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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.
| 451. |
The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet) |
| A. | (1 + cos φ)/2 |
| B. | (1 - cos φ)/2 |
| C. | (1 + sin φ)/2 |
| D. | (1 - sin φ)/2 |
| Answer» B. (1 - cos φ)/2 | |
| 452. |
Which of the following meters is not associated with viscosity? |
| A. | Red wood |
| B. | Say bolt |
| C. | Engler |
| D. | Orsat |
| Answer» E. | |
| 453. |
A flow in which __________ force is dominating over the viscosity is called turbulent flow. |
| A. | Elastic |
| B. | Surface tension |
| C. | Viscous |
| D. | Inertia |
| Answer» E. | |
| 454. |
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. | |
| 455. |
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 speed of the wheel is |
| A. | 10 r.p.m. |
| B. | 20 r.p.m. |
| C. | 40 r.p.m. |
| D. | 80 r.p.m. |
| Answer» C. 40 r.p.m. | |
| 456. |
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is |
| A. | Slow speed pump with radial flow at outlet |
| B. | Medium speed pump with radial flow at outlet |
| C. | High speed pump with radial flow at outlet |
| D. | High speed pump with axial flow at outlet |
| Answer» B. Medium speed pump with radial flow at outlet | |
| 457. |
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 | |
| 458. |
The ratio of the inertia force to the __________ is called Euler's number. |
| A. | Pressure force |
| B. | Elastic force |
| C. | Surface tension force |
| D. | Viscous force |
| Answer» B. Elastic force | |
| 459. |
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 | |
| 460. |
For measuring flow by a Venturimeter, if should be installed in |
| A. | Vertical line |
| B. | Horizontal line |
| C. | Inclined line with flow downward |
| D. | In any direction and in any location |
| Answer» E. | |
| 461. |
A flow whose streamline is represented by a curve, is called |
| A. | One-dimensional flow |
| B. | Two-dimensional flow |
| C. | Three-dimensional flow |
| D. | Four-dimensional flow |
| Answer» C. Three-dimensional flow | |
| 462. |
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. | |
| 463. |
Normal depth in open channel flow is the depth of flow corresponding to |
| A. | Steady flow |
| B. | Unsteady flow |
| C. | Laminar flow |
| D. | Uniform flow |
| Answer» E. | |
| 464. |
The length of the divergent cone in a Venturimeter is __________ that of the convergent cone. |
| A. | Equal to |
| B. | Double |
| C. | Three to four times |
| D. | Five to six times |
| Answer» D. Five to six times | |
| 465. |
Puck up the wrong statement about centrifugal pump |
| A. | Discharge a diameter |
| B. | Head a speed² |
| C. | Head a diameter |
| D. | Power a speed⁴ |
| Answer» B. Head a speed² | |
| 466. |
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 | |
| 467. |
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 × hf |
| C. | H = Hg + hf |
| D. | H = Hg - hf |
| Answer» E. | |
| 468. |
The flow which neglects changes in a transverse direction is known as |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» B. Uniform flow | |
| 469. |
The power transmitted through the pipe is maximum when the head lost due to friction is equal to |
| A. | One-fourth of the total supply head |
| B. | One-third of the total supply head |
| C. | One-half of the total supply head |
| D. | Two-third of the total supply head |
| Answer» C. One-half of the total supply head | |
| 470. |
The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream |
| A. | Keeps on increasing |
| B. | Keeps on decreasing |
| C. | Remain constant |
| D. | May increase/decrease |
| Answer» D. May increase/decrease | |
| 471. |
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 × 10⁵ kg/cm² | |
| 472. |
The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach) |
| A. | (2/3) Cd × L.√2g [H1 - Ha] |
| B. | (2/3) Cd × L. √2g [H13/2 - Ha3/2] |
| C. | (2/3) Cd × L.√2g [H12 - Ha2] |
| D. | (2/3) Cd × L. √2g [H15/2 - Ha5/2] |
| Answer» C. (2/3) Cd × L.√2g [H12 - Ha2] | |
| 473. |
The discharge 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» E. | |
