McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering , Mechanical Engineering .
Chapters
| 51. |
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 | |
| 52. |
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 | |
| 53. |
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 | |
| 54. |
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 | |
| 55. |
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 | |
| 56. |
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 | |
| 57. |
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 | |
| 58. |
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. | |
| 59. |
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. | |
| 60. |
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 | |
| 61. |
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 | |
| 62. |
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 | |
| 63. |
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 | |
| 64. |
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 | |
| 65. |
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 | |
| 66. |
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 | |
| 67. |
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 | |
| 68. |
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 | |
| 69. |
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 | |
| 70. |
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 | |
| 71. |
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 | |
| 72. |
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 | |
| 73. |
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 | |
| 74. |
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 | |
| 75. |
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 | |
| 76. |
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 | |
| 77. |
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 | |
| 78. |
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 | |
| 79. |
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 | |
| 80. |
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 | |
| 81. |
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 | |
| 82. |
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 | |
| 83. |
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 | |
| 84. |
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 | |
| 85. |
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 | |
| 86. |
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 | |
| 87. |
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 | |
| 88. |
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 | |
| 89. |
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 | |
| 90. |
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 | |
| 91. |
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 | |
| 92. |
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 | |
| 93. |
A stationary body immersed in a river has a maximum pressure of 69 Kpa exerted on it at a distance of 5.4 m below the free surface. What velocity of river could be expected ? |
| A. | 9 m/sec |
| B. | 5.4 m/sec |
| C. | 3.82 m/sec |
| D. | 5.67 m/s |
| E. | None of the above |
| Answer» D. 5.67 m/s | |
| 94. |
In reaction turbine the draft tube is used |
| A. | To increase the effective head |
| B. | To prevent air from entering |
| C. | To reconvert kinetic energy to flow energy by a gradual expansion of the flow cross-section |
| D. | To transport water to downstream without eddies |
| E. | To run the turbine full |
| Answer» C. To reconvert kinetic energy to flow energy by a gradual expansion of the flow cross-section | |
| 95. |
Air vessels in a reciprocating pump is |
| A. | Fitted in the suction line |
| B. | Fitted in the delivery line |
| C. | A cast iron chamber having an opening at the base |
| D. | A, B and C above together |
| E. | None of the above |
| Answer» D. A, B and C above together | |
| 96. |
If a water tank partially filled with water is being carried on a truck with a constant horizontal acceleration, the level of liquid will |
| A. | Rise on the front side of the tank |
| B. | Rise on the back side of the tank and fall on front |
| C. | Fall on the front side of the tank |
| D. | Front side fluctuate considerably |
| E. | Fall on the back side of the tank and rise on front |
| Answer» B. Rise on the back side of the tank and fall on front | |
| 97. |
The pressure centre is |
| A. | A point on the line of action of the resultant force |
| B. | At the centroid of the submerged area |
| C. | Independent of the orientation of the area |
| D. | Always above the centroid of area |
| E. | The centroid of the pressure prism |
| Answer» A. A point on the line of action of the resultant force | |
| 98. |
An ideal fluid is |
| A. | One which flows through pipes with least friction |
| B. | One which obeys Newton's law of viscosity |
| C. | One which satisfies continuity equation |
| D. | Similar to a perfect gas |
| E. | Frictionless and incompressible |
| Answer» E. Frictionless and incompressible | |
| 99. |
The general energy equation is applicable to |
| A. | Turbulent flow |
| B. | Unsteady flow |
| C. | Laminar flow |
| D. | Steady flow |
| E. | Non-uniform flow |
| Answer» D. Steady flow | |
| 100. |
In a venturimeter |
| A. | Length of divergent cone is equal to the length of conergent cone |
| B. | Length of divergent cone is half that of convergent cone |
| C. | Divergent cone is kept shorter than convergent cone |
| D. | Divergent cone is kept longer than the convergent cone |
| E. | None of the above |
| Answer» B. Length of divergent cone is half that of convergent cone | |
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