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MCQOPTIONS
This section includes 832 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
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 | |
| 352. |
A structure, whose width is __________ the width of the channel, is called a flumed structure. |
| A. | Less than |
| B. | More than |
| C. | Equal |
| D. | None of these |
| Answer» B. More than | |
| 353. |
In the case of steady flow of a fluid, the acceleration of any fluid particle is |
| A. | Constant |
| B. | Variable |
| C. | Zero |
| D. | Zero under limiting conditions |
| Answer» D. Zero under limiting conditions | |
| 354. |
Two dimensional flows occurs when |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | The magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| Answer» E. | |
| 355. |
The upper surface of a weir over which water flows is known is |
| A. | Crest |
| B. | Nappy |
| C. | Sill |
| D. | Weir top |
| Answer» D. Weir top | |
| 356. |
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 | |
| 357. |
A one dimensional flow is one which |
| A. | Is uniform flow |
| B. | Is steady uniform flow |
| C. | Takes place in straight lines |
| D. | Involves zero transverse component of flow |
| Answer» E. | |
| 358. |
The conditions for the stable equilibrium of a floating body are |
| A. | The metacentre should lie above the center of gravity |
| B. | The center of buoyancy and the center of gravity must lie on the same vertical line |
| C. | A righting couple should be formed |
| D. | All the above are correct |
| Answer» E. | |
| 359. |
The two important forces for a floating body are |
| A. | Buoyancy, gravity |
| B. | Buoyancy, pressure |
| C. | Buoyancy, inertial |
| D. | Inertial, gravity |
| Answer» B. Buoyancy, pressure | |
| 360. |
A streamline is defined as the line |
| A. | Parallel to central axis flow |
| B. | Parallel to outer surface of pipe |
| C. | Of equal velocity in a flow |
| D. | Along which the pressure drop is uniform |
| Answer» D. Along which the pressure drop is uniform | |
| 361. |
The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is |
| A. | ηh = ηo × ηm |
| B. | ηm = ηm × ηh |
| C. | ηo = ηh × ηm |
| D. | None of these |
| Answer» D. None of these | |
| 362. |
With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will |
| A. | Decrease |
| B. | Increase |
| C. | Remain unchanged |
| D. | Depend upon the characteristics of liquid |
| Answer» B. Increase | |
| 363. |
Mercury does not wet glass. This is due to property of liquid known as |
| A. | Adhesion |
| B. | Cohesion |
| C. | Surface tension |
| D. | Viscosity |
| Answer» D. Viscosity | |
| 364. |
Metacentre is the point of intersection of |
| A. | Vertical upward force through e.g. of body and center line of body |
| B. | Buoyant force and the center line of body |
| C. | Midpoint between e.g. and center of buoyancy |
| D. | All of the above |
| Answer» C. Midpoint between e.g. and center of buoyancy | |
| 365. |
True one-dimensional flow occurs when |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | The magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| Answer» B. The velocity of successive fluid particles, at any point, is the same at successive periods of time | |
| 366. |
Steady flow occurs when |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | The magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| Answer» C. The magnitude and direction of the velocity do not change from point to point in the fluid | |
| 367. |
Non uniform flow occurs when |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | Velocity, depth, pressure, etc. change from point to point in the fluid flow |
| D. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| Answer» D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane | |
| 368. |
When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as |
| A. | Steady flow |
| B. | Turbulent flow |
| C. | Vortex flow |
| D. | Uniform flow |
| Answer» D. Uniform flow | |
| 369. |
Meta-centric height is given as the distance between |
| A. | The center of gravity of the body and the metacenter |
| B. | The center of gravity of the body and the center of buoyancy |
| C. | The center of gravity of the body and the center of pressure |
| D. | Center of buoyancy and metacenter |
| Answer» B. The center of gravity of the body and the center of buoyancy | |
| 370. |
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 | |
| 371. |
Bernoulli equation deals with the law of conservation of |
| A. | Mass |
| B. | Momentum |
| C. | Energy |
| D. | Work |
| Answer» D. Work | |
| 372. |
Center of buoyancy is the |
| A. | Centroid of the displaced volume of fluid |
| B. | Center of pressure of displaced volume |
| C. | Does not exist |
| D. | None of the above |
| Answer» B. Center of pressure of displaced volume | |
| 373. |
The purpose of a surge tank is |
| A. | To control the pressure variations due to rapid changes in the pipe line flow |
| B. | To eliminate water hammer possibilities |
| C. | To regulate flow of water to turbines by providing necessary retarding head of water |
| D. | All of the above |
| Answer» E. | |
| 374. |
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is |
| A. | (V1 - V2) / V1 |
| B. | (V1² - V2²) / V1² |
| C. | V1 / (V1 - V2) |
| D. | V1² / (V1² - V2²) |
