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.
| 501. |
_ A one dimensional flow is one which$? |
| A. | Is uniform flow |
| B. | Is steady uniform flow |
| C. | Takes place in straight lines |
| D. | Involves zero transverse component of flow |
| Answer» E. | |
| 502. |
_ A structure, whose width is __________ the width of the channel, is called a flumed structure.$? |
| A. | Less than |
| B. | More than |
| C. | Equal |
| D. | None of these |
| Answer» B. More than | |
| 503. |
_ In case of flow through parallel pipes,$? |
| A. | The head loss for all the pipes is same |
| B. | The total discharge is equal to the sum of discharges in the various pipes |
| C. | The total head loss is the sum of head losses in the various pipes |
| D. | Both (A) and (B) |
| Answer» E. | |
| 504. |
_ For pipes, turbulent flow occurs when Reynolds number is$? |
| A. | Less than 2000 |
| B. | Between 2000 and 4000 |
| C. | More than 4000 |
| D. | Less than 4000 |
| Answer» D. Less than 4000 | |
| 505. |
_ Bernoulli equation deals with the law of conservation of$? |
| A. | Mass |
| B. | Momentum |
| C. | Energy |
| D. | Work |
| Answer» D. Work | |
| 506. |
_ The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is$? |
| A. | ηh = ηo × ηm |
| B. | ηm = ηm × ηh |
| C. | ηo = ηh × ηm |
| D. | None of these |
| Answer» D. None of these | |
| 507. |
_ Any change in load is adjusted by adjusting following parameter on turbine$? |
| A. | Net head |
| B. | Absolute velocity |
| C. | Blade velocity |
| D. | Flow |
| Answer» E. | |
| 508. |
_ A turbine pump is basically a centrifugal pump equipped additionally with$? |
| A. | Adjustable blades |
| B. | Backward curved blades |
| C. | Vaned diffusion casing |
| D. | Inlet guide blades |
| Answer» D. Inlet guide blades | |
| 509. |
_ The pressure of air __________ with the increase of height from the surface of the earth.$? |
| A. | Does not change |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» C. Increases | |
| 510. |
_ Free surface of a liquid tends to contract to the smallest possible area due to force of$? |
| A. | Surface tension |
| B. | Viscosity |
| C. | Friction |
| D. | Cohesion |
| Answer» B. Viscosity | |
| 511. |
_ The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe)$? |
| A. | d = (D⁵/8fl)1/2 |
| B. | d = (D⁵/8fl)1/3 |
| C. | d = (D⁵/8fl)1/4 |
| D. | d = (D⁵/8fl)1/5 |
| Answer» D. d = (D‚Äö√Ö¬µ/8fl)1/5 | |
| 512. |
_ A flow through a long pipe at decreasing rate is called __________ uniform flow.$? |
| A. | Steady |
| B. | Unsteady |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 513. |
_ The pressure in Pascal’s at a depth of 1 m below the free surface of a body of water will be equal to$? |
| A. | 1 Pa |
| B. | 91 Pa |
| C. | 981 Pa |
| D. | 9810 Pa |
| Answer» E. | |
| 514. |
_ When the Venturimeter is inclined, then for a given flow it will show __________ reading.$? |
| A. | Same |
| B. | More |
| C. | Less |
| D. | None of these |
| Answer» B. More | |
| 515. |
_ The intensity of pressure at any point, in a liquid, is$? |
| A. | Directly proportional to the area of the vessel containing liquid |
| B. | Directly proportional to the depth of liquid from the surface |
| C. | Directly proportional to the length of the vessel containing liquid |
| D. | Inversely proportional to the depth of liquid from the surface |
| Answer» C. Directly proportional to the length of the vessel containing liquid | |
| 516. |
_ The flow ratio of Francis turbine is defined as the ratio of the$? |
| 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 | |
| 517. |
_ The kinematic viscosity is the$? |
| A. | Ratio of absolute viscosity to the density of the liquid |
| B. | Ratio of density of the liquid to the absolute viscosity |
| C. | Product of absolute viscosity and density of the liquid |
| D. | Product of absolute viscosity and mass of the liquid |
| Answer» B. Ratio of density of the liquid to the absolute viscosity | |
