mechanical engineering MCQs – Page 185

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 Review each marked answer and report any item that may be outdated or unclear.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

3681. The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called_______________?
0

A. reaction

B. center of pressure

C. buoyancy

D. metacentre

E. upthrust

3682. Resultant pressure of the liquid in the case of an immersed body acts through____________________?
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A. centre of pressure

B. in between e.g. and centre of pressure

C. centre of gravity

D. centre of buoyancy

E. metacentre

3683. Differential monometer is used to measure___________________?
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A. difference of pressure between two points

B. very low pressure

C. atmospheric pressure

D. velocity in pipes

E. pressure in pipes, channels etc.

3684. All the terms of energy in Bernoullis equation have dimension of_______________?
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A. time

B. length

C. mass

D. energy

E. work

3685. The flow in which conditions do not change with time at any point, is known as_________________?
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A. turbulent flow

B. one dimensional flow

C. steady flow

D. streamline flow

E. uniform flow

3686. Uniform flow occurs when_____________________?
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A. the velocity of successive fluid paiticles, at any point, is the same at successive periods of time

B. the direction and magnitude of the velocity at all points are identical

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

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

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

3687. If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its__________________?
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A. none of the above

B. specific density

C. specific gravity

D. specific weight

E. specific mass

3688. The fluid forces considered in the Navier Stokes equation are__________________?
0

A. none of the above

B. gravity, pressure and viscous

C. pressure, viscous and turbulent

D. gravity, pressure and turbulent

E. gravity, viscous and turbulent

3689. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as_________________?
0

A. none of the above

B. center of buoyancy

C. center of gravity

D. meta center

E. center of pressure

3690. Kinematic viscosity is dependent upon__________________?
0

A. level

B. density

C. flow

D. distance

E. pressure

3691. The velocity of jet of water travelling out of opening in a tank filled with water is proportional to_________________?
0

A. h2

B. h2

C. V/T

D. head of water (h)

E. h3/1

3692. Steady flow occurs when___________________?
0

A. the direction and magnitude of the velocity at all points are identical

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

C. the velocity of successive fluid particles, at any point, is the same at successive periods of time

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

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

3693. A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?
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A. 1:V5?

B. 01:02.5

C. 1:25

D. 1 : 5

E. 1 : 53/2

3694. Metacentric height is the distance between the metacentre and_______________?
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A. center of gravity

B. none of the above

C. center of pressure

D. center of buoyancy

E. water surface

3695. Surface tension__________________?
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A. acts in the plane of the interface normal to any line in the surface

B. decreases with fall in temperature

C. has no units

D. is a function of the curvature of the interface

E. is also known as capillarity

3696. A streamline is defined as the line________________?
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A. of equal yelocity in a flow

B. parallel to central axis flow

C. which occurs in all flows

D. along which the pressure drop is uniform

E. parallel to outer surface of pipe

3697. Rotameter is a device used to measure______________?
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A. velocity of fluid

B. rotation

C. absolute pressure

D. velocity of air

E. flow

3698. The angle of contact in case of a liquid depends upon___________________?
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A. the nature of the liquid and the solid

B. the material which exists above the free surface of the liquid

C. both of die above

D. any one of the above

E. none of die above

3699. Dimensions of surface tension are___________________?
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A. MlL r2

B. MlL2T2

C. MlLTx

D. MlLT2

E. MlLt

3700. A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is____________________?
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A. 30,000 kg

B. 9,000 kg

C. 27,000 kg

D. 13,500 kg

E. 18,000 kg

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