McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering , Mechanical Engineering .
Chapters
| 251. |
Eulers dimensionless number relates the following |
| A. | None |
| B. | Pressure force and viscous force |
| C. | Inertial force and gravity |
| D. | Viscous force and inertial |
| E. | Pressure force and inertial force |
| Answer» E. Pressure force and inertial force | |
| 252. |
Tranqil flow must always occur |
| A. | Below normal depth |
| B. | Above normal depth |
| C. | Above critical depth |
| D. | Below critical depth |
| E. | At normal depth |
| Answer» C. Above critical depth | |
| 253. |
An orifice is said to be a large orifice when |
| A. | Electrical conductivity |
| B. | An orifice can discharge fluid within 10 minutes |
| C. | The cross-section of orifie is not less than 10% of the cross-section of tank |
| D. | The head over the orifice is smaller than its vertical dimensions |
| Answer» D. The head over the orifice is smaller than its vertical dimensions | |
| 254. |
When the Reynolds number is less than 500 the flow is said to be laminar for |
| A. | pipe flow |
| B. | flow between parallel plates |
| C. | free surface flow |
| D. | all of the above |
| Answer» D. all of the above | |
| 255. |
If the forces due to inertia, gravity and frictional resistance are insignificant, the design of a channel may be made by comparing |
| A. | Reynolds number |
| B. | Weber number |
| C. | Froude's number |
| D. | Schmidt number |
| E. | Prandt number |
| Answer» C. Froude's number | |
| 256. |
The maximum continuous power available from a hydro-electric plant under the most adverse hydraulic conditions is known as |
| A. | Primary power |
| B. | Firm power |
| C. | Installed capacity |
| D. | Base power |
| E. | Secondary power |
| Answer» B. Firm power | |
| 257. |
Boundary layer thickness (?) is the distance from the surface of the solid body in the direction perpendicular to flow, where the velocity of fluid is equal to |
| A. | Free stream velocity |
| B. | 0.9 times the free stream velocity |
| C. | 0.99 times the free stream velocity |
| D. | None of the above |
| E. | Free vortex motion |
| Answer» C. 0.99 times the free stream velocity | |
| 258. |
Capallary waves in channels, capillary rise in narrow passages are the instances where |
| B. | surface tension is negligible |
| C. | elastic forces are prefominant |
| D. | surface tension cannot be neglected |
| E. | viscous forces play a dominant role |
| Answer» D. surface tension cannot be neglected | |
| 259. |
Drag force in not a function of |
| A. | mass density of the fluid |
| B. | mass density of the body |
| D. | velocity of the body |
| E. | projected area of the body |
| Answer» B. mass density of the body | |
| 260. |
In Buttress dam, too flat a slope causes |
| A. | A very high inclined stress at the heel |
| B. | Overloading of buttress sections |
| C. | Excessive tensile stress on upstream face |
| D. | Increased tendency to overturning |
| E. | Excessive tensile stresses in the foundation and the body of the dam |
| Answer» A. A very high inclined stress at the heel | |
| 261. |
The flow between any two stream lines |
| A. | decreases along its path |
| C. | remains the same |
| D. | increases along its path |
| E. | is always zero |
| Answer» C. remains the same | |
| 262. |
A streamline |
| A. | is the line of equal velocity in a flow |
| B. | occurs on all types of flows |
| C. | is fixed in space in space flow |
| D. | 51.3 |
| E. | is the line along geometrical centre of the flow |
| Answer» C. is fixed in space in space flow | |
| 263. |
One poise is equivalent to |
| A. | 360 kg/m-hr |
| B. | 1 dyne sec/cm2 |
| C. | 1/98.1 kgf sec/m2 |
| D. | 10-1 kg/m-sec |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 264. |
The magnitude of earthquake pressure on a dam varies as a function of |
| A. | Frequency of vibration and amplitude |
| B. | Richard's scale number |
| C. | Amplitude |
| D. | Frequency of vibration |
| E. | Amplitude and intensity |
| Answer» A. Frequency of vibration and amplitude | |
| 265. |
Mercury is generally used in barometer because |
| A. | It does not stick to the tube walls |
| B. | It has practically zero vapour pressure |
| C. | All above |
| D. | It shines and can be easily read |
| E. | Of higher density due to which the height of barmeter will be small |
