MCQOPTIONS
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MCQOPTIONS
This section includes 905 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
_ The total energy line lies over the centre line of the pipe by an amount equal to$? |
| A. | Pressure head |
| B. | Velocity head |
| C. | Pressure head + velocity head |
| D. | Pressure head - velocity head |
| Answer» D. Pressure head - velocity head | |
| 552. |
_ An average value of coefficient of velocity is$? |
| A. | 0.62 |
| B. | 0.76 |
| C. | 0.84 |
| D. | 0.97 |
| Answer» E. | |
| 553. |
_ Delivery head of a centrifugal pump is$? |
| A. | Directly proportional to N |
| B. | Inversely proportional to N |
| C. | Directly proportional to N² |
| D. | Inversely proportional to N² |
| Answer» D. Inversely proportional to N¬¨‚⧠| |
| 554. |
_ According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)$? |
| A. | A √ó M √ó m1/2 √ó i2/3 |
| B. | A √ó M √ó m2/3 √ó i1/2 |
| C. | A1/2 √ó M2/3 √ó m √ó i |
| D. | A2/3 √ó M1/3 √ó m √ó i |
| Answer» C. A1/2 ‚àö√≥ M2/3 ‚àö√≥ m ‚àö√≥ i | |
| 555. |
_ Which of the following instruments is used to measure flow on the application of Bernoulli's theorem?$? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | Nozzle |
| D. | All of the above |
| Answer» E. | |
| 556. |
_ The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)$? |
| A. | L.A.N |
| B. | 2 L.A.N |
| C. | (L.A.N)/60 |
| D. | (2 L.A.N)/60 |
| Answer» E. | |
| 557. |
_ The region between the separation streamline and the boundary surface of the solid body is known as$? |
| A. | Wake |
| B. | Drag |
| C. | Lift |
| D. | Boundary layer |
| Answer» B. Drag | |
| 558. |
_ The line of action of the buoyant force acts through the$? |
| A. | Centroid of the volume of fluid vertically above the body |
| B. | Centre of the volume of floating body |
| C. | Center of gravity of any submerged body |
| D. | Centroid of the displaced volume of fluid |
| Answer» E. | |
| 559. |
_ The property of fluid by virtue of which it offers resistance to shear is called$? |
| A. | Surface tension |
| B. | Adhesion |
| C. | Adhesion |
| D. | Viscosity |
| Answer» E. | |
| 560. |
_ According to Bernoulli's equation for steady ideal fluid flow$? |
| A. | Principle of conservation of mass holds |
| B. | Velocity and pressure are inversely proportional |
| C. | Total energy is constant throughout |
| D. | The energy is constant along a streamline but may vary across streamlines |
| Answer» E. | |
| 561. |
_ Impulse turbine is generally fitted$? |
| A. | At the level of tail race |
| B. | Little above the tail race |
| C. | Slightly below the tail race |
| D. | About 2.5 m above the tail race to avoid cavitations |
| Answer» C. Slightly below the tail race | |
| 562. |
_ The depth of the bucket for a Pelton wheel is generally _________ the diameter of jet.$? |
| A. | Equal to |
| B. | 1.2 times |
| C. | 1.8 times |
| D. | Double |
| Answer» C. 1.8 times | |
| 563. |
_ The pressure of the liquid flowing through the divergent portion of a Venturimeter$? |
| A. | Remains constant |
| B. | Increases |
| C. | Decreases |
| D. | Depends upon mass of liquid |
| Answer» D. Depends upon mass of liquid | |
| 564. |
_ The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as$? |
| A. | Path line |
| B. | Stream line |
| C. | Steak line |
| D. | Potential line |
| Answer» C. Steak line | |
| 565. |
_ A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be$? |
| A. | (2A‚à öH‚ÇÅ)/(Cd √ó a‚à ö2g) |
| B. | (2AH‚ÇÅ)/(Cd √ó a‚à ö2g) |
| C. | (2AH‚ÇÅ3/2)/(Cd √ó a‚à ö2g) |
| D. | (2AH‚ÇŬ≤)/(Cd √ó a‚à ö2g) |
| Answer» B. (2AH‚Äö√á√Ö)/(Cd ‚àö√≥ a‚Äö√ √∂2g) | |
| 566. |
_ According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C = Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed)$? |
| A. | A √ó ‚à ö(m √ó i) |
| B. | C √ó ‚à ö(m √ó i) |
| C. | AC √ó ‚à ö(m √ó i) |
| D. | mi √ó ‚à ö(A √ó C) |
| Answer» D. mi ‚àö√≥ ‚Äö√ √∂(A ‚àö√≥ C) | |
| 567. |
_ The property by virtue of which a liquid opposes relative motion between its different layers is called$? |
