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.
| 301. |
The optimum value of vane exit angle for a centrifugal pump impeller is%! |
| A. | 10-15° |
| B. | 20-25° |
| C. | 30-40° |
| D. | 50-60° |
| Answer» C. 30-40¬¨‚àû | |
| 302. |
The tangential velocity of the water element having a free vortex is%! |
| A. | Directly proportional to its distance from the centre |
| B. | Inversely proportional to its distance from the centre |
| C. | Directly proportional to its (distance)2 from the centre |
| D. | Inversely proportional to its (distance)2 from the centre |
| Answer» C. Directly proportional to its (distance)2 from the centre | |
| 303. |
The divergent portion of a Venturimeter is made longer than convergent portion in order to%! |
| A. | Avoid the tendency of breaking away the stream of liquid |
| B. | To minimize frictional losses |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 304. |
The total head of a liquid particle in motion is equal to%! |
| A. | Pressure head + kinetic head + potential head |
| B. | Pressure head - (kinetic head + potential head) |
| C. | Potential head - (pressure head + kinetic head) |
| D. | Kinetic head - (pressure head + potential head) |
| Answer» B. Pressure head - (kinetic head + potential head) | |
| 305. |
An ideal flow of any fluid must satisfy%! |
| A. | Pascal law |
| B. | Newton's law of viscosity |
| C. | Boundary layer theory |
| D. | Continuity equation |
| Answer» E. | |
| 306. |
If the surface of liquid is convex, men%! |
| A. | Cohesion pressure is negligible |
| B. | Cohesion pressure is decreased |
| C. | Cohesion pressure is increased |
| D. | There is no cohesion pressure |
| Answer» D. There is no cohesion pressure | |
| 307. |
Working principle of dead weight pressure gauge tester is based on%! |
| A. | Pascal's law |
| B. | Dalton's law of partial pressure |
| C. | Newton's law of viscosity |
| D. | Avogadro's hypothesis |
| Answer» B. Dalton's law of partial pressure | |
| 308. |
A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is%! |
| A. | 2.89 kN |
| B. | 8.29 kN |
| C. | 9.28 kN |
| D. | 28.9 kN |
| Answer» C. 9.28 kN | |
| 309. |
The specific weight of water is 1000 kg/m3%! |
| A. | At normal pressure of 760 mm |
| B. | At 4°C temperature |
| C. | At mean sea level |
| D. | All the above |
| Answer» E. | |
| 310. |
If no resistance is encountered by displacement, such a substance is known as%! |
| A. | Fluid |
| B. | Water |
| C. | Gas |
| D. | Ideal fluid |
| Answer» E. | |
| 311. |
The unit of viscosity is%! |
| A. | Meters² per sec |
| B. | kg-sec/meter |
| C. | Newton-sec per meter² |
| D. | Newton-sec per meter |
| Answer» C. Newton-sec per meter¬¨‚⧠| |
| 312. |
Surface tension%! |
| A. | Acts in the plane of the interface normal to any line in the surface |
| B. | Is also known as capillarity |
| C. | Is a function of the curvature of the interface |
| D. | Decreases with fall in temperature |
| Answer» B. Is also known as capillarity | |
| 313. |
A fluid in equilibrium can't sustain%! |
| A. | Tensile stress |
| B. | Compressive stress |
| C. | Shear stress |
| D. | Bending stress |
| Answer» D. Bending stress | |
| 314. |
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be%! |
| A. | 2 metres of water column |
| B. | 3 metres of water column |
| C. | 3.5 metres of water column |
| D. | 4 m of water column |
| Answer» C. 3.5 metres of water column | |
| 315. |
A weir, generally, used as a spillway of a dam is%! |
| A. | Narrow crested weir |
| B. | Broad crested weir |
| C. | Ogee weir |
| D. | Submerged weir |
| Answer» D. Submerged weir | |
| 316. |
During the opening of a valve in a pipe line, the flow is%! |
| A. | Steady |
| B. | Unsteady |
| C. | Uniform |
| D. | Laminar |
| Answer» C. Uniform | |
| 317. |
The total pressure on an immersed surface inclined at an angle θ with the liquid surface is%! |
