MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The ratio of inertia force to pressure forces is related with a non-dimensional number known as |
| A. | Nusselt number |
| B. | Mach number |
| C. | Weber number |
| D. | Reyonolds number |
| E. | Euler number |
| Answer» E. Euler number | |
| 2. |
What pressure, in Mpa, must be maintained in a diving bell, at a depth of 1200 m, to keep out the ocean water (S = 1.03) |
| A. | 12.1 |
| B. | 1.24 |
| C. | 5.16 |
| D. | 14.3 |
| E. | 9.32 |
| Answer» B. 1.24 | |
| 3. |
The depth of oil having specific gravity 0.6 to produce a pressure of 3.6 kg/cm2 will be |
| A. | 36 m of oil |
| B. | 50 m of oil |
| C. | 60 m of oil |
| D. | 40 m of oil |
| E. | 120 m of oil |
| Answer» D. 40 m of oil | |
| 4. |
As the pump speed increases, its NPSH (net positive section head) requirement |
| A. | Decreases |
| B. | Remains unaffected |
| C. | Increases |
| D. | May increase or decrease |
| E. | None |
| Answer» D. May increase or decrease | |
| 5. |
The shear stress in a turbulent pipe flow |
| A. | Varis parabolically with radius |
| B. | Varis according to the 1/7 the power law |
| C. | 60 |
| D. | is zero at the centre and increases as linearly to the wall |
| E. | is zero at the wall and increase linearly to the centre |
| Answer» F. | |
| 6. |
The radial component of velocity in a free vortex is |
| A. | inversely proportional to the square of the radial distance |
| B. | zero |
| C. | directly proportional to the radial distance |
| D. | inversely proportional to the radial distance |
| Answer» C. directly proportional to the radial distance | |
| 7. |
A right circular cylinder open at the top is filled with liquid (specific gravity 1.2) and rotated about its vertical axis at such speed that half the liquid spills out. The pressure at centre of the bottom is |
| A. | One eighth of its value when cylinder was full |
| B. | Same as before rotation |
| C. | One fourth of its value when cylinder was full |
| D. | Zero |
| E. | Half of its value when cylinder was full |
| Answer» E. Half of its value when cylinder was full | |
| 8. |
The length of mercury column at a place at an altitude will vary with respect to that at ground in a |
| A. | Parabolic relation |
| B. | First slowly and then steeply |
| C. | Hyperbolic relation |
| D. | Will remain constant |
| E. | Linear relation |
| Answer» C. Hyperbolic relation | |
| 9. |
A fluid in which resistance to deformation is independent of the shear stress is known as |
| A. | Bingham plastic fluid |
| B. | Pseudo plastic fluid |
| C. | Dilatant fluid |
| D. | Newtonian fluid |
| E. | None of the above |
| Answer» E. None of the above | |
| 10. |
Newton's law of viscosity states that shear stress is directly proportional to |
| A. | Velocity gradient |
| B. | viscosity |
| C. | Shear strain |
| D. | Greater than ten |
| E. | Velocity |
| Answer» B. viscosity | |
| 11. |
Which of the following will resist shear and its rate of deformation will be zero regardless of loading? |
| A. | 51.3 |
| B. | Ideal fluid |
| C. | Newtonian fluid |
| D. | Elastic solid |
| E. | Ideal plastic |
| Answer» E. Ideal plastic | |
| 12. |
When the shear stress acting on a fluid is removed |
| A. | the body regains its original shape and position immediately |
| B. | the body regains its original shape and position slowly |
| C. | the body regains its original shape but remains in the new position |
| D. | the body retains its new shape and position |
| Answer» E. | |
| 13. |
In a flow between two stationary parallel plates the shear stress is zero at |
| A. | the top |
| B. | at the centre where velocity is maximum |
| C. | both at the base and at the top |
| D. | the base |
| Answer» C. both at the base and at the top | |
| 14. |
The shear stress velocity gradient relation of the Newtonian fluids is |
| A. | There is no such relation |
| B. | Hyperbolic |
| C. | Linear |
| D. | Involutic |
| E. | Parabolic |
| Answer» D. Involutic | |
| 15. |
In laminar flow the pressure drop per unit length of pipe (∆p/L) is given as |
| A. | 32𝜇͞u/D2 |
| B. | 2𝜇͞u/D2 |
| C. | 32𝜇͞u/D3 |
| D. | None of above. |
| Answer» B. 2𝜇͞u/D2 | |
| 16. |
If the absolute pressure at a point in a hydraulic system is less than atmospheric pressure, the point is said to possess |
| A. | Gross positive head |
| B. | Absolute positive head |
| C. | Negative head |
| D. | Manometric head |
| E. | Positive head |
| Answer» D. Manometric head | |
| 17. |
Four piezometer openings in the same cross-section of a cast iron pipe indicate the following pressure for simultaneous reading: 43, 42.6, 42.4 37 mm Hg. What value should be taken for the pressure? |