| 518. |
_ The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is$? |
| 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. | |
| 519. |
_ 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$? |
| A. | Same |
| B. | 0.75 B.H.P |
| C. | B.H.P./0.75 |
| D. | 1.5 B.H.P |
| Answer» C. B.H.P./0.75 | |
| 520. |
_ In axial flow fans and turbines, fluid enters and leaves as follows$? |
| A. | Radially, axially |
| B. | Axially, radially |
| C. | Axially, axially |
| D. | Radially, radially |
| Answer» D. Radially, radially | |
| 521. |
_ If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm", the pressure at a depth of 50 m below the oil surface will be$? |
| A. | 2 meters of water column |
| B. | 3 meters of water column |
| C. | 5 meters of water column |
| D. | 6 meters of water Column |
| Answer» E. | |
| 522. |
_ When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure$? |
| A. | Varies as the square of the radial distance |
| B. | Increases linearly as its radial distance |
| C. | Increases as the square of the radial distance |
| D. | Decreases as the square of the radial distance |
| Answer» B. Increases linearly as its radial distance | |
| 523. |
_ Slip of a reciprocating pump is defined as the$? |
| A. | Ratio of actual discharge to the theoretical discharge |
| B. | Sum of actual discharge and the theoretical discharge |
| C. | Difference of theoretical discharge and the actual discharge |
| D. | Product of theoretical discharge and the actual discharge |
| Answer» D. Product of theoretical discharge and the actual discharge | |
| 524. |
_ The discharge through a siphon spillway is$? |
| A. | Cd √ó a √ó ‚à ö(2gH) |
| B. | Cd √ó a √ó ‚à ö(2g) √ó H3/2 |
| C. | Cd √ó a √ó ‚à ö(2g) √ó H2 |
| D. | Cd √ó a √ó ‚à ö(2g) √ó H5/2 |
| Answer» B. Cd ‚àö√≥ a ‚àö√≥ ‚Äö√ √∂(2g) ‚àö√≥ H3/2 | |
| 525. |
_ The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)$? |
| A. | w √ó Q √ó H |
| B. | w √ó Q √ó hf |
| C. | w √ó Q (H - hf) |
| D. | w √ó Q (H + hf) |
| Answer» D. w ‚àö√≥ Q (H + hf) | |
| 526. |
_ Reynolds number is significant in$? |
| 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» C. Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls | |
| 527. |
_ The centre of pressure acts __________ the centre of gravity of immersed surface.$? |
| A. | At |
| B. | Above |
| C. | Below |
| D. | None of these |
| Answer» D. None of these | |
| 528. |
_ A balloon lifting in air follows the following principle$? |
| A. | Law of gravitation |
| B. | Archimedes principle |
| C. | Principle of buoyancy |
| D. | All of the above |
| Answer» E. | |
| 529. |
_ The body will float if the force of buoyancy is __________ the weight of the liquid displaced.$? |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 530. |
_ A body floating in a liquid is said to be in neutral equilibrium, if its metacentre$? |
| A. | Coincides with its centre of gravity |
| B. | Lies above its centre of gravity |
| C. | Lies below its centre of gravity |
| D. | Lies between the centre of buoyancy and centre of gravity |
| Answer» B. Lies above its centre of gravity | |
| 531. |
_ Viscous force is the __________ of shear stress due to viscosity and cross-section area of flow.$? |
| A. | Sum |
| B. | Different |
| C. | Product |
| D. | Ratio |
| Answer» D. Ratio | |
| 532. |
_ Low specific speed of turbine implies it is$? |
| A. | Propeller turbine |
| B. | Francis turbine |
| C. | Impulse turbine |
| D. | Any one of the above |
| Answer» D. Any one of the above | |
| 533. |
_ A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will$? |
| A. | Increase |
| B. | Decrease |
| C. | Remain same |
| D. | Increase/decrease depending on depth of immersion |
| Answer» D. Increase/decrease depending on depth of immersion | |
| 534. |
_ Air vessels in reciprocating pump are used to$? |
| A. | Smoothen flow |
| B. | Reduce acceleration to minimum |
| C. | Increase pump efficiency |
| D. | Save pump from cavitations |
