mechanical engineering MCQs – Page 90

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 Review each marked answer and report any item that may be outdated or unclear.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

1781. Specific weight of water in S.I. units is equal to ________________?
0

A. 9.81 N/m3

B. 10000 N/m3

C. 9.81 xlO6N/m3

D. 1000 N/m3

E. 9.81 xlO3 N/m3

1782. The units of dynamic or absolute viscosity are__________________?
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A. newton-sec per meter

B. metres2 per sec

C. none of the above

D. kg sec/meter

E. newton-sec2 per meter

1783. The surface hardness of the following order is achieved by nitriding operation__________________?
0

A. 1000 to 1100 VPN

B. 600 VPN

C. 1500 VPN

D. 2000 VPN

E. 250 VPN

1784. Paramagnetic alpha iron changes to gamma iron at_______________?
0

A. 1440C

B. 770C

C. 910C

D. 1539C

E. none of the above

1785. Pearlite is a combination of___________________?
0

A. ferrite and cementite

B. cementite and gamma iron

C. pearlite and ferrite

D. ferrite and austenite

E. ferrite and iron graphite

1786. Brass (alloy of copper and zinc) is an example of__________________?
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A. interstitial solid solution

B. none of the above

C. intermetallic compounds

D. all of the above

E. substitutional solid solution

1787. Neutral solution is one which has pH value__________________?
0

A. greater than 7

B. pH value has nothing to do with neutral solution

C. equal to 7

D. none of the above

E. less than 7

1788. A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?
0

A. atomic change

B. physical change

C. solidus change

D. molecular change

E. allotropic change

1789. Capillary action is due to the_________________?
0

A. cohesion of the liquid

B. adhesion of the liquid molecules and the molecules on the surface of a solid

C. none of the above

D. all of the above

E. surface tension

1790. A liquid would wet the solid, if adhesion forces as compared to cohesion forces are________________?
0

A. more

B. less at low temperature and more at high temperature

C. there is no such criterion

D. less

E. equal

1791. Weld decay is the phenomenon found with _________________?
0

A. cast iron

B. wrought iron

C. non-ferrous materials

D. stainless steel

E. mild steel

1792. Railway rails are normally made of_______________?
0

A. mild steel

B. tungsten steel

C. cast iron steel

D. high carbon

E. alloy steel

1793. An ideal flow of any fluid must fulfill the following____________________?
0

A. Newtons law of viscosity

B. Newtons law of motion

C. Boundary layer theory

D. Continuity equation

E. Pascal law

1794. A fluid in equilibrium cant sustain____________________?
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A. shear stress

B. compressive stress

C. tensile stress

D. bending stress

E. all of the above

1795. Argentite is the principal ore or raw material for _________________?
0

A. zinc

B. lead

C. tin

D. aluminium

E. silver

1796. A perfect gas____________________?
0

A. has zero viscosity

B. none of the above

C. has constant viscosity

D. is of theoretical interest

E. is in compressible

1797. Free cutting steels_____________________?
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A. require least cutting force

B. contain carbon in free form

C. are used where ease in machining is the criterion

D. can be cut freely even under adverse conditions

E. do not exist

1798. Constantant an alloy used in thermocouples is an alloy of __________________?
0

A. copper and tin

B. copper and nickel

C. copper and chromium

D. copper and zinc

E. copper and iron

1799. Which of the following instruments is used to measure flow on the application of Bernoullis theorem_________________?
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A. nozzle

B. Venturimeter

C. all of the above

D. pitot tube

E. Orifice plate

1800. Hardness of martensite is about___________________?
0

A. RC 32

B. RC 80

C. RC 65

D. RC 48

E. RC 57

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