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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.
| 551. |
The intensity of pressure at any point, in a liquid, is |
| A. | Directly proportional to the area of the vessel containing liquid |
| B. | Directly proportional to the depth of liquid from the surface |
| C. | Directly proportional to the length of the vessel containing liquid |
| D. | Inversely proportional to the depth of liquid from the surface |
| Answer» C. Directly proportional to the length of the vessel containing liquid | |
| 552. |
Geometric similarity is said to exist between the model and the prototype, if both of them |
| A. | Have identical velocities |
| B. | Are equal in size and shape |
| C. | Are identical in shape, but differ only in size |
| D. | Have identical forces |
| Answer» D. Have identical forces | |
| 553. |
Dynamic similarity is said to exist between the model and the prototype, if both of them |
| A. | Have identical velocities |
| B. | Are equal in size and shape |
| C. | Are identical in shape, but differ only in size |
| D. | None of the above |
| Answer» E. | |
| 554. |
Kinematic similarity is said to exist between the model and the prototype, if both of them |
| A. | Have identical velocities |
| B. | Are equal in size and shape |
| C. | Are identical in shape, but differ only in size |
| D. | Have identical forces |
| Answer» B. Are equal in size and shape | |
| 555. |
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 | |
| 556. |
The pressure in Pascal’s at a depth of 1 m below the free surface of a body of water will be equal to |
| A. | 1 Pa |
| B. | 91 Pa |
| C. | 981 Pa |
| D. | 9810 Pa |
| Answer» E. | |
| 557. |
When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as |
| A. | Narrow-crested weir |
| B. | Broad-crested weir |
| C. | Ogee weir |
| D. | Submerged weir |
| Answer» E. | |
| 558. |
The sheet of water flowing over a notch or a weir is known as |
| A. | Sill or crest |
| B. | Nappe or vein |
| C. | Orifice |
| D. | None of these |
| Answer» C. Orifice | |
| 559. |
A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is |
| A. | (bd²/12) + x̅ |
| B. | (d²/12 x̅) + x̅ |
| C. | b²/12 + x̅ |
| D. | d²/12 + x̅ |
| Answer» C. b²/12 + x̅ | |
| 560. |
If the ratios of all the corresponding linear dimensions 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» B. Kinematic similarity | |
| 561. |
Fluid is a substance that |
| A. | Cannot be subjected to shear forces |
| B. | Always expands until it fills any container |
| C. | Has the same shear stress at a point regardless of its motion |
| D. | Cannot remain at rest under action of any shear force |
| Answer» E. | |
| 562. |
When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as |
| A. | Centre of pressure |
| B. | Centre of gravity |
| C. | Centre of buoyancy |
| D. | Metacentre |
| Answer» E. | |
| 563. |
The difference of pressure between the inside and outside of a liquid drop is |
| A. | p = T × r |
| B. | p = T/r |
| C. | p = T/2r |
| D. | p = 2T/r |
| Answer» E. | |
| 564. |
The viscosity of water at 20°C is |
| A. | One stoke |
| B. | One centistoke |
| C. | One poise |
| D. | One centipoise |
| Answer» E. | |
| 565. |
Which of the following statement is correct as regard to water wheels? |
| A. | They have slow speeds |
| B. | They are suitable even for low water heads |
| C. | They give constant efficiency, even if the discharge is not constant |
| D. | All of the above |
| Answer» E. | |
| 566. |
Which of the following pump is successfully used for lifting water to the turbines? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Jet pump |
| D. | Air lift pump |
| Answer» D. Air lift pump | |
| 567. |
The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is |
| A. | Slow speed with radial flow at outlet |
| B. | Medium speed with radial flow at outlet |
| C. | High speed with radial flow at outlet |
| D. | High speed with mixed flow at outlet |
| Answer» E. | |
| 568. |
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 | |
| 569. |
The flow ratio of Francis turbine is defined as the ratio of the |
| A. | Velocity of flow at inlet to the theoretical jet velocity |
| B. | Theoretical velocity of jet to the velocity of flow at inlet |
| C. | Velocity of runner at inlet to the velocity of flow at inlet |
| D. | None of the above |
| Answer» B. Theoretical velocity of jet to the velocity of flow at inlet | |
| 570. |
Operation of McLeod gauge used for low pressure measurement is based on the principle of |
| A. | Gas law |
| B. | Boyle's law |
| C. | Charles law |
| D. | Pascal's law |
| Answer» C. Charles law | |
| 571. |
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity |
| A. | One-half |
| B. | One-third |
| C. | Two-third |
| D. | Three-fourth |
| Answer» C. Two-third | |
| 572. |
In a centrifugal pump casing, the flow of water leaving the impeller, is |
| A. | Rectilinear flow |
| B. | Radial flow |
| C. | Free vortex motion |
| D. | Forced vortex |
| Answer» D. Forced vortex | |
| 573. |
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]/ Vr² | |
| 574. |
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water , the horse power required will be |
| A. | Same |
| B. | 0.75 B.H.P |
| C. | B.H.P./0.75 |
| D. | 1.5 B.H.P |
| Answer» C. B.H.P./0.75 | |
| 575. |
In an inward flow reaction turbine |
| A. | The water flows parallel to the axis of the wheel |