| A. | 41.5 |
| B. | 43 |
| C. | 37 |
| D. | 42.67 |
| E. | None of the above |
| Answer» E. None of the above | |
| 18. |
The normal stress is the same in all directions at a point in fluid |
| A. | Only when the fluid has zero viscosity and is at rest |
| B. | When there is no motion of one fluid layer relative to an adjacent layer |
| C. | Regardless of the motion of one fluid layer relative to an adjacent layer |
| D. | Only when the fluid is frictionless |
| E. | Only when fluid is frictionless and incompressible |
| Answer» C. Regardless of the motion of one fluid layer relative to an adjacent layer | |
| 19. |
At point A in a pipe line carrying water the diameter is 1 m, the pressure 98 kPa and the velocity 1 m/s. At point B, 2 m higher than A, the diameter is 0.5 m and the pressure 20 kPa. The direction of flow would be |
| A. | A to B |
| B. | B to A |
| C. | Cannot be ascertained from data |
| D. | None of the above |
| Answer» B. B to A | |
| 20. |
When a liquid rotates at a angular velocity above a vertical axis as a rigid body, the pressure intensity varies |
| A. | inversely with radial distance |
| B. | directly with radial distance |
| C. | More than 20? |
| D. | Directly with square of the radial distance |
| E. | inversely with the square of radial distance |
| Answer» E. inversely with the square of radial distance | |
| 21. |
If the pressure at any point in the liquid approaches the vapour pressure, the liquid starts vapourising and creates pockets or bubbles of dissolved gases and vapours. This phenomenon is known as |
| A. | adhesion |
| B. | surface tension |
| C. | vaporisation |
| D. | cavitation |
| Answer» F. | |
| 22. |
Pressure co-efficient is a ratio of pressure forces to |
| A. | Elastic energy forces |
| B. | Viscous forces |
| C. | Gravity forces |
| D. | Intertial forces |
| E. | Surface tension forces |
| Answer» E. Surface tension forces | |
| 23. |
In which of the following cases it is possible for flow to occur from low pressure to high pressure? |
| A. | Flow through a converging section |
| B. | Adiabatic flow in a horizontal pipe |
| C. | Flow of liquid in a vertical pipe |
| D. | Flow of air downward in a pipe |
| E. | None of the above |
| Answer» B. Adiabatic flow in a horizontal pipe | |
| 24. |
A surge tank is provided in the hydropower schemes to |
| A. | minimize the cost of hydro-power development |
| B. | reduce frictional losses in the system |
| C. | reduce water hammer pressures |
| D. | strengthen the penstocks |
| Answer» E. | |
| 25. |
What flow rate in m3/s, is needed using a 20 : 1 scale model of a dam over which 4m3/s of water flows? |
| A. | 0.0068 |
| B. | 0.0022 |
| C. | 0.01 |
| D. | 0.0015 |
| E. | 0.0057 |
| Answer» C. 0.01 | |
| 26. |
In case the resultant of all the forces acting on a dam passes outside the base, the dam would overturn unless |
| A. | Friction pads are provided |
| B. | Coefficient of driction of the material is increased |
| C. | It can resist tensile stress |
| D. | Additional weight is provided on the body of the dam |
| E. | Anchor blocks are provided |
| Answer» D. Additional weight is provided on the body of the dam | |
| 27. |
In case of channels, shooting flow does not occur |
| A. | Directly after a hydraulic jump |
| B. | In a steep channel |
| C. | In a channel with low gradient |
| D. | In a trapezoidal channel |
| E. | In a horizontal channel |
| Answer» B. In a steep channel | |
| 28. |
In a flowing fluid, a particle may possess |
| A. | Pressure energy |
| B. | Elevation or gravitation potential energy |
| C. | Inertial energy |
| D. | Kinetic energy |
| E. | All the above |
| Answer» F. | |
| 29. |
Which type of pump is different from others in the same group? |
| A. | Gear pump |
| B. | Screw pump |
| C. | Lobe pump |
| D. | Plunger pump |
| E. | Cam and piston pump |
| Answer» E. Cam and piston pump | |
| 30. |
Identify the case in which the friction drag is generally larger than pressure drag? |
| A. | Flow past a thin sheet |
| B. | Flow past a cylinder |
| C. | Flow past an aerofoil |
| D. | Flow past a sphere |
| Answer» E. | |
| 31. |
For a flow between two stationary parallel plates the velocity distribution is parabolic. In this case the mean velocity is equal to |
| A. | maximum velocity |
| B. | one-third of the maximum velocity |
| C. | half the maximum velocity |
| D. | two-third of the maximum velocity |
| Answer» F. | |
| 32. |
In parallel pipe problems |
| A. | The pressure gradient remains the same through all the pipes |
| B. | The hydraulic gradient remains the same through all the pipes |
| C. | The head loss is the same through each pipe |