| Answer» E. Of higher density due to which the height of barmeter will be small | |
| 266. |
Model analysis of free surface flows are based on |
| A. | Reynold's no |
| B. | Greater than ten |
| C. | Mach no. |
| D. | Froude no. |
| E. | Euler no. |
| Answer» D. Froude no. | |
| 267. |
World's largest capacity hydro-electric generating plant is located in |
| A. | U.S.S.R. |
| B. | U.S.A. |
| C. | France |
| D. | India |
| E. | Germany |
| Answer» A. U.S.S.R. | |
| 268. |
A Pelton wheel is |
| A. | Inward flow reaction turbine |
| B. | Outward flow impulse turbine |
| C. | Axial flow impulse turbine |
| D. | Aoutward flow reaction turbine |
| E. | Inward flow impulse turbine |
| Answer» C. Axial flow impulse turbine | |
| 269. |
The centre of buoyancy is |
| A. | Centroid of displaced volume of fluid |
| B. | Mid-point between C.G. and metacentre |
| C. | The point of intersection of the buoyant force and the centre line of the body |
| D. | Centre of gravity of the body |
| E. | When the metacentre is below C.G. |
| Answer» A. Centroid of displaced volume of fluid | |
| 270. |
If a centrifugal pump is noisy in operation, the cause may be |
| A. | Air in water |
| B. | Discharge head too high |
| C. | Mechanical defect |
| D. | Suction head too high |
| E. | Priming faulty |
| Answer» C. Mechanical defect | |
| 271. |
An object having 20 kg mass weighs 19.60 kg on a spring type balance. The value of 'g' in m/sec2 for the place is |
| A. | 1000 |
| B. | 10.1 |
| C. | 9.8 |
| D. | 10.2 |
| E. | 9.9 |
| Answer» E. 9.9 | |
| 272. |
The loss of head due to sudden enlargement is attributed to |
| A. | roughness of the pipe |
| C. | production and dissipation of turbulent energy |
| D. | viscosity of fluid |
| E. | generation of heat |
| Answer» C. production and dissipation of turbulent energy | |
| 273. |
Specific speed for reaction turbine ranges from |
| A. | 10 - 110 |
| B. | 3 - 710 |
| C. | 200 - 300 |
| D. | More than 300 |
| E. | 125 - 180 |
| Answer» A. 10 - 110 | |
| 274. |
In a turbine installation gross head is defined as |
| A. | The difference of level between the head race and the tail race |
| B. | The difference of level between reservoir and downstream |
| C. | The difference of head between axis of turbine to discharge stream level |
| D. | The head actually used in developing power |
| E. | None of the above |
| Answer» A. The difference of level between the head race and the tail race | |
| 275. |
A liquid compressed in a cylinder has a volume of 1 litre at 1 MN/m2 and a volume of 995 cu-cm at 2 MN / m2. The bulk modulus of elasticity would be |
| A. | 10 Mpa |
| B. | 200 Mpa |
| C. | Mpa |
| D. | 5 Mpa |
| E. | 20 Mpa |
| Answer» B. 200 Mpa | |
| 276. |
Identify the correct statement |
| A. | Frictional resistance in a pipe depends on the square of area of the wetted surface |
| B. | Frictional resistance in a pipe decreases with density of the fluid |
| C. | Frictional resistance in a pipe is dependent on the fluid pressure |
| D. | Frictional resistance in a pipe increases with the square of velocity |
| E. | Frictional resistance in a pipe is independent on surface roughness |
| Answer» D. Frictional resistance in a pipe increases with the square of velocity | |
| 277. |
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» C. It can resist tensile stress | |
| 278. |
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» E. Mach number | |
| 279. |
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» B. Energy/unit area | |
| 280. |
Water enters a turbine at 900 kPa with negligible velocity. What maximum speed, in m/s, can it reach before it enters the turbine rotor? |
| A. | 51.3 |
| B. | 52 |
| C. | 42 |
| D. | 47 |
| E. | 45 |
| Answer» E. 45 | |
| 281. |
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» D. Intertial forces | |
| 282. |
Which conduit entrance is expected to have least loss coeffieient? |
| A. | Circular bell mouth entrances |
| B. | Square cornered entrance |
| C. | Square bell mouth entrances |
| D. | Slightly rounded entrance |
| E. | Inward projecting entrances |
| Answer» A. Circular bell mouth entrances | |
| 283. |
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» E. All of the above | |
| 284. |
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 |
| D. | reduce water hammer pressures |
| E. | strengthen the penstocks |
