mechanical engineering MCQs – Page 181

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

3601. True one-dimensional flow occurs when_________________?
0

A. the magnitude and direction of the velocity do not change from point to point in the fluid

B. velocity, depth, pressure etc. change from point to point in the fluid flow

C. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

D. the direction and magnitude of the veiocity at all points are identical

E. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

3602. Bernoulli equation deals with the law of conservation of__________________?
0

A. work

B. energy

C. force

D. mass

E. momentum

3603. A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to_________________?
0

A. 10,000 kg

B. 1000 kg

C. 100 kg

D. 10 kg

E. 1 kg

3604. According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to_________________?
0

A. more than the weight of the body

B. the weight of the body

C. weight of body plus the weight of the fluid displaced hy the body

D. weight of the fluid displaced by the body

E. less than the weight of the body

3605. The continuity equation is connected with__________________?
0

A. steady/unsteady flow

B. open channel/pipe flow

C. compressibility of fluids

D. viscous/unviscous fluids

E. conservation of mass

3606. Normal depth in open channel flow is the depth of flow corresponding to_______________?
0

A. uniform flow

B. unsteady flow

C. laminar flow

D. steady flow

E. critical flow

3607. The resultant of all normal pressures acts___________________?
0

A. at center of pressure

B. at e.g. of body

C. vertically upwards

D. at metacentre

E. vertically downwards

3608. The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as__________________?
0

A. uniform flow

B. steady flow

C. streamline flow

D. turbulent flow

E. one dimensional flow

3609. In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than_______________?
0

A. viscosity

B. all of the above

C. none of the above

D. surface friction

E. frictional force

3610. A metal with specific gravity of o floating in a fluid of same specific gravity a will____________________?
0

A. float over fluid

B. none of the above

C. sink to bottom

D. partly immersed

E. be fully immersed with top surface at fluid surface

3611. Which of the following meters is not associated with viscosity____________________?
0

A. Say bolt

B. Red wood

C. none of the above

D. Orsat

E. Engler

3612. Which of the following manometer has highest sensitivity_________________?
0

A. U-tube with mercury

B. displacement type

C. inclined U-tube

D. U-tube with water

E. micro-manometer with water

3613. The centre of gravity of the volume of the liquid displaced by an immersed body is called ___________________?
0

A. metacentre

B. centroid

C. centre of gravity

D. centre of buoyancy

E. centre of pressure

3614. A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is_________________?
0

A. 1

B. 5

C. 6

D. 7

3615. Hydrometer is used to determine____________________?
0

A. specific gravity of liquids

B. density

C. specific gravity of gases

D. specific gravity of solids

E. relative humidity

3616. For a body floating in a liquid the normal pressure exerted by the liquid acts at ____________________?
0

A. all points on the surface of the body

B. all of the above

C. e.g. of the body

D. bottom surface of the body

E. metacentre

3617. A body floats in stable equilibrium ____________________?
0

A. none of the above

B. when its e.g. is below its center of buoyancy

C. metacentre has nothing to do with position of e.g. for determining stability

D. when the metancentre is above e.g.

E. when its meatcentric height is zero

3618. The tendency of a liquid surface to contract is due to the following property_____________?
0

A. surface tension

B. viscosity

C. cohesion

D. adhesion

E. elasticity

3619. An open vessel of water is accelerated up an inclined plane. The free water surface will__________________?
0

A. any one of above is possible

B. none of the above

C. be horizontal

D. make an angle in opposite direction to inclination of inclined plane

E. make an angle in direction of inclination of inclined plane

3620. In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 9. Sensitivity of inclined tube to sensitivity of U-tube is equal to________________?
0

A. sin 9

B. cas 9

C. cos 9

D. sin 9

E. tan 9

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