| A. | wA |
| B. | wx |
| C. | wAx |
| D. | wAx/sinθ |
| Answer» D. wAx/sin≈í‚àè | |
| 318. |
The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to%! |
| A. | Half the depth |
| B. | Half the breadth |
| C. | Twice the depth |
| D. | Twice the breadth |
| Answer» B. Half the breadth | |
| 319. |
The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.%! |
| A. | 0.34 times |
| B. | 0.67 times |
| C. | 0.81 times |
| D. | 0.95 times |
| Answer» D. 0.95 times | |
| 320. |
Select the correct statement%! |
| A. | Weber's number is the ratio of inertia force to elastic force |
| B. | Weber's number is the ratio of gravity force to surface tension force |
| C. | Weber's number is the ratio of viscous force to pressure force |
| D. | Weber's number is the ratio of inertia force to surface tension force |
| Answer» E. | |
| 321. |
The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of 15 meters at 725 r.p.m., is%! |
| A. | 24.8 r.p.m. |
| B. | 48.2 r.p.m |
| C. | 82.4 r.p.m. |
| D. | 248 r.p.m |
| Answer» D. 248 r.p.m | |
| 322. |
A moving fluid mass may be brought to a static equilibrium position, by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called%! |
| A. | Pascal’s law |
| B. | Archimedes’s principle |
| C. | D-Alembert’s principle |
| D. | None of these |
| Answer» D. None of these | |
| 323. |
The rise of liquid along the walls of a revolving cylinder about the initial level is _________ the depression of the liquid at the axis of rotation.%! |
| A. | Same as |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» B. Less than | |
| 324. |
The runaway speed of a hydraulic turbine is the speed%! |
| A. | At full load |
| B. | At which there will be no damage to the runner |
| C. | Corresponding to maximum overload permissible |
| D. | At which the turbine will run freely without load |
| Answer» E. | |
| 325. |
Alcohol is used in manometers because%! |
| A. | It has low vapour pressure |
| B. | It is clearly visible |
| C. | It has low surface tension |
| D. | It can provide longer column due to low density |
| Answer» E. | |
| 326. |
A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit discharge of wheel is%! |
| A. | 0.25 m3/s |
| B. | 0.5 m3/s |
| C. | 1.5 m3/s |
| D. | 2.5 m3/s |
| Answer» B. 0.5 m3/s | |
| 327. |
A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is%! |
| A. | 4.5 kN/m3 |
| B. | 6 kN/m3 |
| C. | 7.5 kN/m3 |
| D. | 10 kN/m3 |
| Answer» D. 10 kN/m3 | |
| 328. |
For very great pressures, viscosity of moss gases and liquids%! |
| A. | Remain same |
| B. | Increases |
| C. | Decreases |
| D. | Shows erratic behavior |
| Answer» E. | |
| 329. |
The maximum efficiency of transmission through a pipe is%! |
| A. | 50 % |
| B. | 56.7 % |
| C. | 66.67 % |
| D. | 76.66 % |
| Answer» D. 76.66 % | |
| 330. |
Ratio of inertia force to elastic force is known as%! |
| A. | Mach number |
| B. | Froude number |
| C. | Reynolds number |
| D. | Weber's number |
| Answer» B. Froude number | |
| 331. |
The top of the weir over which the water flows is known as%! |
| A. | Sill or crest |
| B. | Nappe or vein |
| C. | Orifice |
| D. | None of these |
| Answer» B. Nappe or vein | |
| 332. |
In open channels, the specific energy is the%! |
| A. | Total energy per unit discharge |
| B. | Total energy measured with respect to the datum passing through the bottom of the channel |
| C. | Total energy measured above the horizontal datum |
| D. | Kinetic energy plotted above the free surface of water |
| Answer» C. Total energy measured above the horizontal datum | |
| 333. |
The hydraulic mean depth for a circular pipe of diameter (d) is%! |
| A. | d/6 |
| B. | d/4 |
| C. | d/2 |
| D. | d |
| Answer» C. d/2 | |
| 334. |
A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is%! |
| A. | 3.53 kN |
