McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering , Mechanical Engineering .
Chapters
| 151. |
SI unit of viscosity is |
| A. | 10 times poise |
| B. | 9.81 times poise |
| C. | 1/9.81 times poise |
| D. | Equal to poise |
| E. | None of the above |
| Answer» A. 10 times poise | |
| 152. |
If the specific speed of turbine is more than 300, the type of turbine is |
| A. | Kaplan |
| B. | Pelton with nose jets |
| C. | Greater than ten |
| D. | Pelton |
| E. | Francis |
| Answer» A. Kaplan | |
| 153. |
The velocity distribution in a turbulent flow in a pipe is often assumed to |
| A. | be zero at the wall and increase linearly to the centre |
| B. | vary according to the 1/7 th power law |
| C. | be maximum at the wall and decrease linearly to the centre |
| D. | be unpredictable and is thus not used |
| E. | vary parabolically |
| Answer» B. vary according to the 1/7 th power law | |
| 154. |
Which conduit entrance is expected to have highest loss coefficient? |
| A. | Gate in thin wall-unsuppressed contraction |
| B. | Fully rounded entrance having x/D>0.15 |
| C. | Gate in thin wall-bottom and side suppressed |
| D. | Inward projecting entrances |
| E. | Gate in thin wall-corners rounded |
| Answer» A. Gate in thin wall-unsuppressed contraction | |
| 155. |
The principle, "The buoyancy is equal to the weight of the fluid displaced and the line of action is through the centroid of the displaced mass" is known as |
| A. | Newton's law |
| B. | Bernoulli's law |
| C. | First law of fluid mechanics |
| D. | Law of buoyancy |
| E. | Archimedes principle |
| Answer» E. Archimedes principle | |
| 156. |
Predict the pressure, in kPa, at an elevation of 2000 m, in an isothermal atmosphere assuming T = 20?C. Assume Patm = 100 kPa |
| A. | 71 |
| B. | 79 |
| C. | 87 |
| D. | 82 |
| E. | 63 |
| Answer» B. 79 | |
| 157. |
The distance from pipe boundary, at which the point velocity is equal to average velocity in case of turbulent flow (when R is the radius of the pipe), is |
| A. | 0.892 R |
| B. | 0.223 R |
| D. | 0.446 R |
| E. | 0.111 R |
| Answer» B. 0.223 R | |
| 158. |
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» D. Newtonian fluid | |
| 159. |
The minimum diameter necessary to avoid the capillary rise in the manometer is |
| A. | 6 mm |
| C. | 1 mm |
| D. | 3 mm |
| E. | 15 mm |
| Answer» A. 6 mm | |
| 160. |
Which of the following forces do not act on fluids |
| A. | Gravity |
| B. | Viscous force |
| C. | Torsion |
| D. | Inertia |
| E. | Pressure |
| Answer» C. Torsion | |
| 161. |
In a centrifugal pump casing, the flow of water leaving the impeller is |
| A. | Radial flow |
| B. | Forced vortex motion |
| C. | Centrifugal flow |
| D. | Free vortex motion |
| E. | Rectilinear flow |
| Answer» D. Free vortex motion | |
| 162. |
Fresh water 2 m deep flows over the top of 4 m of salt water (S = 1.04). The pressure at the bottom, in kPa, is |
| A. | 60.4 |
| B. | 58.8 |
| C. | 55.2 |
| D. | 51.3 |
| E. | 47.9 |
| Answer» A. 60.4 | |
| 163. |
Hydraulic jump is used for |
| A. | Reducing the velocity of flow |
| B. | Reducing the energy of flow |
| C. | Increasing the flow rate |
| D. | Reducing the flow rate |
| E. | Reducing turbulence |
| Answer» B. Reducing the energy of flow | |
| 164. |
When the rheogram for a fluid at any temperature and pressure is a straight line passing through origin, the fluid is said to be |
| B. | Newtonian |
| C. | Non-Newtonian |
| D. | Bingham |
| E. | Ideal plastic |
| Answer» B. Newtonian | |
| 165. |
The miaimum thickness of boundary layer in a pipe of radius R is |
| A. | 0.22 R |
| B. | R |
| D. | 0.5 R |
| E. | 0.1 R |
| Answer» B. R | |
| 166. |
The hydrostatic law states that rate of increase of pressure in a vertical direction is equal to |
| A. | Density of the fluid |
| B. | Specific weight of the fluid |
| C. | Weight of the fluid |
| D. | None of the above |
| E. | Is practically incompressible |
| Answer» B. Specific weight of the fluid | |
| 167. |
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 |
