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.
| 651. |
_The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.$? |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 652. |
_The pressure of a liquid measured with the help of a Piezometer tube is$? |
| A. | Vacuum pressure |
| B. | Gauge pressure |
| C. | Absolute pressure |
| D. | Atmospheric pressure |
| Answer» C. Absolute pressure | |
| 653. |
_Which of the following pump is preferred for flood control and irrigation applications?$? |
| A. | Centrifugal pump |
| B. | Axial flow pump |
| C. | Mixed flow pump |
| D. | Reciprocating pump |
| Answer» C. Mixed flow pump | |
| 654. |
_Center of pressure on an inclined plane is$? |
| A. | At the Centroid |
| B. | Above the Centroid |
| C. | Below the Centroid |
| D. | At metacentre |
| Answer» D. At metacentre | |
| 655. |
_The pressure of liquid at throat in a Venturimeter is __________ than that at inlet.$? |
| A. | Higher |
| B. | Lower |
| C. | Same |
| D. | None of these |
| Answer» C. Same | |
| 656. |
_The normal stress is same in all directions at a point in a fluid$? |
| 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 | |
| 657. |
_A hydraulic ram is a device used to$? |
| A. | Store the energy of water |
| B. | Increase the pressure of water |
| C. | To lift water from deep wells |
| D. | To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height |
| Answer» E. | |
| 658. |
_The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by$? |
| A. | 2V/(vr - v) |
| B. | 2V/(vr + v) |
| C. | V/(vr - v) |
| D. | V/(vr + v) |
| Answer» C. V/(vr - v) | |
| 659. |
_The discharge over a triangular notch is$? |
| A. | Inversely proportional to H3/2 |
| B. | Directly proportional to H3/2 |
| C. | Inversely proportional to H5/2 |
| D. | Directly proportional to H5/2 |
| Answer» E. | |
| 660. |
_The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.$? |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 661. |
_When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be$? |
| A. | Horizontal |
| B. | Nearly horizontal |
| C. | Steep |
| D. | First rise and then fall |
| Answer» C. Steep | |
| 662. |
_A fluid having no viscosity is known as$? |
| A. | Real fluid |
| B. | Ideal fluid |
| C. | Newtonian fluid |
| D. | Non-Newtonian fluid |
| Answer» C. Newtonian fluid | |
| 663. |
_The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe)$? |
| A. | v²/2g |
| B. | 0.5v²/2g |
| C. | 0.375v²/2g |
| D. | 0.75v²/2g |
| Answer» C. 0.375v¬¨‚â§/2g | |
| 664. |
_Multistage centrifugal pumps are used to$? |
| A. | Give high discharge |
| B. | Produce high heads |
| C. | Pump viscous fluids |
| D. | All of these |
| Answer» C. Pump viscous fluids | |
| 665. |
_By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. The saving in case of a double acting reciprocating pump is$? |
| A. | 39.2% |
| B. | 48.8% |
| C. | 84.8% |
| D. | 88.4% |
| Answer» B. 48.8% | |
| 666. |
_An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called$? |
| A. | Weir |
| B. | Notch |
| C. | Orifice |
| D. | None of these |
| Answer» C. Orifice | |
| 667. |
_If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water$? |
| A. | 51 cm |
| B. | 50 cm |
| C. | 52 cm |
| D. | 52.2 cm |
| Answer» B. 50 cm | |
| 668. |
_The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is$? |
| A. | μ π³ N² R² /1800 t |
| B. | μ π³ N² R⁴ /1800 t |
| C. | μ π³ N² R² /3600 t |
| D. | μ π³ N² R⁴ /3600 t |
| Answer» C. ≈í¬∫ ≈ì√Ѭ¨‚â• N¬¨‚⧠R¬¨‚⧠/3600 t | |
| 669. |
_The value of mass density in kg-sec-V-m⁴ for water at 0°C is$? |
| A. | 1 |
| B. | 1000 |
| C. | 100.9 |
| D. | 101.9 |
| Answer» E. | |
| 670. |
_An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.$? |
| A. | Less than twice |
| B. | More than twice |
| C. | Less than three times |
| D. | More than three times |
| Answer» D. More than three times | |
| 671. |
The discharge through a channel of trapezoidal section is maximum when$? |
| A. | Width of channel at the top is equal to twice the width at the bottom |
| B. | Depth of channel is equal to the width at the bottom |
| C. | The sloping side is equal to half the width at the top |
| D. | The sloping side is equal to the width at the bottom |
| Answer» D. The sloping side is equal to the width at the bottom | |
| 672. |
Which of the following pump is generally used to pump highly viscous fluid?$? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Air lift pump |
| D. | Screw pump |
| Answer» E. | |
| 673. |
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than$? |
| A. | Frictional force |
| B. | Viscosity |
| C. | Surface friction |
| D. | All of the above |
| Answer» E. | |
| 674. |
Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)$? |
| A. | Cc √ó Cv |
| B. | Cc √ó Cr |
| C. | Cv √ó Cr |
| D. | Cc/Cr |
| Answer» B. Cc ‚àö√≥ Cr | |
| 675. |
Head developed by a centrifugal pump is$? |
| A. | Proportional to diameter of impeller |
| B. | Proportional to speed of impeller |
| C. | Proportional to diameter and speed of impeller |
| D. | None of the above |
| Answer» D. None of the above | |
| 676. |