| D. | The head losses through each pipe are added to obtain the total head loss |
| E. | None of the above |
| Answer» D. The head losses through each pipe are added to obtain the total head loss | |
| 33. |
The surface tension has the units |
| A. | Newtons/m |
| B. | Newtons/m2 |
| C. | Newtons/m2 |
| D. | Newtons |
| E. | None of the above |
| Answer» B. Newtons/m2 | |
| 34. |
The ratio inertia forces/surface tension force gives a non-dimensional number known as |
| A. | Cauchy number |
| B. | Euler number |
| C. | Shround number |
| D. | Weber number |
| E. | Froude number |
| Answer» E. Froude number | |
| 35. |
A circular plate 1 m in diameter submerged vertically in water such that its upper edge is 8 m below the free surface of water. The total hydrostatic pressure force on one side of the plate is |
| A. | 65.4 kN |
| B. | 45.0 kN |
| C. | 6.7 kN |
| D. | expands until it fills its space |
| E. | 77.0 kN |
| Answer» D. expands until it fills its space | |
| 36. |
The flow of water in a pipe of diameter 3000 mm can be measured by |
| A. | Rotameter |
| B. | Pitot tube |
| C. | Nozzle |
| D. | Orifice plate |
| E. | Venturimeter |
| Answer» C. Nozzle | |
| 37. |
Which one of the following results in loss in an electric generator |
| A. | Air drag |
| B. | Friction in bearing |
| C. | Direct current power for excitation |
| D. | Heat generated in armature winding |
| E. | All of the above |
| Answer» F. | |
| 38. |
The units of surface tension are |
| A. | Same as units of force |
| B. | Energy/unit area |
| C. | Force/unit area |
| D. | It is dimensionless |
| E. | None of the above |
| Answer» C. Force/unit area | |
| 39. |
Model analysis of aeroplanes and projectiles moving at supersonic speed are based on |
| A. | Weber number |
| B. | Reynold number |
| C. | Froude number |
| D. | Euler number |
| E. | Mach number |
| Answer» F. | |
| 40. |
Which of the following gauge can be used for the measurement of velocity of an aircraft? |
| A. | Ionization chamber |
| B. | Pilot tube |
| C. | Inclined manometer |
| D. | Venturimeter |
| E. | Hot wire anemometer |
| Answer» C. Inclined manometer | |
| 41. |
Which of the following pumping device for supplying water to boiler does not have moving parts? |
| A. | Multistage centrifugal pump |
| B. | Duplex pump |
| C. | Simplex pump |
| D. | Single stage centrifugal pump |
| E. | Steam injector |
| Answer» F. | |
| 42. |
An equipotential line |
| A. | Exists in case of rotational flow |
| B. | Has uniformly varying dynamic pressure |
| C. | Has no velocity component tangent to it |
| D. | Exists in case of turbulent flow only |
| E. | Has no velocity component normal to it |
| Answer» D. Exists in case of turbulent flow only | |
| 43. |
For safety against overturning in a gravity dam, the resultant of all the forces acting on a dam must pass |
| A. | Middle third of the base |
| B. | Outside the base |
| C. | Just at extreme edge of the base |
| D. | First third of the base |
| E. | Within 10% of the extreme edge |
| Answer» B. Outside the base | |
| 44. |
The equation of continuity of flow is applicable when |
| A. | The flow is one dimensional |
| B. | The flow is steady |
| C. | The flow is compressive |
| D. | The velocity is uniform over the cross section |
| E. | None of the above |
| Answer» F. | |
| 45. |
Which one of the following is an integrator |
| A. | Bus-bar |
| B. | Exciter |
| C. | Transformer |
| D. | Lightning arrestor |
| E. | Oil circuit breaker |
| Answer» C. Transformer | |
| 46. |
In a Buttress dam, when the height of dam is 10 m to 25 m, the spacing of buttress is usually restricted to |
| A. | 10 to 15 m |
| B. | 4.5 to 6 m |
| C. | 20 to 25 m. |
| D. | 1.5 m |
| E. | 1 m |
| Answer» C. 20 to 25 m. | |
| 47. |
A simple pitot tube is used to measure |
| A. | The total pressure |
| B. | The undistributed fluid pressure |
| C. | The pressure in a static fluid |
| D. | The velocity in a flowing stream |
| E. | The dynamic pressure |
| Answer» E. The dynamic pressure | |
| 48. |
A hydraulic jump is classified on the basis of initial |
| A. | Weber number |
| B. | Froude number |
| C. | Mach number |
| D. | Reynolds number |
| Answer» C. Mach number | |
| 49. |
In open channels, under critical flow conditions, the velocity head is equal to |
| A. | one-fourth the depth of flow |
| B. | the depth of flow |
| C. | two-thirds of the depth of flow |
| D. | half the depth of flow |
| Answer» F. | |
| 50. |
When the water flows over a rectangular suppressed weir the pressure beneath the nappe is |
| A. | Atmospheric |
| B. | Slightly above atmospheric |
| C. | Vacuum |
| D. | Very high |
| E. | Negative |
| Answer» F. | |