| E. | half the depth of flow |
| Answer» E. half the depth of flow | |
| 168. |
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» E. Steam injector | |
| 169. |
Which one of the following is laminar flow |
| A. | Rise of water in plants through roots |
| B. | Movement of blood in the arteries of a human body |
| C. | Flow of oil in measuring instruments |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 170. |
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» D. The velocity in a flowing stream | |
| 171. |
The wake |
| A. | Always occurs after a separation point |
| B. | Is the principal cause of skin friction |
| C. | Always occurs when deformation drag predominates |
| D. | Is none of these answers |
| E. | Is a region of high pressure |
| Answer» C. Always occurs when deformation drag predominates | |
| 172. |
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» A. Middle third of the base | |
| 173. |
A current meter is used for the measurement of |
| A. | Electrical charge on fluids |
| B. | Velocity |
| C. | Electrical conductivity |
| D. | Pressure |
| E. | Viscosity |
| Answer» B. Velocity | |
| 174. |
Rocks that undergo notable expansion without flow due to preence of clay minerals, are known as |
| A. | Swelling rocks |
| B. | Moderately jointed rocks |
| C. | Seamy rocks |
| D. | Schistos rocks |
| E. | Squeezing rocks |
| Answer» A. Swelling rocks | |
| 175. |
Which one of the following is an integrator |
| A. | Bus-bar |
| B. | Exciter |
| C. | Transformer |
| D. | Lightning arrestor |
| E. | Oil circuit breaker |
| Answer» B. Exciter | |
| 176. |
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» B. 4.5 to 6 m | |
| 177. |
A mercury water manometer indicates a gauge difference of 400 mm. The difference in pressure, measured in metres of water, is |
| A. | 0.4 |
| B. | 0.8 |
| C. | 1088 |
| D. | 5.44 |
| E. | None of the above |
| Answer» D. 5.44 | |
| 178. |
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» E. None of the above | |
| 179. |
A turbine model test with 260 mm diameter showed an efficiency of 90 percent. The efficiency that can be expected from a 1.2 m diameter impeller is |
| A. | 90 percent |
| B. | 81 percent |
| C. | 91 percent |
| D. | 93.18 percent |
| E. | None of the above |
| Answer» D. 93.18 percent | |
| 180. |
Notch is a device used for measuring |
| B. | Velocity through a pipe |
| C. | Rate of flow through a small channel |
| D. | Velocity through a small channel |
| E. | Rate of flow through pipes |
| Answer» C. Rate of flow through a small channel | |
| 181. |
While calculating the specific speed of double suction pump, the discharge to be considered is |
| A. | Square of the actual discharge |
| B. | Actual discharge |
| C. | Double of the actual discharge |
| D. | Square root of actual discharge |
| E. | Half of actual discharge |
| Answer» E. Half of actual discharge | |
| 182. |
In an impulse turbine |
| A. | Water must be admitted over the whole circumference |
| B. | It is not possible to regulate the flow without loss |
| C. | Wheel must run full and kept entirely submerged in water below the tailrace |
| D. | The pressure in the driving fluid as it moves over the vanes is atmospheric |
| E. | None of the above |
| Answer» D. The pressure in the driving fluid as it moves over the vanes is atmospheric | |
| 183. |
The Weber number is the ratio of |
| A. | Inertial forces to surface tension force |
| B. | Elastic forces to pressure forces |
| C. | Viscous forces to gravity |
| D. | Elastic forces to gravity |
| E. | Intertial forces to viscous forces |
| Answer» A. Inertial forces to surface tension force | |
| 184. |
A hydraulic jump is classified on the basis of initial |
| A. | Weber number |
| B. | Froude number |
| C. | Mach number |
| D. | Reynolds number |
| Answer» B. Froude number | |
| 185. |
Water hammer in pipes takes place when |
| A. | 51.3 |
| B. | flowing fluid is gradually brought to rest |
| C. | fluid is flowing with high pressure |