| A. | Surface tension |
| B. | Coefficient of viscosity |
| C. | Viscosity |
| D. | Osmosis |
| Answer» D. Osmosis | |
| 568. |
_ The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.$? |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | None of these |
| Answer» C. Equal to | |
| 569. |
_ The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately$? |
| A. | 5 mm |
| B. | 10 mm |
| C. | 20 mm |
| D. | 30 mm |
| Answer» E. | |
| 570. |
_ When a liquid is flowing through a pipe, the velocity of the liquid is$? |
| A. | Maximum at the centre and minimum near the walls |
| B. | Minimum at the centre and maximum near the walls |
| C. | Zero at the centre and maximum near the walls |
| D. | Maximum at the centre and zero near the walls |
| Answer» B. Minimum at the centre and maximum near the walls | |
| 571. |
_ When a body floating in a liquid, is displaced slightly, it oscillates about$? |
| A. | C.G. of body |
| B. | Center of pressure |
| C. | Center of buoyancy |
| D. | Metacentre |
| Answer» E. | |
| 572. |
__Centrifugal pump is started with its delivery valve__ |
| A. | Kept fully closed |
| B. | Kept fully open |
| C. | Irrespective of any position |
| D. | Kept 50% open |
| Answer» B. Kept fully open | |
| 573. |
__A fluid whose viscosity does not change with the rate of deformation or shear strain is known as__ |
| A. | Real fluid |
| B. | Ideal fluid |
| C. | Newtonian fluid |
| D. | Non-Newtonian fluid |
| Answer» D. Non-Newtonian fluid | |
| 574. |
__Medium specific speed of a pump implies it is__ |
| A. | Centrifugal pump |
| B. | Mixed flow pump |
| C. | Axial flow pump |
| D. | Any one of the above |
| Answer» C. Axial flow pump | |
| 575. |
__According to fan laws, at constant pressure, the speed capacity and power vary__ |
| A. | Directly as the air or gas density |
| B. | Inversely as square root of density |
| C. | Inversely as density |
| D. | As square of density |
| Answer» C. Inversely as density | |
| 576. |
__Hydrometer is used to determine__ |
| A. | Specific gravity of liquids |
| B. | Specific gravity of solids |
| C. | Specific gravity of gases |
| D. | Relative humidity |
| Answer» B. Specific gravity of solids | |
| 577. |
__A flow is called super-sonic if the__ |
| A. | Velocity of flow is very high |
| B. | Discharge is difficult to measure |
| C. | Mach number is between 1 and 6 |
| D. | None of these |
| Answer» D. None of these | |
| 578. |
__A pressure of 25 m of head of water is equal to__ |
| A. | 25 kN/ m² |
| B. | 245 kN/ m² |
| C. | 2500 kN/m² |
| D. | 2.5 kN/ m² |
| Answer» C. 2500 kN/m¬¨‚⧠| |
| 579. |
__When a body is placed over a liquid, it will sink down if__ |
| A. | Gravitational force is equal to the up-thrust of the liquid |
| B. | Gravitational force is less than the up-thrust of the liquid |
| C. | Gravitational force is more than the up-thrust of the liquid |
| D. | None of the above |
| Answer» D. None of the above | |
| 580. |
__The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is _______ of the jet velocity,__ |
| A. | One-fourth |
| B. | One-half |
| C. | Three-fourth |
| D. | Double |
| Answer» C. Three-fourth | |
| 581. |
__The coefficient of discharge for an external mouthpiece is__ |
| A. | 0.375 |
| B. | 0.5 |
| C. | 0.707 |
| D. | 0.855 |
| Answer» E. | |
| 582. |
_If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by$? |
| A. | H = Hg/hf |
| B. | H = Hg √ó hf |
| C. | H = Hg + hf |
| D. | H = Hg - hf |
| Answer» E. | |
| 583. |
_A channel is said to be of most economical cross-section, if$? |
| A. | It gives maximum discharge for a given cross-sectional area and bed slope |
| B. | It has minimum wetted perimeter |
| C. | It involves lesser excavation for the designed amount of discharge |
| D. | All of the above |
| Answer» E. | |
| 584. |
_An orifice is said to be large, if$? |
| A. | The size of orifice is large |
| B. | The velocity of flow is large |
| C. | The available head of liquid is more than 5 times the height of orifice |