| Answer» C. V1 / (V1 - V2) | |
| 375. |
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. | |
| 376. |
For pipes, turbulent flow occurs when Reynolds number is |
| A. | Less than 2000 |
| B. | Between 2000 and 4000 |
| C. | More than 4000 |
| D. | Less than 4000 |
| Answer» D. Less than 4000 | |
| 377. |
For pipes, laminar flow occurs when Reynolds number is |
| A. | Less than 2000 |
| B. | Between 2000 and 4000 |
| C. | More than 4000 |
| D. | Less than 4000 |
| Answer» B. Between 2000 and 4000 | |
| 378. |
The stress-strain relation of the Newtonian fluid is |
| A. | Linear |
| B. | Parabolic |
| C. | Hyperbolic |
| D. | Inverse type |
| Answer» B. Parabolic | |
| 379. |
The liquid used in manometers should have |
| A. | Low density |
| B. | High density |
| C. | Low surface tension |
| D. | High surface tension |
| Answer» E. | |
| 380. |
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 | |
| 381. |
When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called |
| A. | Gauge pressure |
| B. | Absolute pressure |
| C. | Positive gauge pressure |
| D. | Vacuum pressure |
| Answer» D. Vacuum pressure | |
| 382. |
The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 383. |
Bulk modulus of a fluid __________ as the pressure increases. |
| A. | Remain same |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» D. None of these | |
| 384. |
The volume of a fluid __________ as the pressure increases. |
| A. | Remains same |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» C. Increases | |
| 385. |
To avoid an interruption in the flow of a siphon, an air vessel is provided |
| A. | At the inlet |
| B. | At the outlet |
| C. | At the summit |
| D. | At any point between inlet and outlet |
| Answer» D. At any point between inlet and outlet | |
| 386. |
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be |
| A. | Double |
| B. | Four times |
| C. | Eight times |
| D. | Sixteen times |
| Answer» E. | |
| 387. |
In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be |
| A. | Double |
| B. | Four times |
| C. | Eight times |
| D. | Sixteen times |
| Answer» B. Four times | |
| 388. |
The coefficient of discharge in case of internal mouthpiece is __________ that of external mouthpiece. |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | None of these |
| Answer» B. More than | |
| 389. |
Surface energy per unit area of a surface is numerically equal to |
| A. | Atmospheric pressure |
| B. | Surface tension |
| C. | Force of adhesion |
| D. | Force of cohesion |
| Answer» C. Force of adhesion | |
| 390. |
Rain drops are spherical because of |
| A. | Viscosity |
| B. | Air resistance |
| C. | Surface tension forces |
| D. | Atmospheric pressure |
| Answer» D. Atmospheric pressure | |
| 391. |
In an isothermal atmosphere, the pressure |
| A. | Decreases linearly with elevation |
| B. | Remain constant |
| C. | Varies in the same way as the density |
| D. | Increases exponentially with elevation |
| Answer» D. Increases exponentially with elevation | |
| 392. |
According to Bazin's formula, the discharge over a rectangular weir is mL2g x H3/2 where m is equal to |
| A. | 0.405 + (0.003/H) |
| B. | 0.003 + (0.405/H) |
| C. | 0.405 + (H/0.003) |
| D. | 0.003 + (H/0.405) |
| Answer» B. 0.003 + (0.405/H) | |
| 393. |
The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called |
| A. | Density of liquid |
| B. | Specific gravity of liquid |
| C. | Compressibility of liquid |
| D. | Surface tension of liquid |
| Answer» C. Compressibility of liquid | |
| 394. |
The centre of pressure for a vertically immersed surface lies at a distance equal to __________ the centre of gravity. |
| A. | IG / Ax̅ below |
| B. | IG / Ax̅ above |
| C. | Ax̅ / IG below |
| D. | Ax̅ / IG above |
| Answer» B. IG / Ax̅ above | |
| 395. |
The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which |
| A. | Delivers unit discharge under unit head |
| B. | Delivers unit discharge under unit speed |
| C. | Develops unit power under unit head |
| D. | Develops unit power under unit speed |
| Answer» D. Develops unit power under unit speed | |
| 396. |
In centrifugal pumps, maximum efficiency is obtained when the blades are |
| A. | Straight |
| B. | Bent forward |
| C. | Bent backward |
| D. | Radial |
| Answer» D. Radial | |
| 397. |
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is |
| A. | (v₁ - v₂)²/g |
| B. | (v₁² - v₂²)/g |
| C. | (v₁ - v₂)²/2g |
| D. | (v₁² - v₂²)/2g |
| Answer» D. (v₁² - v₂²)/2g | |
| 398. |
The depth of center of pressure of an immersed surface, inclined at an angle 'θ' with the liquid surface lies at a distance equal to __________ the center of gravity. |
| A. | IG sin²θ/Ax̅ below |
| B. | IG sin²θ/Ax̅ above |
| C. | IG sinθ/Ax̅ below |
| D. | IG sinθ/Ax̅ above |
| Answer» B. IG sin²θ/Ax̅ above | |
| 399. |
The length of a liquid stream while flowing over a weir __________ at the ends of the sill. |
| A. | Expands |
| B. | Does not change |
| C. | Contracts |
| D. | None of these |
| Answer» D. None of these | |
| 400. |
According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions) |
| A. | (2/3) × Cd (L - nH) × √(2gh) |
| B. | (2/3) × Cd (L - 0.1nH) × √(2g) × H3/2 |
| C. | (2/3) × Cd (L - nH) × √(2g) × H² |
| D. | (2/3) × Cd (L - nH) × √(2g) × H5/2 |
| Answer» C. (2/3) × Cd (L - nH) × √(2g) × H² | |