| D. | fluid is flowing with high velocity |
| E. | flowing fluid is suddenly brought to rest by closing the valve |
| Answer» B. flowing fluid is gradually brought to rest | |
| 186. |
Multistage centrifugal pumps are used |
| A. | To produce high heads |
| B. | To give high discharge |
| C. | A and B above together |
| D. | To pump viscous liquids |
| E. | None of the above |
| Answer» A. To produce high heads | |
| 187. |
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» E. Negative | |
| 188. |
Water flows through a 2 cm dia. Pipe at 20 m/s. It then flows radially outward between two discs, 2 mm apart. When it reaches a radius of 40 cm its velocity, in m/s will be |
| A. | 1.85 |
| B. | 2.5 |
| C. | 1.25 |
| D. | 5 |
| E. | 2.25 |
| Answer» C. 1.25 | |
| 189. |
Stremlines, streak lines and path lines are all identical in case of |
| A. | Steady flow |
| B. | Rotation flow |
| C. | Non-uniform flow |
| D. | Uniform flow |
| E. | Unsteady flow |
| Answer» A. Steady flow | |
| 190. |
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» C. Has no velocity component tangent to it | |
| 191. |
The unit hydrograph may be obtained by dividing the ordinates of the direct run-off hydrograph of a storm by |
| A. | total run off volume |
| B. | duration of unit hydrograph |
| D. | storm duration |
| E. | direct run-off volume |
| Answer» E. direct run-off volume | |
| 192. |
The stress in the dam should be within the specified limits for the body of dam in the foundations. If the stress at the toe and heel are excessive, they can be brought within permissible limits by |
| A. | Grouting |
| B. | Providing anchor blocks |
| C. | Providing friction blocks |
| D. | Providing filters |
| E. | Any of the above |
| Answer» D. Providing filters | |
| 193. |
Hammer blow in pipe occurs when |
| A. | Flow of fluid through pipe is suddenly brought to rest by the closing of the valve |
| B. | Pipe bursts under high fluid pressure |
| C. | Flow of fluid through pipe is gradually brought to rest by the closing of valve |
| D. | Excessive leakage occurs in pipe |
| E. | Pipe is hit with hammer |
| Answer» A. Flow of fluid through pipe is suddenly brought to rest by the closing of the valve | |
| 194. |
The loss of pressure head for the laminar flow through pipes varies |
| A. | As the square of velocity |
| B. | Directly as the velocity |
| C. | As the inverse of the velocity |
| D. | None of the above |
| E. | None of the above |
| Answer» B. Directly as the velocity | |
| 195. |
The oscillatory motion of a ship or a boat about its longitudinal axis is designated as |
| A. | Vibration |
| B. | Pitching |
| C. | Simple harmonic motion |
| D. | Gyro-mtion |
| E. | Rolling |
| Answer» E. Rolling | |
| 196. |
The surface tension has the units |
| A. | Newtons/m |
| B. | Newtons/m2 |
| C. | Newtons/m2 |
| D. | Newtons |
| E. | None of the above |
| Answer» A. Newtons/m | |
| 197. |
A small-size nozzle is built into a Pelton turbine for directing its water jet towards the back of the bucket, so that machine can be stopped quickly, is known as |
| A. | Reverse nozzle |
| B. | Compensating nozzle |
| C. | Brake nozzle |
| D. | Any of the above |
| E. | None of the above |
| Answer» C. Brake nozzle | |
| 198. |
In case of Buttress dams, too steep slopes |
| A. | Increase the tendency to sliding |
| B. | Increase inclined stress at heel |
| C. | Increase tendency to over turning |
| D. | Increase tensile stress on upstream side of dam |
| E. | Increase stresses at heels only |
| Answer» A. Increase the tendency to sliding | |
| 199. |
The lift on the cylinder caused by the circulation is independent of |
| A. | velocity |
| B. | cylinder diameter |
| C. | magnitude of circulation |
| D. | None of the above |
| Answer» B. cylinder diameter | |
| 200. |
How many dimensionless parameters can be obtained for a physical phenomenon having 7 varieables involving 3 fundamental dimensions? |
| A. | 4 |
| B. | 3 |
| C. | 7 |
| D. | 10 |
| Answer» A. 4 | |
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