mechanical engineering MCQs – Page 101

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 Review each marked answer and report any item that may be outdated or unclear.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

2001. Two dimensional flow occurs when________________?
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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 fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

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

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

2002. For pipes, turbulent flow occurs when Reynolds number is _____________________?
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A. none of the above

B. less than 2000

C. between 2000 and 4000

D. less than 4000

E. more than 4000

2003. Reheating of steam under ideal conditions takes place at constant __________________?
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A. enthaply

B. all of the above

C. temperature

D. entropy

E. pressure

2004. The balanced draft furnace is one using _________________________?
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A. induced draft fan and forced draft fan

B. induced draft fan and chimney

C. none of the above

D. any one of the above

E. forced draft fan and chimney

2005. At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?
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A. zero

B. none of the above

C. minimum

D. depends on temperature also

E. maximum

2006. In the case of steady flow of a fluid, the acceleration of any fluid particle is________________?
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A. zero under limiting conditions

B. zero

C. constant

D. variable

E. never zero

2007. Pitot tube is used for measurement of_________________?
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A. flow

B. pressure

C. velocity

D. dsscharge

E. viscosity

2008. In a free vortex motion, the radial component of velocity everywhere is________________?
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A. maximum

B. non-zero and finite

C. zero

D. minimum

E. unpredictable

2009. The steam temperature with increase in load in case of a boiler fitted with radiation super heater________________?
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A. decreases

B. first increases and then decreases

C. increases

D. unpredictable

E. remains unaffected

2010. The normal stress in a fluid will be constant in all directions at a point only if__________________________?
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A. it is frictionless

B. it is at rest

C. it has zero viscosity

D. it is incompressible

E. it has uniform viscosity

2011. Water at pressure of 4 kg/cm2 and 160C temperature when exposed to atmosphere will_________________?
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A. boil

B. cool down

C. none of the above

D. flash i.e. get converted into steam

E. remain as it was

2012. Piezometer is used to measure_____________________?
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A. flow

B. pressure in pipe, channels etc.

C. atmospheric pressure

D. very low pressures

E. difference of pressure between two points

2013. A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
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A. 2 m/sec

B. 25 m/sec

C. 50 m/sec

D. 250 m/sec

E. 10 m/sec

2014. The density of water is 1000 kg/m3 at__________________?
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A. 4C D. 20C

B. all temperature

C. 0C

D. 0K

2015. In natural circulation type boiler _______________?
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A. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

B. water is converted into steam in one . pass without any recirculation

C. water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture of water and steam

D. water is fed at atmospheric pressure

E. feed pump is employed to supplement natural circulation in water wall type furnace

2016. Which of the following manometer has highest sensitivity_________________?
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A. U-tube with water

B. displacement type

C. micro-manometer with water

D. U-tube with mercury

E. inclined U-tube

2017. The buoyancy depends on___________________?
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A. depth of immersion

B. mass of liquid displaced

C. none of the above