the height of the water above sill
• A combination of rectangular and triangular weirs
• Triangular weir whose notch angle is 90�

Answer :Trapezoidal weir, whose sides slope 1 horizontal to 2 verticals

Options are :

• 2.0%
• 1.25%
• 2.5%
• 1.5%

Options are :

• 4
• 1
• 2
• 3

Options are :

• 41 cm
• 60 cm
• 76 cm
• 56 cm
• 40 cm

##### The rise of the liquid along the walls of a revolving cylinder above the initial level, is:

Options are :

• Greater than the depression of the liquid at the axis of rotation
• None of these
• The same as the depression of the liquid at the axis of rotation
• Lesser than the depression of the liquid at the axis of rotation

Answer :The same as the depression of the liquid at the axis of rotation

##### Atmospheric pressure varies with:

Options are :

• Temperature
• All of the above
• Weather conditions
• Altitude