| 474. |
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. | |
| 475. |
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is |
| A. | 1.84(L - 0.1nH)H3/2 |
| B. | 1.84(L - nH)H2 |
| C. | 1.84(L - 0.1nH)H5/2 |
| D. | 1.84(L - nH)H3 |
| Answer» B. 1.84(L - nH)H2 | |
| 476. |
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. | |
| 477. |
The discharge in an open channel corresponding to critical depth is |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | None of these |
| Answer» D. None of these | |
| 478. |
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 | |
| 479. |
The Francis formula for the discharge over Cipoletti weir is |
| A. | 1.84 LH1/2 |
| B. | 1.84 LH |
| C. | 1.84 LH3/2 |
| D. | 1.84 LH5/2 |
| Answer» D. 1.84 LH5/2 | |
| 480. |
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 | |
| 481. |
The gross or total head of the turbine is the ___________ of the water levels at the head race and tail race. |
| A. | Sum |
| B. | Difference |
| C. | Product |
| D. | None of these |
| Answer» C. Product | |
| 482. |
Specific weight of sea water is more that of pure water because it contains |
| A. | Dissolved air |
| B. | Dissolved salt |
| C. | Suspended matter |
| D. | All of the above |
| Answer» E. | |
| 483. |
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 | |
| 484. |
The ratio of the inertia force to the elastic force is called |
| A. | Reynold's number |
| B. | Froude's number |
| C. | Weber's number |
| D. | Mach number |
| Answer» E. | |
| 485. |
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 | |
| 486. |
Resultant pressure of the liquid in the case of an immersed body acts through |
| A. | Centre of gravity |
| B. | Centre of pressure |
| C. | Metacentre |
| D. | Centre of buoyancy |
| Answer» C. Metacentre | |
| 487. |
Specific speed for reaction turbines ranges from |
| A. | 0 to 4.5 |
| B. | 10 to 100 |
| C. | 80 to 200 |
| D. | 250 to 300 |
| Answer» C. 80 to 200 | |
| 488. |
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. | |
| 489. |
The specific speed of a hydraulic turbine depends upon |
| A. | Speed and power developed |
| B. | Discharge and power developed |
| C. | Speed and head of water |
| D. | Speed, power developed and head of water |
| Answer» E. | |
| 490. |
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. | |
| 491. |
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if |
| A. | Length of both the pipes is same |
| B. | Diameter of both the pipes is same |
| C. | Loss of head and discharge of both the pipes is same |
| D. | Loss of head and velocity of flow in both the pipes is same |
| Answer» D. Loss of head and velocity of flow in both the pipes is same | |
| 492. |
Mercury is often used in barometer because |
| A. | It is the best liquid |
| B. | The height of barometer will be less |
| C. | Its vapour pressure is so low that it may be neglected |
| D. | Both (B) and (C) |
| Answer» E. | |
| 493. |
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 | |
| 494. |
Newton's law of viscosity is a relationship between |
| A. | Pressure, velocity and temperature |
| B. | Shear stress and rate of shear strain |
| C. | Shear stress and velocity |
| D. | Rate of shear strain and temperature |
| Answer» C. Shear stress and velocity | |
| 495. |
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 | |
| 496. |
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 | |
| 497. |
The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called |
| A. | Newton's law of motion |
| B. | Newton's law of cooling |
| C. | Newton's law of viscosity |
| D. | Newton's law of resistance |
| Answer» E. | |
| 498. |
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’s law | |
| 499. |
When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called |
| A. | Pascal’s law |
| B. | Archimedes’s principle |
| C. | Principle of flotation |
| D. | Bernoulli’s theorem |
| Answer» C. Principle of flotation | |
| 500. |
The specific weight of sea water is __________ that of pure water. |
| A. | Same as |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |