MCQOPTIONS
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MCQOPTIONS
This section includes 32 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When the end contractions of the weir are suppressed, then number of end contractions () are taken as zero |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 2. |
An error of 1% in measuring head over the crest of the notch () will produce an error of __________ in discharge over a triangular notch, |
| A. | 1% |
| B. | 1.5% |
| C. | 2% |
| D. | 2.5% |
| Answer» E. | |
| 3. |
The hydraulic mean depth for a circular pipe of diameter () is |
| A. | /6 |
| B. | /4 |
| C. | /2 |
| Answer» C. /2 | |
| 4. |
The celerity (velocity) of a pressure wave in a fluid is given by (where = Bulk modulus, and ρ = Density of the fluid) |
| A. | .ρ |
| Answer» C. | |
| 5. |
The pressure intensity in kN/m (or kPa) at any point in a liquid is (where = Specific weight of liquid, and = Depth of liquid from the surface) |
| A. | / |
| B. | / |
| Answer» C. | |
| 6. |
The mass of 2.5 m of a certain liquid is 2 tonnes. Its mass density is |
| A. | 200 kg/m |
| B. | 400 kg/m |
| C. | 600 kg/m |
| D. | 800 kg/m |
| Answer» E. | |
| 7. |
The increase in pressure at the outer edge of a drum of radius () completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is |
| A. | ρ ω |
| B. | |
| C. | 2ρ ω |
| D. | |
| Answer» D. | |
| 8. |
The total pressure on a horizontally immersed surface is (where = Specific weight of the liquid, = Area of the immersed surface, and = Depth of the centre of gravity of the immersed surface from the liquid surface) |
| A. | . |
| B. | / |
| Answer» D. | |
| 9. |
The length of the divergent cone in a venturimeter is __________ that of the convergent cone. |
| A. | equal to |
| B. | double |
| C. | three to four times |
| D. | five to six times |
| Answer» D. five to six times | |
| 10. |
The discharge through an external mouthpiece is given by (where = Cross-sectional area of the mouthpiece, and = Height of liquid above the mouthpiece) |
| A. | 0.855 |
| B. | 1.855 |
| C. | 1.585 |
| D. | 5.85 |
| Answer» B. 1.855 | |
| 11. |
The shear stress-strain graph for a newtonian fluid is a |
| A. | straight line |
| B. | parabolic curve |
| C. | hyperbolic curve |
| D. | elliptical |
| Answer» B. parabolic curve | |
| 12. |
The discharge through a small rectangular orifice is given by (where = Coefficient of discharge for the orifice, = Cross-sectional area of the orifice, = Height of the liquid above the centre of the orifice) |
| A. | = |
| B. | x |
| C. | x |
| Answer» B. x | |
| 13. |
A piezometer tube is used only for measuring |
| A. | low pressure |
| B. | high pressure |
| C. | moderate pressure |
| D. | vacuum pressure |
| Answer» D. vacuum pressure | |
| 14. |
If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, The body is said to be in __________ equilibrium. |
| A. | neutral |
| B. | stable |
| C. | unstable |
| Answer» B. stable | |
| 15. |
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where = Area of mouthpiece, and = Height of liquid above the mouthpiece) |
| A. | 0.5 |
| B. | 0.707 |
| C. | 0.855 |
| Answer» B. 0.707 | |
| 16. |
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 = Specific weight of liquid, and = Height of liquid) |
| A. | /2 |
| B. | /2 |
| C. | /3 |
| Answer» D. | |
| 17. |
An error of 1% in measuring head over the apex of the notch () will produce an error of __________ in discharge over a triangular notch. |
| A. | 1% |
| B. | 1.5% |
| C. | 2% |
| D. | 2.5% |
| Answer» E. | |
| 18. |
The water pressure per metre length on a vertical masonry wall of dam is (where = Specific weight of the liquid, and = Height of the liquid) |
| A. | /2 |
| B. | /2 |
| C. | /4 |
| Answer» D. | |
| 19. |
According to Chezy's formula, the discharge through an open channel is (where = Area of flow, = Chezy's constant, = Hydraulic mean depth, and = Uniform slope in bed) |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 20. |
The density of a liquid in kg/m is numerically equal to its specific gravity. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
A vessel of 4 m contains an oil which weighs 30 kN. The specific weight of the oil is |
| A. | 4.5 kN/m |
| B. | 6 kN/m |
| C. | 7.5 kN/m |
| D. | 10 kN/m |
| Answer» D. 10 kN/m | |
| 22. |
Coefficient of discharge Cd is equal to (where = Coefficient of contraction, = Coefficient of velocity, and = Coefficient of resistance) |
| A. | x |
| B. | x |
| C. | x |
| D. | / |
| Answer» B. x | |
| 23. |
The specific gravity of an oil whose specific weight is 7.85 kN/m, is |
| A. | 0.8 |
| B. | 1 |
| C. | 1.2 |
| D. | 1.6 |
| Answer» B. 1 | |
| 24. |
The divergent portion of a venturimeter is made longer than convergent portion in order to |
| A. | avoid the tendency of breaking away the stream of liquid |
| B. | to minimise frictional losses |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 25. |
The pressure of liquid at throat in a venturimeter is __________ than that at inlet. |
| A. | higher |
| B. | lower |
| Answer» C. | |
| 26. |
The quantity of a liquid flowing per second through a section of a pipe or a channel is called discharge and is measured in cumecs (m/s). |
| A. | True |
| B. | False |
| Answer» B. False | |
| 27. |
In a lockgate, the reaction between two gates is (where = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock) |
| A. | P / 2sinα |
| Answer» D. | |
| 28. |
The velocity of the liquid flowing through the divergent portion of a venturimeter |
| A. | remains constant |
| B. | increases |
| C. | decreases |
| D. | depends upon mass of liquid |
| Answer» D. depends upon mass of liquid | |
| 29. |
The theoretical velocity of jet at vena contracta is (where = Head of water at vena contracta) |
| A. | 2 |
| B. | 2 |
| Answer» E. | |
| 30. |
When the venturimeter is inclined, then for a given flow it will show __________ reading. |
| A. | same |
| B. | more |
| C. | less |
| Answer» B. more | |
| 31. |
A hemispherical tank of radius () containing liquid upto height () has an orifice of cross-sectional area () at its bottom. The time required to lower the level of liquid from () to () will be |
| A. | none of the above |
| Answer» D. | |
| 32. |
The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where = Reynold number) |
| A. | 1/ |
| B. | 4/ |
| C. | 16/ |
| D. | 64/ |
| Answer» D. 64/ | |