The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by(A) Cv. √(2gH)(B) Cc. √(2gH)(C) Cd. √(2gH)(D) Cv. Va

The actual velocity at vena-contracta for flow through an orifice from a
reservoir is given by
(A) Cv
. √(2gH)
(B) Cc
. √(2gH)
(C) Cd
. √(2gH)
(D) Cv
. Va
by

1 Answer

Answer :

(A) Cv
. √(2gH)
by

Related questions

Cd , Cc and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficient, Cc = co-efficient of contraction = (area of jet at vena￾contracta/area of opening), Cv = co-efficient of velocity = (actual velocity at vena-contracta/theoretical velocity). (A) Cd = Cc /Cv (B) Cd = Cc .Cv (C) Cd = Cv / Cc (D) None of these

Description : Cd , Cc and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficient, Cc = co-efficient of contraction = (area of jet at vena￾contracta/area of opening), Cv = co-efficient of velocity = (actual velocity ... A) Cd = Cc /Cv (B) Cd = Cc .Cv (C) Cd = Cv / Cc (D) None of these

Last Answer : (B) Cd = Cc .Cv

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 theoretical discharge

Description : 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 ... available at the exit of the orifice (D) Actual discharge through an orifice to the theoretical discharge

Last Answer : Answer: Option C

Coefficient of velocity is defined as 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) Actual discharge through an orifice to the theoretical discharge (D) None of the above

Description : Coefficient of velocity is defined as 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) Actual discharge through an orifice to the theoretical discharge (D) None of the above

Last Answer : Answer: Option A

Co-efficient of discharge (Cd ) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv ; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about (A) 0.42 (B) 0.62 (C) 0.82 (D) 0.98

Description : Co-efficient of discharge (Cd ) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv ; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about (A) 0.42 (B) 0.62 (C) 0.82 (D) 0.98

Last Answer : (B) 0.62

Co-efficient of discharge (Cd ) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv ; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about (A) 0.42 (B) 0.62 (C) 0.82 (D) 0.98

Description : Co-efficient of discharge (Cd ) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv ; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about (A) 0.42 (B) 0.62 (C) 0.82 (D) 0.98

Last Answer : (B) 0.62

Vena-contracta formed during flow of a liquid through an orificemeter has (A) Minimum liquid cross-section (B) More diameter compared to orifice diameter (C) Minimum velocity of fluid stream (D) None of these

Description : Vena-contracta formed during flow of a liquid through an orificemeter has (A) Minimum liquid cross-section (B) More diameter compared to orifice diameter (C) Minimum velocity of fluid stream (D) None of these

Last Answer : (A) Minimum liquid cross-section

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) Loss of head in the orifice to the head of water available at the exit of the orifice (D) Area of jet at vena-contracta to the area of orifice

Description : 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 ... available at the exit of the orifice (D) Area of jet at vena-contracta to the area of orifice

Last Answer : Answer: Option D

The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta) (A) 2gH (B) H × g) (C) 2g × H (D) 2gh)

Description : The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta) (A) 2gH (B) H × g) (C) 2g × H (D) 2gh)

Last Answer : Answer: Option D

Location of vena-contracta in an orificemeter does not depend upon the (A) Type of orifice (B) Density, viscosity & compressibility of the fluid (C) Ratio of pipe diameter to orifice diameter (D) Pipe roughness

Description : Location of vena-contracta in an orificemeter does not depend upon the (A) Type of orifice (B) Density, viscosity & compressibility of the fluid (C) Ratio of pipe diameter to orifice diameter (D) Pipe roughness

Last Answer : (A) Type of orifice

What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta? (A) 0.64 (B) 1.65 (C) 0.32 (D) 0.94

Description : What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta? (A) 0.64 (B) 1.65 (C) 0.32 (D) 0.94

Last Answer : (A) 0.64

In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice. (A) Equal to (B) One-fourth (C) One-third (D) One-half

Description : In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice. (A) Equal to (B) One-fourth (C) One-third (D) One-half

Last Answer : Answer: Option B

A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is (A) 0.46 (B) 0.64 (C) 0.78 (D) 0.87

Description : A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is (A) 0.46 (B) 0.64 (C) 0.78 (D) 0.87

