McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering , Mechanical Engineering .
Chapters
| 251. |
The Reyonlds number may be defined as the ratio of |
| A. | Viscous forces to inertial forces |
| B. | Elastic forces to pressure forces |
| C. | Viscous forces to gravity forces |
| D. | Gravity forces to inertial forces |
| E. | None of the above |
| Answer» E. None of the above | |
| 252. |
The maximum velocity through a circular channel takes place when the depth of flow is equal to |
| A. | 0.95 times the diameter |
| B. | 0.25 times the diameter |
| C. | 0.50 times the diameter |
| D. | 0.37 times the diameter |
| E. | 0.81 times the diameter |
| Answer» E. 0.81 times the diameter | |
| 253. |
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 |
| E. | the base |
| Answer» B. at the centre where velocity is maximum | |
| 254. |
The head loss in turbulent flow in a pipe |
| A. | Varies approximately as square of velocity |
| B. | Varies conversely as square of velocity |
| C. | Varies directly as velocity |
| D. | Varies conversely with diameter |
| E. | Varies inversely with diameter |
| Answer» A. Varies approximately as square of velocity | |
| 255. |
A high speed vehicle, travelling at 50 m/s, dips an 80 cm wide scoop into water and deflects the water 180. If it dips 5 cm deep what force, in kN, is exerted on the scoop? |
| A. | 200 |
| B. | 25 |
| C. | 120 |
| D. | 100 |
| E. | 50 |
| Answer» A. 200 | |
| 256. |
A most economical channel section is one which for a given cross-section area |
| A. | Has maximum depth of fluid flowing |
| B. | Has maximum discharge |
| C. | Has maximum hydraulic radius |
| D. | Has maximum wetted perimeter |
| E. | Has maximum velocity of fluid |
| Answer» B. Has maximum discharge | |
| 257. |
Navier-stokes equation is useful in the analysis of |
| A. | Viscous flow |
| B. | Non-viscous flow |
| C. | Rotational flow |
| D. | Turbulent flow |
| E. | Any of the above |
| Answer» A. Viscous flow | |
| 258. |
Which one is different from the others? |
| A. | Warped vane impeller |
| B. | Shrouded impeller |
| C. | Axial flow impeller |
| D. | Mixed flow impeller |
| E. | Open impeller |
| Answer» B. Shrouded impeller | |
| 259. |
The ratio of average velocity to mzximum velocity for steady laminar flow in circular pipes is |
| A. | ? |
| B. | 2 |
| C. | 1 |
| Answer» A. ? | |
| 260. |
The metacentric height of ocean going vessels is usually of the order of |
| A. | 1.8 m to 2.0 m |
| B. | 30 cm to 1.2 m |
| C. | 5 m to 7 m |
| D. | 3 m to 5 m |
| E. | 8 m to 10 m |
| Answer» B. 30 cm to 1.2 m | |
| 261. |
A stepped notch is |
| A. | A notch of varying shapes along the line of flow |
| B. | A combination of triangular notches of different sizes |
| C. | A combination of rectangular notches of different sizes |
| D. | Semi-elliptical in section |
| E. | A combination of triangular and a circular section |
| Answer» C. A combination of rectangular notches of different sizes | |
| 262. |
A perfect gas |
| A. | Has zero viscosity |
| B. | Has constant viscosity |
| C. | Satisfies the relation PV = mRT |
| D. | Is incompressible |
| E. | None of the above |
| Answer» C. Satisfies the relation PV = mRT | |
| 263. |
A piece of cork weighing 4 kg floats in water with 40% of its volume under the liquid. Determine specific gravity of cork. |
| A. | 1 |
| B. | 0.16 |
| C. | 0.4 |
| D. | 0.6 |
| E. | None of the above |
| Answer» C. 0.4 | |
| 264. |
A rotameter is a device used to measure |
| A. | Vortex flow |
| B. | Velocity of gauges |
| C. | Density of fluids |
| D. | Velocity of fluid in pipes |
| E. | Flow of fluids |
| Answer» E. Flow of fluids | |
| 265. |
If the specific speed of a pump is in the range 170 to 400, the type of pump would be |
| A. | Axial flow |
| B. | Radial flow |
| C. | Mixed flow |
| D. | Turbine type |
| E. | None of the above |
| Answer» A. Axial flow | |
| 266. |
A syphon is used to |
| A. | To fill water from a reservoir at lower level to another reservoir with the help of a pump |
| B. | To connect two reservoirs |
| C. | To disconnect water from one reservoir to another |
| D. | To connect two water reservoirs at different levels intervened by a mountain |
| E. | To distribute water from a reservoir at higher level to reservoirs at lower levels |
| Answer» D. To connect two water reservoirs at different levels intervened by a mountain | |
| 267. |
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» C. 6.7 kN | |
| 268. |
The falling drops of rain acquire spherical shape on account of |
| A. | Surface tension |