| D. | The available head of liquid is less than 5 times the height of orifice |
| Answer» E. | |
| 585. |
_In a centrifugal pump, the liquid enters the pump$? |
| A. | At the top |
| B. | At the bottom |
| C. | At the canter |
| D. | From sides |
| Answer» D. From sides | |
| 586. |
_A flow whose streamline is represented by a straight line, is called __________ dimensional flow.$? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» B. Two | |
| 587. |
_An open vessel of water is accelerated up an inclined plane. The free water surface will$? |
| A. | Be horizontal |
| B. | Make an angle in direction of inclination of inclined plane |
| C. | Make an angle in opposite direction to inclination of inclined plane |
| D. | Any one of above is possible |
| Answer» D. Any one of above is possible | |
| 588. |
_For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called$? |
| A. | Continuity equation |
| B. | Bernoulli’s equation |
| C. | Pascal’s law |
| D. | Archimedes’s principle |
| Answer» C. Pascal‚Äö√Ñ√¥s law | |
| 589. |
_If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.$? |
| A. | Geometric similarity |
| B. | Kinematic similarity |
| C. | Dynamic similarity |
| D. | None of these |
| Answer» D. None of these | |
| 590. |
_A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is$? |
| A. | 14œÄ R1/2/15Cd √ó a ‚à ö(2g) |
| B. | 14œÄ R3/2/15Cd √ó a ‚à ö(2g) |
| C. | 14œÄ R5/2/15Cd √ó a ‚à ö(2g) |
| D. | 14œÄ R7/2/15Cd √ó a ‚à ö(2g) |
| Answer» D. 14≈ì√Ñ R7/2/15Cd ‚àö√≥ a ‚Äö√ √∂(2g) | |
| 591. |
_A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is$? |
| A. | 400 kg/cm² |
| B. | 4000 kg/cm² |
| C. | 40 × 10⁵ kg/cm² |
| D. | 40 × 10⁶ kg/cm² |
| Answer» C. 40 ‚àö√≥ 10‚Äö√Ö¬µ kg/cm¬¨‚⧠| |
| 592. |
_In order to avoid cavitation in centrifugal pumps$? |
| A. | The suction pressure should be high |
| B. | The delivery pressure should be high |
| C. | The suction pressure should be low |
| D. | The delivery pressure should be low |
| Answer» B. The delivery pressure should be high | |
| 593. |
_Buoyant force is$? |
| A. | The resultant force acting on a floating body |
| B. | The resultant force on a body due to the fluid surrounding it |
| C. | Equal to the volume of liquid displaced |
| D. | The force necessary to maintain equilibrium of a submerged body |
| Answer» C. Equal to the volume of liquid displaced | |
| 594. |
_For a floating body to be in equilibrium$? |
| A. | Meta centre should be above e.g. |
| B. | Centre of buoyancy and e.g. must lie on same vertical plane |
| C. | A righting couple should be formed |
| D. | All of the above |
| Answer» E. | |
| 595. |
_Viscosity of water in comparison to mercury is$? |
| A. | Higher |
| B. | Lower |
| C. | Same |
| D. | Higher/lower depending on temperature |
| Answer» B. Lower | |
| 596. |
_In a reciprocating pump, air vessels are used to$? |
| A. | Smoothen the flow |
| B. | Reduce suction head |
| C. | Increase delivery head |
| D. | Reduce acceleration head |
| Answer» E. | |
| 597. |
_A point, in a compressible flow where the velocity of fluid is zero, is called$? |
| A. | Critical point |
| B. | Vena contracta |
| C. | Stagnation point |
| D. | None of these |
| Answer» D. None of these | |
| 598. |
_The hydraulic efficiency of an impulse turbine is the$? |
| A. | Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine |
| B. | Ratio of the actual work available at the turbine to the energy imparted to the wheel |
| C. | Ratio of the work done on the wheel to the energy of the jet |
| D. | None of the above |
| Answer» D. None of the above | |
| 599. |
_In a centrifugal pump, the regulating valve is provided on the$? |
| A. | Casing |
| B. | Delivery pipe |
| C. | Suction pipe |
| D. | Impeller |
| Answer» C. Suction pipe | |
| 600. |
_A manometer is used to measure$? |
| A. | Atmospheric pressure |
| B. | Pressure in pipes and channels |
| C. | Pressure in Venturimeter |
| D. | Difference of pressures between two points in a pipe |
| Answer» C. Pressure in Venturimeter | |