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.
| 351. |
*$_The pressure less than atmospheric pressure is known as? |
| A. | Suction pressure |
| B. | Vacuum pressure |
| C. | Negative gauge pressure |
| D. | All of these |
| Answer» E. | |
| 352. |
*$_Dynamic viscosity of most of the liquids with rise in temperature? |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | Unpredictable |
| Answer» C. Remain unaffected | |
| 353. |
*$_A fluid which obeys the Newton's law of viscosity is termed as? |
| A. | Real fluid |
| B. | Ideal fluid |
| C. | Newtonian fluid |
| D. | Non-Newtonian fluid |
| Answer» D. Non-Newtonian fluid | |
| 354. |
*$_Differential manometer is used to measure? |
| A. | Pressure in pipes, channels etc. |
| B. | Atmospheric pressure |
| C. | Very low pressure |
| D. | Difference of pressure between two points |
| Answer» E. | |
| 355. |
*$_The ratio of the inertia force to the viscous force is called? |
| A. | Reynold's number |
| B. | Froude's number |
| C. | Weber's number |
| D. | Euler's number |
| Answer» B. Froude's number | |
| 356. |
*$_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 | |
| 357. |
*$_If no resistance is encountered by displacement, such a substance is known as? |
| A. | Fluid |
| B. | Water |
| C. | Gas |
| D. | Ideal fluid |
| Answer» E. | |
| 358. |
*$_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. | |
| 359. |
*$_Surface tension? |
| A. | Acts in the plane of the interface normal to any line in the surface |
| B. | Is also known as capillarity |
| C. | Is a function of the curvature of the interface |
| D. | Decreases with fall in temperature |
| Answer» B. Is also known as capillarity | |
| 360. |
*$_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¬¨‚⧠| |
| 361. |
*$_Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of? |
| A. | 39.2% |
| B. | 49.2% |
| C. | 68.8% |
| D. | 84.8% |
| Answer» E. | |
| 362. |
*$_Runaway speed of a hydraulic turbine is? |
| A. | Full load speed |
| B. | The speed at which turbine runner will be damaged |
| C. | The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open |
| D. | The speed corresponding to maximum overload permissible |
| Answer» D. The speed corresponding to maximum overload permissible | |
| 363. |
*$_The pressure at a point 4 m below the free surface of water is? |
| A. | 19.24 kPa |
| B. | 29.24 kPa |
| C. | 39.24 kPa |
| D. | 49.24 kPa |
| Answer» D. 49.24 kPa | |
| 364. |
*$_Choose the correct relationship? |
| A. | Specific gravity = gravity √ó density |
| B. | Dynamic viscosity = kinematic viscosity √ó density |
| C. | Gravity = specific gravity √ó density |
| D. | Kinematic viscosity = dynamic viscosity √ó density |
| Answer» C. Gravity = specific gravity ‚àö√≥ density | |
| 365. |
*$_The speed ratio in case of Francis turbine varies from? |
| A. | 0.15 to 0.3 |
| B. | 0.4 to 0.5 |
| C. | 0.6 to 0.9 |
| D. | 1 to 1.5 |
| Answer» D. 1 to 1.5 | |
| 366. |
*$_Multistage centrifugal pumps are used to obtain? |
| A. | High discharge |
| B. | High head |
| C. | Pumping of viscous fluids |
| D. | High head and high discharge |
| Answer» C. Pumping of viscous fluids | |
| 367. |
*$_The overall efficiency for a Pelton wheel lies between? |
| A. | 0.50 to 0.65 |
| B. | 0.65 to 0.75 |
| C. | 0.75 to 0.85 |
| D. | 0.85 to 0.90 |
| Answer» E. | |
| 368. |
*$_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 | |
| 369. |
*$_If the depth of water in an open channel is less than the critical depth, the flow is called? |
| A. | Critical flow |
| B. | Turbulent flow |
| C. | Tranquil flow |
| D. | Torrential flow |
| Answer» E. | |
| 370. |
*$_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 | |
| 371. |
*$_Metacentric height is the distance between the metacentre and? |
| A. | Water surface |
| B. | Center of pressure |
| C. | Center of gravity |
| D. | Center of buoyancy |
| Answer» D. Center of buoyancy | |
| 372. |
*$_For very great pressures, viscosity of moss gases and liquids? |
| A. | Remain same |
| B. | Increases |
| C. | Decreases |
| D. | Shows erratic behavior |
| Answer» E. | |
| 373. |
*$_A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is? |
| A. | 4.5 kN/m3 |
| B. | 6 kN/m3 |
| C. | 7.5 kN/m3 |
| D. | 10 kN/m3 |
| Answer» D. 10 kN/m3 | |
| 374. |
*$_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 | |
| 375. |
*$_Ratio of inertia force to elastic force is known as? |
| A. | Mach number |
| B. | Froude number |
| C. | Reynolds number |
| D. | Weber's number |
| Answer» B. Froude number | |
| 376. |
*$_The velocity corresponding to Reynold number of 2800, is called? |
| A. | Sub-sonic velocity |
| B. | Super-sonic velocity |
| C. | Lower critical velocity |
| D. | Higher critical velocity |
| Answer» E. | |
| 377. |
*$_The hydraulic mean depth for a circular pipe of diameter (d) is? |