Last Answer : Answer: Option B

Torricelli's theorem states that the velocity ‘v’ of the liquid emerging from the bottom of the wide tank is given by √(2gh). In practice, this velocity is: A. equal to √(2gh) B. greater than √(2gh) C. lesser than √(2ghD. independent of height and gravitational field strength)

Description : Torricelli's theorem states that the velocity ‘v’ of the liquid emerging from the bottom of the wide tank is given by √(2gh). In practice, this velocity is: A. equal to √(2gh) B. greater than √(2gh) C. lesser than √(2gh) D. independent of height and gravitational field strength

Last Answer :  lesser than √(2gh

Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance) (A) Cc × Cv (B) Cc × Cr (C) Cv × Cr (D) Cc /Cr

Description : Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance) (A) Cc × Cv (B) Cc × Cr (C) Cv × Cr (D) Cc /Cr

Last Answer : Answer: Option A

Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter 'd' (A) d (B) 0.5 d (C) 2d (D) 4d

Description : Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter 'd' (A) d (B) 0.5 d (C) 2d (D) 4d

Last Answer : (B) 0.5 d

01. In a convergent mouthpiece, the absolute pressure head at vena contracta is the same as that of the atmosphere. A) True B) False

Description : 01. In a convergent mouthpiece, the absolute pressure head at vena contracta is the same as that of the atmosphere. A) True B) False

Last Answer : A

10. In an external or internal mouthpiece, the absolute pressure head at vena contracta is zero when atmospheric pressure head is 10.3 m of water. A) Correct B) Incorrect

Description : 10. In an external or internal mouthpiece, the absolute pressure head at vena contracta is zero when atmospheric pressure head is 10.3 m of water. A) Correct B) Incorrect

Last Answer : A

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 (C) Equal to (D) None of these

Description : 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 (C) Equal to (D) None of these

Last Answer : Answer: Option A

In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta. (A) Less than (B) More than (C) Equal to (D) None of these

Description : In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta. (A) Less than (B) More than (C) Equal to (D) None of these

Last Answer : Answer: Option A

A point, in a compressible flow where the velocity of fluid is zero, is called (A) Critical point (B) Vena contractaC) Stagnation point (D) None of these

Description : A point, in a compressible flow where the velocity of fluid is zero, is called (A) Critical point (B) Vena contracta C) Stagnation point (D) None of these

Last Answer : Answer: Option C

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 = (2/3) Cd × b × (2g) × (H2 - H1) (B) Q = (2/3) Cd × b × (2g) × (H2 1/2 - H1 1/2) (C) Q = (2/3) Cd × b × (2g) × (H2 3/2 - H1 3/2) (D) Q = (2/3) Cd × b × (2g) × (H2 2 - H1 2 )

Description : 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 ... H1 3/2) (D) Q = (2/3) Cd b (2g) (H2 2 - H1 2 )

Last Answer : Answer: Option C

For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively). (A) Increase (B) Decrease (C) Remain constant (D) Either (A) or (B); depends on other factors

Description : For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively). (A) Increase (B) Decrease (C) Remain constant (D) Either (A) or (B); depends on other factors

Last Answer : (A) Increase

20. The coefficient of discharge is the ratio of theoretical discharge to the actual discharge through an orifice. A) True B) False

Description : 20. The coefficient of discharge is the ratio of theoretical discharge to the actual discharge through an orifice. A) True B) False

Last Answer : B

Air output of a duster is given by formula a) Q= 60×A×V b)Q= 60×A×(2GH/Y) c) Q= 240×A×h d) all of the above

Description : Air output of a duster is given by formula a) Q= 60×A×V b)Q= 60×A×(2GH/Y) c) Q= 240×A×h d) all of the above

Last Answer : d) all of the above

An orifice is said to be large, if (A) The size of orifice is large (B) The velocity of flow is large (C) The available head of liquid is more than 5 times the height of orifice (D) The available head of liquid is less than 5 times the height of orifice

Description : An orifice is said to be large, if (A) The size of orifice is large (B) The velocity of flow is large (C) The available head of liquid is more than 5 times the height of orifice (D) The available head of liquid is less than 5 times the height of orifice

Last Answer : Answer: Option D

Cd for the orifice plate varies from (A) 0.58 to 0.8 (B) 0.93 to 0.98 (C) 0.2 to 0.3 (D) 0.02 to 0.03