A Piezometer tube is used only for measuring$? |
| A. | Low pressure |
| B. | High pressure |
| C. | Moderate pressure |
| D. | Vacuum pressure |
| Answer» D. Vacuum pressure | |
| 677. |
According to Bernoulli's equation$? |
| A. | Z + p/w + v²/2g = constant |
| B. | Z + p/w - v²/2g = constant |
| C. | Z - p/w + v²/2g = constant |
| D. | Z - p/w - v²/2g = constant |
| Answer» B. Z + p/w - v¬¨‚â§/2g = constant | |
| 678. |
Normal depth in open channel flow is the depth of flow corresponding to$? |
| A. | Steady flow |
| B. | Unsteady flow |
| C. | Laminar flow |
| D. | Uniform flow |
| Answer» E. | |
| 679. |
The coefficient of viscosity may be determined by$? |
| A. | Capillary tube method |
| B. | Orifice type viscometer |
| C. | Rotating cylinder method |
| D. | All of these |
| Answer» E. | |
| 680. |
Fluid is a substance that$? |
| 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. | |
| 681. |
Euler's number is the ratio of __________ force to pressure force.$? |
| A. | Inertia |
| B. | Gravity |
| C. | Viscous |
| D. | None of these |
| Answer» B. Gravity | |
| 682. |
A Francis turbine is used when the available head of water is$? |
| A. | 0 to 25 m |
| B. | 25 m to 250 m |
| C. | Above 250 m |
| D. | None of these |
| Answer» C. Above 250 m | |
| 683. |
Non uniform flow occurs when$? |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | Velocity, depth, pressure, etc. change from point to point in the fluid flow |
| D. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| Answer» D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane | |
| 684. |
The width of the bucket for a Pelton wheel is generally ________ the diameter of jet.$? |
| A. | Double |
| B. | Three times |
| C. | Four times |
| D. | Five times |
| Answer» E. | |
| 685. |
The velocity corresponding to Reynold number of 2000 is called$? |
| A. | Sub-sonic velocity |
| B. | Super-sonic velocity |
| C. | Lower critical velocity |
| D. | Higher critical velocity |
| Answer» D. Higher critical velocity | |
| 686. |
In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be$? |
| A. | 1/16 to 1/8 |
| B. | 1/8 to 1/4 |
| C. | 1/4 to 1/3 |
| D. | 1/3 to 1/2 |
| Answer» E. | |
| 687. |
The pressure measured with the help of a Piezometer tube is in$? |
| A. | N/mm2 |
| B. | N/m2 |
| C. | Head of liquid |
| D. | All of these |
| Answer» D. All of these | |
| 688. |
When a body is placed over a liquid, it will float if$? |
| A. | Gravitational force is equal to the up-thrust of the liquid |
| B. | Gravitational force is less than the up-thrust of the liquid |
| C. | Gravitational force is more than the up-thrust of the liquid |
| D. | None of the above |
| Answer» C. Gravitational force is more than the up-thrust of the liquid | |
| 689. |
Motion of a liquid in a volute casing of a centrifugal pump is an example of$? |
| A. | Rotational flow |
| B. | Radial |
| C. | Forced spiral vortex flow |
| D. | Spiral vortex flow |
| Answer» E. | |
| 690. |
According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.$? |
| A. | Equal to |
| B. | Directly proportional |
| C. | Inversely proportional |
| D. | None of these |
| Answer» C. Inversely proportional | |
| 691. |
The working of which of the following hydraulic units is based on Pascal's law?$? |
| A. | Air lift pump |
| B. | Jet pump |
| C. | Hydraulic coupling |
| D. | Hydraulic press |
| Answer» E. | |
| 692. |
Axial flow pump is started with its delivery valve$? |
| A. | Kept fully closed |
| B. | Kept fully open |
| C. | Irrespective of any position |
| D. | Kept 50% open |
| Answer» C. Irrespective of any position | |
| 693. |
Property of a fluid by which its own molecules are attracted is called$? |
| A. | Adhesion |
| B. | Cohesion |
| C. | Viscosity |
| D. | Compressibility |
| Answer» C. Viscosity | |
| 694. |
Low specific speed of a pump implies it is$? |
| A. | Centrifugal pump |
| B. | Mixed flow pump |
| C. | Axial flow pump |
| D. | None of the above |
| Answer» B. Mixed flow pump | |
| 695. |
The shear stress between the two liquid layers is __________ proportional to the distance between two layers.$? |
| A. | Directly |
| B. | Inversely |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 696. |
Unit of surface tension is$? |
| A. | Energy/unit area |
| B. | Velocity/unit area |
| C. | Both of the above |
| D. | It has no units |
| Answer» B. Velocity/unit area | |
| 697. |
The specific weight of water in S.I. units is taken as$? |
| A. | 9.81 kN/m3 |
| B. | 9.81 √ó 103 N/m3 |
| C. | 9.81 √ó 10-6 N/mm3 |
| D. | Any one of these |
| Answer» E. | |
| 698. |
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea?$? |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | Hot wire anemometer |
| D. | Pitot tube |
| Answer» E. | |
| 699. |
The pressure at a point in a fluid will not be same in all the directions when the fluid is$? |
| A. | Moving |
| B. | Viscous |
| C. | Viscous and static |
| D. | Viscous and moving |
| Answer» E. | |
| 700. |
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be$? |
| A. | 500 kg |
| B. | 1000 kg |
| C. | 1500 kg |
| D. | 2000 kg |
| Answer» E. | |