| A. | d/6 |
| B. | d/4 |
| C. | d/2 |
| D. | d |
| Answer» C. d/2 | |
| 378. |
*$_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 | |
| 379. |
*/*_When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of? |
| A. | A triangle |
| B. | A paraboloid |
| C. | An ellipse |
| D. | None of these |
| Answer» C. An ellipse | |
| 380. |
*/*_When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid? |
| A. | Remains horizontal |
| B. | Becomes curved |
| C. | Falls on the front end |
| D. | Falls on the back end |
| Answer» D. Falls on the back end | |
| 381. |
*/*_A flow in which the viscosity of fluid is dominating over the inertia force is called? |
| A. | Steady flow |
| B. | Unsteady flow |
| C. | Laminar flow |
| D. | Turbulent flow |
| Answer» D. Turbulent flow | |
| 382. |
*/*_The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)? |
| A. | 1/RN |
| B. | 4/RN |
| C. | 16/RN |
| D. | 64/RN |
| Answer» D. 64/RN | |
| 383. |
*/*_If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, the body is said to be in __________ equilibrium.? |
| A. | Neutral |
| B. | Stable |
| C. | Unstable |
| D. | None of these |
| Answer» B. Stable | |
| 384. |
*/*_The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is? |
| A. | Directly proportional to (radius)2 |
| B. | Inversely proportional to (radius)2 |
| C. | Directly proportional to (radius)4 |
| D. | Inversely proportional to (radius)4 |
| Answer» D. Inversely proportional to (radius)4 | |
| 385. |
*/*_The highest efficiency is obtained with a channel of __________ section.? |
| A. | Circular |
| B. | Square |
| C. | Rectangular |
| D. | Trapezoidal |
| Answer» E. | |
| 386. |
*/*_The hydraulic efficiency of a reaction turbine, is the ratio of? |
| A. | Power produced by the turbine to the energy actually supplied by the turbine |
| B. | Actual work available at the turbine to energy imparted to the wheel |
| C. | Work-done on the wheel to the energy (or head of water) actually supplied to the turbine |
| D. | None of the above |
| Answer» D. None of the above | |
| 387. |
*/*_The jet ratio is defined as the ratio of the? |
| A. | Diameter of jet to the diameter of Pelton wheel |
| B. | Velocity of jet to the velocity of Pelton wheel |
| C. | Diameter of Pelton wheel to the diameter of jet |
| D. | Velocity of Pelton wheel to the velocity of jet |
| Answer» D. Velocity of Pelton wheel to the velocity of jet | |
| 388. |
*/*_The viscosity of water at 20°C is? |
| A. | One stoke |
| B. | One centistoke |
| C. | One poise |
| D. | One centipoise |
| Answer» E. | |
| 389. |
*/*_The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if? |
| A. | The area is horizontal |
| B. | The area is vertical |
| C. | The area is inclined |
| D. | All of the above |
| Answer» E. | |
| 390. |
*/*_The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by? |
| A. | [2(Vr - v) v]/ Vr² |
| B. | [2(Vr + v) v]/ Vr² |
| C. | [(Vr - v) v]/ Vr |
| D. | [(Vr + v) v]/ Vr |
| Answer» B. [2(Vr + v) v]/ Vr¬¨‚⧠| |
| 391. |
*/*_The density of water is 1000 kg/m3 at? |
| A. | 0° C |
| B. | 0° K |
| C. | 4° C |
| D. | 20° C |
| Answer» D. 20¬¨‚àû C | |
| 392. |
*/*_During the opening of a valve in a pipe line, the flow is? |
| A. | Steady |
| B. | Unsteady |
| C. | Uniform |
| D. | Laminar |
| Answer» C. Uniform | |
| 393. |
*/*_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 | |
| 394. |
*/*_A fluid in equilibrium can't sustain? |
| A. | Tensile stress |
| B. | Compressive stress |
| C. | Shear stress |
| D. | Bending stress |
| Answer» D. Bending stress | |
| 395. |
*/*_Kinematic viscosity is dependent upon? |
| A. | Pressure |
| B. | Distance |
| C. | Density |
| D. | Flow |
| Answer» D. Flow | |
| 396. |
*/*_A thick liquid like syrup has a __________ viscosity than a light liquid like water.? |
| A. | Lesser |
| B. | Greater |
| C. | Same |
| D. | None of these |
| Answer» C. Same | |
| 397. |
*/*_In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by? |
| A. | Designing new impeller |
| B. | Trimming the impeller size to the required size by machining |
| C. | Not possible |
| D. | Some other alterations in the impeller |
| Answer» C. Not possible | |
| 398. |
*/*_Froude number is significant in? |
| A. | Supersonics, as with projectile and jet propulsion |
| B. | Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. |
| C. | Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls |
| D. | All of the above |
| Answer» D. All of the above | |
| 399. |
*/*_In a free nappe,? |
| A. | The pressure below the nappe is atmospheric |
| B. | The pressure below the nappe is negative |
| C. | The pressure above the nappe is atmospheric |
| D. | The pressure above the nappe is negative |
| Answer» B. The pressure below the nappe is negative | |
| 400. |
*/*_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 | |