Description : Cd for the orifice plate varies from (A) 0.58 to 0.8 (B) 0.93 to 0.98 (C) 0.2 to 0.3 (D) 0.02 to 0.03

Last Answer : (A) 0.58 to 0.8

A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to (A) √(Particle diameter) (B) Particle diameter (C) (Particle diameter)2 (D) (Particle diameter)3

Description : A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to (A) √(Particle diameter) (B) Particle diameter (C) (Particle diameter)2 (D) (Particle diameter)3

Last Answer : B) Particle diameter

14. The velocity of liquid flowing through an orifice varies with the available head of the liquid. A) Agree B) Disagree

Description : 14. The velocity of liquid flowing through an orifice varies with the available head of the liquid. A) Agree B) Disagree

Last Answer : A

Which of the following represents the estimated value of the work actually accomplished? A. Earned value (EV) B. Planned value (PV) C. Actual cost (AC D. Cost variance (CV)

Description : Which of the following represents the estimated value of the work actually  accomplished?  A. Earned value (EV)  B. Planned value (PV)  C. Actual cost (AC  D. Cost variance (CV)

Last Answer : A. Earned value (EV)

Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2 /sec.D1 = diffusion co-efficient; cm2 /sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3 /sec. V = volume, cm3 .) (A) Reactor dispersion number (D/vL) (B) Reduced time (vt/V) (C) Thiele modulus L √(k/D1 ) (D) None of these

Description : Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2 /sec.D1 = diffusion co-efficient; cm2 /sec L = length of the reactor, cm t = time, sec, v = volumetric ... (D/vL) (B) Reduced time (vt/V) (C) Thiele modulus L √(k/D1 ) (D) None of these

Last Answer : (D) None of these

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 bring the liquid level from H1 to H2 will be (A) 2A × d × a × 2g) (B) 2A × d × a × 2g) (C) 2A × - d × a × 2g) (D) 2A × 3/2 - 3/2)/Cd × a × 2g)

Description : 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 bring the liquid level from H1 to H2 will be (A) 2A d a 2g) (B) 2A d ... 2g) (C) 2A - d a 2g) (D) 2A 3/2 - 3/2)/Cd a 2g)

Last Answer : Answer: Option C

Cd is always __________ Cc (A) Greater than (B) Less than (C) Equal to (D) Either more or less than

Description : Cd is always __________ Cc (A) Greater than (B) Less than (C) Equal to (D) Either more or less than

Last Answer : (A) Greater than

A person of mass ‘m’ kg jumps from a height of ‘h’ meters, he will land on the ground with a velocity equal to: A. √(2 × g × hB. 1/h × √(2 × g)C. 2ghD. 2√(g × h))

Description : A person of mass ‘m’ kg jumps from a height of ‘h’ meters, he will land on the ground with a velocity equal to: A. √(2 × g × h) B. 1/h × √(2 × g) C. 2gh D. 2√(g × h)

Last Answer : √(2 × g × h)

Velocity of escape is equal to A. r × √(2g); where r: radius of Earth or any other planet for that matter, g: gravitational field strength B. g × √(2r); where r: radius of Earth or any other planet for that matter, g: gravitational field strength C. √(2g) ⁄ r; where r: radius of Earth or any other planet for that matter, g: gravitational field strength D. √(2gr); where r: radius of Earth or any other planet for that matter, g: gravitational field strength

Description : Velocity of escape is equal to A. r √(2g); where r: radius of Earth or any other planet for that matter, g: gravitational field strength B. g √(2r); where r: radius of ... (2gr); where r: radius of Earth or any other planet for that matter, g: gravitational field strength

Last Answer : √(2gr); where r: radius of Earth or any other planet for that matter, g: gravitational field strength

The expression for velocity of a wave in the conductor is a) V = √(2ω/μσ) b) V = √(2ωμσ) c) V = (2ω/μσ) d) V = (2ωμσ)

Description : The expression for velocity of a wave in the conductor is a) V = √(2ω/μσ) b) V = √(2ωμσ) c) V = (2ω/μσ) d) V = (2ωμσ)

Last Answer : a) V = √(2ω/μσ)

An electron and a neutron enter a magnetic field with the same velocity. Ratio of electron to neutron’s acceleration is a) mn me b) √ mn me c) √ me mn d) me