| B. | Buoyancy |
| C. | Compressibility |
| D. | Viscosity |
| E. | Vapour pressure |
| Answer» A. Surface tension | |
| 269. |
A foot valve is provided on |
| A. | Centrifugal pumps |
| B. | Kaplan turbines |
| C. | Pelton wheels |
| D. | High pressure devices |
| E. | All of the above |
| Answer» A. Centrifugal pumps | |
| 270. |
If the specific speed of a pump is calculated as 5000, the type of pump that should be selected is |
| A. | Axial flow or propeller pump |
| B. | Mixed flow or screw pump |
| C. | Slow speed radial flow |
| D. | Medium speed radial flow |
| E. | High speed radial flow |
| Answer» A. Axial flow or propeller pump | |
| 271. |
Newton's law of viscosity relates |
| A. | Shear stress, temperature, viscosity and velocity |
| B. | Pressure, vicosity and rate of angular deformation |
| C. | Yield shear stress, rate of angular deformation and viscosity |
| D. | Pressure, velocity and viscosity |
| E. | Shear stress and rate of angular deformation in a fluid |
| Answer» E. Shear stress and rate of angular deformation in a fluid | |
| 272. |
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» B. First slowly and then steeply | |
| 273. |
Which of the following forces does not act in case of fluids? |
| A. | Gravity force |
| B. | Elastic force |
| C. | Vibratory force |
| D. | Centrifugal force |
| E. | Tensile force |
| Answer» E. Tensile force | |
| 274. |
A stream line |
| A. | Is the line along the geometrical centre of the flow |
| B. | Is the line of equal velocity in a flow |
| C. | Occurs in all types of flow |
| D. | Is the line along which the rate of pressure drop is uniform |
| E. | Is fixed in space in steady flow |
| Answer» E. Is fixed in space in steady flow | |
| 275. |
A surge wave is an example of |
| A. | 10 |
| B. | steady uniform flow |
| C. | unsteady non-uniform flow |
| D. | steady non-uniform flow |
| E. | unsteady uniform flow |
| Answer» C. unsteady non-uniform flow | |
| 276. |
Find the odd one out |
| A. | Modulus of elasticity |
| B. | 51.3 |
| C. | Unit shear stress |
| D. | Pressure |
| E. | Energy |
| Answer» E. Energy | |
| 277. |
Atmospheric pressure held in terms of water column is |
| A. | 7.5 m |
| B. | 8.5 m |
| C. | 9.81 m |
| D. | 10.30 m |
| E. | None of the above |
| Answer» D. 10.30 m | |
| 278. |
The arch dam is not suitable for |
| A. | Low heads |
| B. | Small discharge |
| C. | Wider sites |
| D. | Narrow sites |
| E. | Small discharge and low heads |
| Answer» C. Wider sites | |
| 279. |
What pressure, in kPa, is equivalent to 600 mm of Hg? |
| A. | 51.3 |
| B. | 100 |
| C. | 80 |
| D. | 55.2 |
| E. | 95.2 |
| Answer» C. 80 | |
| 280. |
Which two forces are most important in laminar flow between closely spaced parallel plates |
| A. | Inertial, viscous |
| B. | Pressure, inertial, inetial |
| C. | Gravity, pressure |
| D. | Viscous, pressure |
| E. | None of the above |
| Answer» A. Inertial, viscous | |
| 281. |
The velocity of flow through homogeneous porous media under constant head is |
| A. | directly proportional to the coefficient of permeability |
| B. | inversely proportional to the coefficient of permeability |
| D. | inversely proportional to the square of the coefficient of permeability |
| E. | directly proportional to the square of the coefficient of permeability |
| Answer» E. directly proportional to the square of the coefficient of permeability | |
| 282. |
It is desired to predict the performance of a large centrifugal pump from that of a scale model one fourth the diameter. The model absorbs 20 HP when pumping under test head of 20 m at its best speed of 400 r.p.m. The large pump is required to pump against 60 m head. The following will be the speed of the pump |
| A. | 173 RPM |
| B. | 153 RPM |
| C. | 208 RPM |
| D. | 100 RPM |
| E. | 167 RPM |
| Answer» A. 173 RPM | |
| 283. |
The angle of taper on a draft tube is |
| A. | More than 15? |
| B. | Around 10? |
| C. | Less than 7 |
| D. | More than 20? |
| E. | Around 15? |
| Answer» C. Less than 7 | |
| 284. |
To determine the reservoir storage capacity for a given uniform demand, one of the following data is most useful |
| A. | Daily flow-duration curve of the stream at the dam site |
| B. | 1.25 |
| C. | Stage discharge relation for the stream at the reservoir site |
| D. | Mass curve of the flow volume for several consecutive years |
| E. | Unit hydrograph of the basin |
| Answer» D. Mass curve of the flow volume for several consecutive years | |
| 285. |
If the Mach number of a flow is 3 the flow is known as |
| A. | Super-supersonic |