| B. | 33.3 kN |
| C. | 35.3 kN |
| D. | None of these |
| Answer» D. None of these | |
| 335. |
If the depth of water in an open channel is less than the critical depth, the flow is called%! |
| A. | Critical flow |
| B. | Turbulent flow |
| C. | Tranquil flow |
| D. | Torrential flow |
| Answer» E. | |
| 336. |
The power produced by the reaction turbine is ________ to the head of water.%! |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | 4th power |
| D. | None of these |
| Answer» B. Inversely proportional | |
| 337. |
Metacentric height is the distance between the metacentre and%! |
| A. | Water surface |
| B. | Center of pressure |
| C. | Center of gravity |
| D. | Center of buoyancy |
| Answer» D. Center of buoyancy | |
| 338. |
The overall efficiency for a Pelton wheel lies between%! |
| A. | 0.50 to 0.65 |
| B. | 0.65 to 0.75 |
| C. | 0.75 to 0.85 |
| D. | 0.85 to 0.90 |
| Answer» E. | |
| 339. |
*$_Coefficient of velocity is defined as the ratio of? |
| A. | Actual velocity of jet at vena contracta to the theoretical velocity |
| B. | Area of jet at vena contracta to the area of orifice |
| C. | Actual discharge through an orifice to the theoretical discharge |
| D. | None of the above |
| Answer» B. Area of jet at vena contracta to the area of orifice | |
| 340. |
*$_The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is? |
| A. | v₁²/2g |
| B. | v₂²/2g |
| C. | 0.5 v₁²/2g |
| D. | 0.375 v₂²/2g |
| Answer» E. | |
| 341. |
*$_Which of the following meters is not associated with viscosity?? |
| A. | Red wood |
| B. | Say bolt |
| C. | Engler |
| D. | Orsat |
| Answer» E. | |
| 342. |
*$_Bulk modulus of a fluid is the ratio of? |
| A. | Shear stress to shear strain |
| B. | Increase in volume to the viscosity of fluid |
| C. | Increase in pressure to the volumetric strain |
| D. | Critical velocity to the viscosity of fluid |
| Answer» D. Critical velocity to the viscosity of fluid | |
| 343. |
*$_Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the? |
| A. | Force of adhesion |
| B. | Force of cohesion |
| C. | Force of friction |
| D. | Force of diffusion |
| Answer» C. Force of friction | |
| 344. |
*$_The rise of liquid along the walls of a revolving cylinder about the initial level is _________ the depression of the liquid at the axis of rotation.? |
| A. | Same as |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» B. Less than | |
| 345. |
*$_A moving fluid mass may be brought to a static equilibrium position, by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called? |
| A. | Pascal’s law |
| B. | Archimedes’s principle |
| C. | D-Alembert’s principle |
| D. | None of these |
| Answer» D. None of these | |
| 346. |
*$_The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of 15 meters at 725 r.p.m., is? |
| A. | 24.8 r.p.m. |
| B. | 48.2 r.p.m |
| C. | 82.4 r.p.m. |
| D. | 248 r.p.m |
| Answer» D. 248 r.p.m | |
| 347. |
*$_Alcohol is used in manometers because? |
| A. | It has low vapour pressure |
| B. | It is clearly visible |
| C. | It has low surface tension |
| D. | It can provide longer column due to low density |
| Answer» E. | |
| 348. |
*$_The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to? |
| A. | Half the depth |
| B. | Half the breadth |
| C. | Twice the depth |
| D. | Twice the breadth |
| Answer» B. Half the breadth | |
| 349. |
*$_The runaway speed of a hydraulic turbine is the speed? |
| A. | At full load |
| B. | At which there will be no damage to the runner |
| C. | Corresponding to maximum overload permissible |
| D. | At which the turbine will run freely without load |
| Answer» E. | |
| 350. |
*$_Gauge pressure at a point is equal to the absolute pressure __________ the atmospheric pressure.? |
| A. | Plus |
| B. | Minus |
| C. | Divide |
| D. | Multiply |
| Answer» C. Divide | |