Hydraulics and Fluid Mechanics

Q1: In open channels, the specific energy is the

A total energy per unit discharge

B total energy measured with respect to the datum passing through the bottom of the channel

C total energy measured above the horizontal datum

D kinetic energy plotted above the free surface of water

Q2: Coefficient of contraction is the ratio of

A actual velocity of jet at vena contracta to the theoretical velocity

B loss of head in the orifice to the head of water available at the exit of the orifice

C actual discharge through an orifice to the theoretical discharge

D area of jet at vena contracta to the area of orifice

Q3: The kinematic viscosity is the

A ratio of absolute viscosity to the density of the liquid

B ratio of density of the liquid to the absolute viscosity

C product of absolute viscosity and density of the liquid

D product of absolute viscosity and mass of the liquid

Q4: A flow in which the volume of a fluid and its density does not change during the flow is called __________ flow.

A incompressible

B compressible

Q5: An error of 1% in measuring head over the apex of the notch (H) will produce an error of __________ in discharge over a triangular notch.

A 1%

B 1.5%

C 2%

D 2.5%

Q6: In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

A less than

B more than

Q7: The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy 's coefficient of friction for pipe, and l = Length of pipe )

A

B

C

D

Q8: A structure whose width is __________ the width of the channel, is called a flumed structure.

A less than

B more than

Q9: In a free nappe,

A the pressure below the nappe is atmospheric

B the pressure below the nappe is negative

C the pressure above the nappe is atmospheric

D the pressure above the nappe is negative

Q10: The discharge through a siphon spillway is

A Cd x a2gH

B Cd x a2g x H3/2

C Cd x a2g x H2

D Cd x a2g x H5/2

Q11: The stability of a dam is checked for

A tension at the base

B overturning of the wall or dam

C sliding of the wall or dam

D all of these

Q12: The weight per unit volume of a liquid at a standard temperature and pressure is called

A specific weight

B mass density

C specific gravity

D none of these

Q13: The metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.

A The bodies A and B have equal stability

B The body A is more stable than body B

C The body B is more stable than body A

D The bodies A and B are unstable

Q14: The total energy line lies over the hydraulic gradient line by an amount equal to the

A pressure head

B velocity head

C pressure head + velocity head

D pressure head - velocity head

Q15: The coefficient of viscosity may be determined by

A capillary tube method

B orifice type viscometer

C rotating cylinder method

D all of these

Q16: The centre of gravity of the volume of the liquid displaced is called

A centre of pressure

B centre of buoyancy

C metacentre

D none of these

Q17: The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)

A
Cd x b2gH

B
Cd x b2g x H

C
Cd x b2g x H3/2

D Cd x b2g x H2

Q18: The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)

A 1/RN

B 4/RN

C 16/RN

D 64/RN

Q19: A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)

A wH

B wH/2

C wH2/2

D wH2/3

Q20: Euler's equation in the differential form for the motion of liquids is given by

A

B

C ρ.dp + g.dz + v.dv = 0

D ρ.dp - g.dz + v.dv = 0

Q21: According to equation of continuity,

A w1a1 = w2a2

B w1v1 = w2v2

C a1v1 = a2v2

D a1/v1 = a2/v2

Q22: The loss of head due to an obstruction in a pipe is twice the loss of head at its entrance.

A Agree

B Disagree

Q23: The centre of buoyancy is the centre of area of the immersed body.

A Correct

B Incorrect

Q24: Which of the following is an example of laminar flow?

A Under ground flow

B Flow past tiny bodies

C Flow of oil in measuring instruments

D all of these

Q25: Coefficient of resistance is the ratio of

A actual velocity of jet at vena contracta to the theoretical velocity

B area of jet at vena contracta to the area of orifice

C loss of head in the orifice to the head of water available at the exit of the orifice

D actual discharge through an orifice to the dieoretical discharge

Q26: The coefficient of discharge for an external mouthpiece is

A 0.375

B 0.5

C 0.707

D 0.855

Q27: A siphon is used to connect two reservoirs at different levels intervened by a high ridge.

A True

B False

Q28: An ideal fluid is frictionless and incompressible.

A Correct

B Incorrect

Q29: In order to measure the flow with a venturimeter, it is installed in

A horizontal line

B inclined line with flow upwards

C inclined line with flow downwards

D any direction and in any location

Q30: The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)

A Q = Cd x b2g(H2 - H1)

B
Q = Cd x b2g(H21/2 - H11/2)

C
Q = Cd x b2g(H23/2 - H13/2)

D
Q = Cd x b2g(H22 - H12)

Q31: The maximum discharge over a broad crested weir is

A 0.384 Cd x L x H1/2

B 0.384 Cd x L x H3/2

C 1.71 Cd x L x H1/2

D 1.71 Cd x L x H3/2

Q32: The pressure less than atmospheric pressure is known as

A suction pressure

B vacuum pressure

C negative gauge pressure

D all of these

Q33: The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)

A Cd 2g x H

B Cd 2g x H3/2

C
Cd 2g x H2

D
Cd 2g x H5/2

Q34: A manometer is used to measure

A low pressure

B moderate pressure

C high pressure

D atomospheric pressure

Q35: The value of bulk modulus of a fluid is required to determine

A Reynold's number

B Froude's number

C Mach number

D Euler's number

Q36: The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)

A w x Q x H

B w x Q x hf

C w x Q (H - hf)

D w x Q (H + hf)

Q37: In one dimensional flow, the flow

A is steady and uniform

B takes place in straight line

C takes place in curve

D takes place in one direction

Q38: The Bernoulli's equation is based on the assumption that

A there is no loss of energy of the liquid flowing

B the velocity of flow is uniform across any cross-section of the pipe

C no force except gravity acts on the fluid

D all of the above

Q39: One litre of water occupies a volume of

A 100 cm3

B 250 cm3

C 500 cm3

D 1000 cm3

Q40: In a venturimeter, the velocity of liquid at throat is __________ than at inlet.

A higher

B lower

Q41: The Reynold's number of a ship is __________ to its velocity and length.

A directly proportional

B inversely proportional

Q42: A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be

A

B

C

D

Q43: The maximum efficiency of transmission through a pipe is

A 50%

B 56.7%

C 66.67%

D 76.66%

Q44: The pressure measured with the help of a piezometer tube is in

A N/mm2

B N/m2

C head of liquid

D all of these

Q45: In a depressed nappe

A the pressure below the nappe is atmospheric

B the pressure below the nappe is negative

C the pressure above the nappe is atmospheric

D the pressure above the nappe is negative

Q46: When a tube of smaller diameter is dipped in water, the water rises in the tube due to viscosity of water.

A True

B False

Q47: The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is

A

B

C

D

Q48: The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.

A equal to

B less than

C more than

Q49: If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in

A neutral equilibrium

B stable equilibrium

C unstable equilibrium

D none of these

Q50: A weir is said to be broad crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

A equal to.

B less than

C more than


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