| Answer» D. reduce water hammer pressures | |
| 285. |
The boundary layer separation takes place if |
| A. | Pressure gradient is zero |
| B. | Pressure gradient is positive |
| C. | Pressure gradient is negative |
| D. | None of the above |
| E. | None of the these answers |
| Answer» B. Pressure gradient is positive | |
| 286. |
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» B. Pilot tube | |
| 287. |
Submerged weight of a body is |
| A. | less than its weight in air |
| B. | equal to its weight in air |
| C. | greater than its weight in air |
| E. | greater than its weight in vacuum |
| Answer» A. less than its weight in air | |
| 288. |
In MLT units, velocity potential is expressed as |
| A. | LT-2 |
| B. | L2T |
| C. | L2T-1 |
| D. | 2.45 |
| E. | L2T-2 |
| Answer» C. L2T-1 | |
| 289. |
The continuity equation in ideal fluid flow |
| A. | Applies to irrotational flow only |
| B. | States that the net rate of in-flow into any small volume must be zero |
| C. | States that the energy remains constant along stream line |
| D. | States that energy is constant everywhere in the fluid |
| E. | Impulses to existence of a velocity potential |
| Answer» D. States that energy is constant everywhere in the fluid | |
| 290. |
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» C. Increases | |
| 291. |
A Francis turbine is |
| A. | Inward flow reaction turbine |
| B. | Inward flow impulse turbine |
| C. | Outward flow reaction turbine |
| D. | Outward flow impulse turbine |
| E. | None of the above |
| Answer» A. Inward flow reaction turbine | |
| 292. |
Portion of the installed reserve kept in operable condition but not placed in service to supply the peak load is known as |
| A. | Spinning reserve |
| B. | Operating reserve |
| C. | None-spinning reserve |
| D. | Hot reserve |
| E. | Cold reserve |
| Answer» E. Cold reserve | |
| 293. |
The continuity equation |
| A. | Expresses relationship between hydraulic parameters of flow |
| B. | Relates the mass rate of flow along a stream line |
| C. | Is based on Bernoulli's theorem |
| D. | Is a relation for the momentum per unit volume for two points on a stream line |
| E. | Expresses the relation between work and energy |
| Answer» B. Relates the mass rate of flow along a stream line | |
| 294. |
The radial component of velocity in a free vortex is |
| A. | inversely proportional to the square of the radial distance |
| B. | zero |
| D. | directly proportional to the radial distance |
| E. | inversely proportional to the radial distance |
| Answer» B. zero | |
| 295. |
For a flow between two stationary parallel plates the velocity distribution is parabolic. In this case the mean velocity is equal to |
| B. | maximum velocity |
| C. | one-third of the maximum velocity |
| D. | half the maximum velocity |
| E. | two-third of the maximum velocity |
| Answer» E. two-third of the maximum velocity | |
| 296. |
The most popular generation voltage in hydro-electric power stations in India is |
| A. | 440 kV |
| B. | 220 V |
| C. | 440 V |
| D. | 6600 V |
| E. | 11000 V |
| Answer» E. 11000 V | |
| 297. |
The Boundary layer on a flat plate is calld laminar boundary layer if |
| A. | Reynold No. is less than 2000 |
| B. | Reynold No. is less that 4000 |
| C. | Reynold No. is less than 5 x 105 |
| D. | None of the above |
| E. | None of the above |
| Answer» C. Reynold No. is less than 5 x 105 | |
| 298. |
A fluid is a substance that |
| A. | Is practically incompressible |
| B. | Has the same shear stress at a point regardless of its motion |
| C. | Cannot be subjected to shear forces |
| D. | Cannot remain at rest under action of any sher force |
| E. | Always expands until it fills any container |
| Answer» B. Has the same shear stress at a point regardless of its motion | |
| 299. |
A critical depthmeter is used to measure |
| A. | Discharge in an open channel |
| B. | Depth of oceans and rivers |
| C. | Rise in head during hydraulic jump |
| D. | Effective head of fluid flowing in a pipe |
| E. | Rise in head during water hammer |
| Answer» A. Discharge in an open channel | |
| 300. |
The force acting on a gravity dam which causes stability is |
| A. | Reservoir water pressure |
| B. | Uplift |
| C. | Weight of the dam |
| D. | Wind pressure |
| E. | Earth and silt pressure |
| Answer» C. Weight of the dam | |
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