Description : An electron and a neutron enter a magnetic field with the same velocity. Ratio of electron to neutron’s acceleration is a) mn me b) √ mn me c) √ me mn d) me

Last Answer : a) mn me

Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas) (A) √T (B) 1/√P (C) √y (D) 1/√ρ

Description : Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas) (A) √T (B) 1/√P (C) √y (D) 1/√ρ

Last Answer : (B) 1/√P

A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is(A) 26(B) 42(C) 269(D) 325

Description : A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is (A) 26 (B) 42 (C) 269 (D) 325

Last Answer : (C) 269

Speed ‘v’ with which wave travels through a medium is given by A. modulus of elasticity/density of the medium B. modulus of elasticity/√(density of the medium) C. √(modulus of elasticity/density of the medium) D. v=d/t

Description : Speed ‘v’ with which wave travels through a medium is given by A. modulus of elasticity/density of the medium B. modulus of elasticity/√(density of the medium) C. √(modulus of elasticity/density of the medium) D. v=d/t

Last Answer : √(modulus of elasticity/density of the medium)

The ratio of the actual damping coefficient (c) to the critical damping coefficient (cc ) is known as _________ A Damping factor B Damping coefficient C Resistive factor D Resistive coefficient

Description : The ratio of the actual damping coefficient (c) to the critical damping coefficient (cc ) is known as _________ A Damping factor B Damping coefficient C Resistive factor D Resistive coefficient

Last Answer : A Damping factor

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Description : The ratio of the actual damping coefficient (c) to the critical damping coefficient (cc ) is known as _________ ( A ) Damping factor ( B ) Damping coefficient ( C ) Resistive factor ( D ) Resistive coefficient

Last Answer : ( A ) Damping factor

The ratio of the actual damping coefficient (c) to the critical damping coefficient (cc ) is known as _________ a) Damping factor b) Damping coefficient c) Resistive factor d) Resistive coefficient

Description : The ratio of the actual damping coefficient (c) to the critical damping coefficient (cc ) is known as _________ a) Damping factor b) Damping coefficient c) Resistive factor d) Resistive coefficient

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Pick out the wrong statement. (A) Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient (B) In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles (C) S.I. unit of fouling factor is Watt/m2 .°K (D) Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube

Description : Pick out the wrong statement. (A) Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient (B) In a shell and tube heat exchanger ... surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube

Last Answer : (C) S.I. unit of fouling factor is Watt/m2 .°K

Open channel liquid flow is most conveniently measured by a (A) Hot wire anemometer (B) Notch (C) Rotameter (D) Segmental orifice

Description : Open channel liquid flow is most conveniently measured by a (A) Hot wire anemometer (B) Notch (C) Rotameter (D) Segmental orifice

Last Answer : (B) Notch

Which of the following may be termed as a variable orifice flow-meter? (A) Rotameter (B) Pitot tube (C) V-notch (D) All (A), (B) and (C)

Description : Which of the following may be termed as a variable orifice flow-meter? (A) Rotameter (B) Pitot tube (C) V-notch (D) All (A), (B) and (C)

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For spheres, the specific surface shape factor is given by (A) AD/V (B) D/V (C) A/V (D) √(AD/V)

Description : For spheres, the specific surface shape factor is given by (A) AD/V (B) D/V (C) A/V (D) √(AD/V)

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Critical Speed (Nc ) of a ball mill is given by (where R1 and R2 are radii of ball mill and the ball respectively). (A) Nc = (1/4π). √(g/R1 - R2 ) (B) Nc = (1/2π). √(g/R1 - R2 ) (C) Nc = (1/π). √(g/R1 - R2 ) (D) Nc = (1/2π). √(R1 - R2 /g)

Description : Critical Speed (Nc ) of a ball mill is given by (where R1 and R2 are radii of ball mill and the ball respectively). (A) Nc = (1/4π). √(g/R1 - R2 ) (B) Nc = (1/2π). √(g/R1 - R2 ) (C) Nc = (1/π). √(g/R1 - R2 ) (D) Nc = (1/2π). √(R1 - R2 /g)

Last Answer : (B) Nc = (1/2π). √(g/R1 - R2 )

The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct). (A) x (B) √(πx) (C) √(2x) (D) √(x/2)

Description : The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct). (A) x (B) √(πx) (C) √(2x) (D) √(x/2)

Last Answer : (A) x