| B. | Supersonic |
| C. | Sonic |
| D. | Sub-sonic |
| E. | None of the above |
| Answer» B. Supersonic | |
| 286. |
Select the correct statement regarding frictionless flow |
| A. | The velocity is always sonic at the throat of a converging diverging tube |
| B. | In diverging conduits the velocity always decreases |
| C. | On supersonic flow the area decreases for increasing velocity |
| D. | Sonic velocity cannot be exceeded at the throat of a converging diverging tube |
| E. | Less than 3 m of water |
| Answer» C. On supersonic flow the area decreases for increasing velocity | |
| 287. |
Pascal's law states that pressure at a point is equal in all directions |
| A. | In a liquid at rest |
| B. | In a fluid at rest |
| C. | In a laminar flow |
| D. | In a turbulent flow |
| E. | None of the above |
| Answer» B. In a fluid at rest | |
| 288. |
A practical example of steady non-uniform flow is given as the |
| A. | Flow through venturimeter |
| B. | Motion of a river around the pillars of a bridge |
| C. | Constant discharge through straight tapering draft tube turbine |
| D. | Flow through delivery pipe of a reciprocating pump |
| E. | Steadily decreasing flow through a reducing section |
| Answer» C. Constant discharge through straight tapering draft tube turbine | |
| 289. |
If a centrifugal pump takes too much power, the cause may be |
| A. | Air in water |
| B. | Foot valve too small |
| C. | Air leakage |
| D. | Low speed |
| E. | Heavy liquid. |
| Answer» E. Heavy liquid. | |
| 290. |
Out ward radial flow turbines |
| A. | Are impulse type |
| B. | Are reaction type |
| C. | Are partly impulse partly reaction |
| D. | May be impulse or reaction type |
| E. | None of the above |
| Answer» D. May be impulse or reaction type | |
| 291. |
The statement "For laminar flow through a fine porous bed or capillary passages in a solid, the velocity based on the total cross-section is proportional to the ratio of pressure gradient to viscosity" is known as |
| A. | Schmidt's law |
| B. | Fick's law |
| C. | Reynolds hypothesis |
| D. | Stock's law |
| E. | Darcy's law of permeability |
| Answer» E. Darcy's law of permeability | |
| 292. |
Cavitation is caused by |
| A. | Low velocity |
| B. | Low pressure |
| C. | High velocity |
| D. | Low barometric pressure |
| E. | High pressure |
| Answer» B. Low pressure | |
| 293. |
The thickness of turbulent boundary layer at a distance x from the leading edge over a flat plate varies as |
| A. | x1/2 |
| B. | x5/3 |
| C. | x5/4 |
| D. | x4/5 |
| E. | x3/5 |
| Answer» D. x4/5 | |
| 294. |
In Hagen-poiseuille flow of viscous liquid, one of the following pairs of forces strike a balance |
| A. | Pressure and viscous forces |
| B. | Inertia and gravity forces |
| C. | 3 |
| D. | Gravity and viscous forces |
| E. | Inertia and viscous forces |
| Answer» E. Inertia and viscous forces | |
| 295. |
A plot between power generated in MW and time is known as |
| A. | Load curve |
| B. | Load duration curve |
| C. | Load factor |
| D. | Demand curve |
| E. | None of the above |
| Answer» A. Load curve | |
| 296. |
Mercury is suitable for manometers because |
| A. | It moves easily |
| B. | It does not stick to tube walls |
| C. | It has high density |
| D. | It can be easily seen in tube |
| E. | It is generally not used in manometers |
| Answer» E. It is generally not used in manometers | |
| 297. |
The glass is considered as a |
| A. | frozen liquid |
| C. | liquid metal |
| D. | crystal |
| E. | solid |
| Answer» A. frozen liquid | |
| 298. |
The river flow during floods can be classified as |
| A. | Unsteady uniform flow |
| C. | unsteady non-uniform flow |
| D. | Steady uniform flow |
| E. | steady non-uniform flow |
| Answer» C. unsteady non-uniform flow | |
| 299. |
A hydraulic intensifier is a device |
| A. | To lift small quantities of water through large head by means of large quantity of water falling through small height |
| B. | To generate high pressure |
| C. | To increase the intensity of pressure of water by means of the energy of a large quantity of water at low pressure |
| D. | To temporarily store the energy of water |
| E. | None of the above |
| Answer» C. To increase the intensity of pressure of water by means of the energy of a large quantity of water at low pressure | |
| 300. |
The angle of contact (0) between mercury and glass tube in case of capillary depression is |
| A. | 128? |
| B. | 157? |
| C. | 10? |
| D. | 90? |
| E. | 0? |
| Answer» A. 128? | |
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