| B. | The water enters at the center of the wheel and then flows towards the outer periphery of the wheel |
| C. | The water enters the wheel at the outer periphery and then flows towards the center of the wheel |
| D. | The flow of water is partly radial and partly axial |
| Answer» D. The flow of water is partly radial and partly axial | |
| 576. |
In an outward flow reaction turbine |
| A. | The water flows parallel to the axis of the wheel |
| B. | The water enters at the centre of the wheel and then flows towards the outer periphery of the wheel |
| C. | The water enters the wheel at the outer periphery and then flows towards the centre of the wheel |
| D. | The flow of water is partly radial and partly axial |
| Answer» C. The water enters the wheel at the outer periphery and then flows towards the centre of the wheel | |
| 577. |
The specific speed (Ns) of a centrifugal pump is given by |
| A. | (N√Q)/H2/3 |
| B. | (N√Q)/H3/4 |
| C. | (N√Q)/H |
| D. | (N√Q)/H5/4 |
| Answer» C. (N√Q)/H | |
| 578. |
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. | |
| 579. |
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is |
| A. | Slow speed with radial flow at outlet |
| B. | Medium speed with radial flow at outlet |
| C. | High speed with radial flow at outlet |
| D. | High speed with axial flow at outlet |
| Answer» E. | |
| 580. |
The surface tension of mercury at normal temperature compared to that of water is |
| A. | More |
| B. | Less |
| C. | Same |
| D. | More or less depending on size of glass tube |
| Answer» B. Less | |
| 581. |
The viscosity of water is __________ than that of mercury. |
| A. | Higher |
| B. | Lower |
| C. | Same as |
| D. | None of these |
| Answer» B. Lower | |
| 582. |
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension) |
| A. | 4wd/σ cosα |
| B. | σ cosα/4wd |
| C. | 4σ cosα/wd |
| D. | wd/4σ cosα |
| Answer» D. wd/4σ cosα | |
| 583. |
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° | |
| 584. |
Air vessels in reciprocating pump are used to |
| A. | Smoothen flow |
| B. | Reduce acceleration to minimum |
| C. | Increase pump efficiency |
| D. | Save pump from cavitations |
| Answer» C. Increase pump efficiency | |
| 585. |
The normal stress is same in all directions at a point in a fluid |
| A. | Only when the fluid is frictionless |
| B. | Only when the fluid is incompressible and has zero viscosity |
| C. | When there is no motion of one fluid layer relative to an adjacent layer |
| D. | Irrespective of the motion of one fluid layer relative to an adjacent layer |
| Answer» D. Irrespective of the motion of one fluid layer relative to an adjacent layer | |
| 586. |
A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by |
| A. | l/d² = (l₁/d₁²) + (l₂/d₂²) + (l₃/d₃²) |
| B. | l/d³ = (l₁/d₁³) + (l₂/d₂³) + (l₃/d₃³) |
| C. | l/d⁴ = (l₁/d₁⁴) + (l₂/d₂⁴) + (l₃/d₃⁴) |
| D. | l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵) |
| Answer» E. | |
| 587. |
A double overhung Pelton wheel has |
| A. | Two jets |
| B. | Two runners |
| C. | Four jets |
| D. | Four runners |
| Answer» C. Four jets | |
| 588. |
A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called |
| A. | Steady flow |
| B. | Uniform flow |
| C. | Streamline flow |
| D. | Turbulent flow |
| Answer» D. Turbulent flow | |
| 589. |
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. | |
| 590. |
The working of which of the following hydraulic units is based on Pascal's law? |
| A. | Air lift pump |
| B. | Jet pump |
| C. | Hydraulic coupling |
| D. | Hydraulic press |
| Answer» E. | |
| 591. |
The angle of taper on draft tube is |
| A. | Greater than 15° |
| B. | Greater than 8° |
| C. | Greater than 5° |
| D. | Less than 8° |
| Answer» E. | |
| 592. |
A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because |
| A. | It is easier to see through the glass tube |
| B. | Glass tube is cheaper than a metallic tube |
| C. | It is not possible to conduct this experiment with any other tube |
| D. | All of the above |
| Answer» B. Glass tube is cheaper than a metallic tube | |
| 593. |
The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is |
| A. | (waV/2g) × sin θ |
| B. | (waV/g) × sin θ |
| C. | (waV²/2g) × sin 2θ |
| D. | (waV²/g) × sin θ |
| Answer» D. (waV²/g) × sin θ | |
| 594. |
Maximum impulse will be developed in hydraulic ram when |
| A. | Waste valve closes suddenly |
| B. | Supply pipe is long |
| C. | Supply pipe is short |
| D. | Ram chamber is large |
| Answer» B. Supply pipe is long | |
| 595. |
For starting an axial flow pump, its delivery valve should be |
| A. | Closed |
| B. | Open |
| C. | Depends on starting condition and flow desired |
| D. | Could be either open or closed |
| Answer» C. Depends on starting condition and flow desired | |
| 596. |
Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in meters, and Hd = Delivery head in meters) |
| A. | wQHs |
| B. | wQHd |
| C. | wQ (Hs - Hd) |
| D. | wQ (Hs + Hd) |
| Answer» E. | |
| 597. |
In a centrifugal pump casing, the flow of water leaving the |
| A. | Radial |
| B. | Axial |
| C. | Centrifugal |
| D. | Vortex |
| Answer» E. | |
| 598. |
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/m² | |
| 599. |
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | Hot wire anemometer |
| D. | Pitot tube |
| Answer» E. | |
| 600. |
The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is |
| A. | π w ω² r²/4g |
| B. | π w ω² r³/4g |
| C. | π w ω² r⁴/4g |
| D. | π w ω² r²/2g |
| Answer» B. π w ω² r³/4g | |