| Answer» C. Increase pump efficiency | |
| 535. |
_ According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to$? |
| A. | The weight of the body |
| B. | More than the weight of the body |
| C. | Less than the weight of the body |
| D. | Weight of the fluid displaced by the body |
| Answer» E. | |
| 536. |
_ The atmospheric pressure with rise in altitude decreases$? |
| A. | Linearly |
| B. | First slowly and then steeply |
| C. | First steeply and then gradually |
| D. | Unpredictable |
| Answer» C. First steeply and then gradually | |
| 537. |
_ The time oscillation of a floating body with increase in meatcentric height will be$? |
| A. | Same |
| B. | Higher |
| C. | Lower |
| D. | Lower/higher depending on weight of body |
| Answer» D. Lower/higher depending on weight of body | |
| 538. |
_ When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called$? |
| A. | Gauge pressure |
| B. | Absolute pressure |
| C. | Positive gauge pressure |
| D. | Vacuum pressure |
| Answer» D. Vacuum pressure | |
| 539. |
_ Reynold's number is the ratio of the inertia force to the$? |
| A. | Surface tension force |
| B. | Viscous force |
| C. | Gravity force |
| D. | Elastic force |
| Answer» C. Gravity force | |
| 540. |
_ The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.$? |
| A. | One-half |
| B. | One-third |
| C. | Two-third |
| D. | None of these |
| Answer» C. Two-third | |
| 541. |
_ Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as$? |
| A. | Lift |
| B. | Drag |
| C. | Stagnation pressure |
| D. | Bulk modulus |
| Answer» C. Stagnation pressure | |
| 542. |
_ Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of$? |
| A. | High initial and maintenance cost |
| B. | Lower discharge |
| C. | Lower speed of operation |
| D. | Necessity of air vessel |
| Answer» B. Lower discharge | |
| 543. |
_ The hammer blow in pipes occurs when$? |
| A. | There is excessive leakage in the pipe |
| B. | The pipe bursts under high pressure of fluid |
| C. | The flow of fluid through the pipe is suddenly brought to rest by closing of the valve |
| D. | The flow of fluid through the pipe is gradually brought to rest by closing of the valve |
| Answer» D. The flow of fluid through the pipe is gradually brought to rest by closing of the valve | |
| 544. |
_ The buoyancy depends on$? |
| A. | Mass of liquid displaced |
| B. | Viscosity of the liquid |
| C. | Pressure of the liquid displaced |
| D. | Depth of immersion |
| Answer» B. Viscosity of the liquid | |
| 545. |
_ The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel)$? |
| A. | (q/g)1/2 |
| B. | (q²/g)1/3 |
| C. | (q³/g)1/4 |
| D. | (q‚Å¥/g)1/5 |
| Answer» C. (q¬¨‚â•/g)1/4 | |
| 546. |
_ If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge$? |
| A. | Same quantity of liquid |
| B. | 0.75 Q |
| C. | Q/0.75 |
| D. | 1.5 Q |
| Answer» B. 0.75 Q | |
| 547. |
_ An internal mouthpiece is said to be running __________ if the length of the mouthpiece is more than three times the diameter of the orifice.$? |
| A. | Free |
| B. | Partially |
| C. | Full |
| D. | None of these |
| Answer» D. None of these | |
| 548. |
_ Coefficient of contraction is the ratio of$? |
| A. | Actual velocity of jet at vena contracta to the theoretical velocity |
| B. | Loss of head in the orifice to the head of water available at the exit of the orifice |
| C. | Loss of head in the orifice to the head of water available at the exit of the orifice |
| D. | Area of jet at vena-contracta to the area of orifice |
| Answer» E. | |
| 549. |
_ The intensity of pressure on an immersed surface __________ with the increase in depth.$? |
| A. | Does not change |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» C. Decreases | |
| 550. |
_ A hydraulic accumulator is a device used to store _________ energy which may be supplied to a machine later on.$? |
| A. | Strain |
| B. | Pressure |
| C. | Kinetic |
| D. | None of these |
| Answer» C. Kinetic | |