mechanical engineering MCQs – Page 82

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 Review each marked answer and report any item that may be outdated or unclear.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

1621. Addition of lead and bismuth to aluminium results in_________________?
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A. improving machinability

B. improvement of corrosion resistance

C. none of the above

D. improvement of casting characteristics

E. one of the best known age and precipitation-hardening systems

1622. An ideal flow of any fluid must satisfy __________________?
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A. continuity equation

B. Pascal law

C. Bernoullis theorem

D. boundary layer theory

E. Newtons law of viscosity

1623. Structural steel contains following principal alloying elements__________________?
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A. zinc, sulphur, and chromium

B. none of the above

C. nickel, chromium and manganese

D. lead, tin, aluminium

E. tungsten, molybdenum and phosphorous

1624. The correct sequence for descending order of machinability is _____________________?
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A. wrought iron, grey cast iron, low carbon steel

B. wrought iron,low carbon steel, grey cast iron

C. low carbon steel, grey cast iron, wrought iron

D. grey cast iron, wrought iron, low carbon steel

E. grey cast iron, low carbon steel, wrought iron

1625. The tensile strength of wrought iron is maximum _________________?
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A. unpredictable

B. perpendicular to lines of slag distribution

C. along the lines of slag distribution

D. uniform in all directions

E. none of the above

1626. Which is false statement about properties of aluminium ___________________?
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A. modulus of elasticity is fairly low

B. wear resistance is very good

C. fatigue strength is not high

D. creep strength limits its use to fairly low temperatures

E. corrosion resistance is good

1627. Taps, dies and drills contain carbon________________?
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A. below 0.5%

B. below 1%

C. above 2.2%

D. nil

E. above 1%

1628. The tendency of a liquid surface to contract is due to the following property_____________?
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A. cohesion

B. viscosity

C. adhesion

D. surface tension

E. elasticity

1629. The normal stress is same in all directions at a point in a fluid_______________?
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A. irrespective of the motion of one fluid layer relative to an adjacent layer

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. in case of an ideal fluid

E. only when the fluid is frictionless

1630. The number of electrons in 1 cm3 of metal would be of the order of_______________?
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A. 1052

B. 1010

C. TO16

D. 1022

E. 1040

1631. 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

1632. Flow of water in a pipe about 3 metres in diameter can be measured by__________________?
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A. venturi

B. orifice plate

C. pitot tube

D. nozzle

E. rotameter

1633. Eutectoid steel contains following percentage of carbon_______________?
0

A. 0.02%

B. 0.63%

C. 0.8%

D. 0.30%

E. 1.2%.

1634. Inconel is an alloy of___________________?
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A. nickel, chromium and iron

B. nickel, chromium

C. nickel, copper

D. nickel, lead

E. nickel, zinc

1635. An engineers hammer is made of___________________?
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A. mild steel

B. forged steel

C. H.S.S

D. cast iron

E. high carbon steel

1636. Dimensions of surface tension are___________________?
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A. MlLt

B. MlL r2

C. MlLT2

D. MlL2T2

E. MlLTx

1637. The alloy used for making electrical resistances and heating elements is____________________?
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A. invar

B. nichrome

C. magnin

D. elinvar

E. peiminvar

1638. If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its__________________?
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A. specific density

B. none of the above

C. specific mass

D. specific weight

E. specific gravity

1639. Delta iron occurs at temperature of_______________?
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A. above melting point

B. between 910C and 1400C

C. room temperature

D. none of the above

E. between 1400C and 1539C

1640. Bronze contains_____________________?
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A. 70-75% copper and rest tin

B. 85-92% copper and rest tin with little lead and nickel

C. 70% copper and 30% zinc

D. 90% copper and 10% tin

E. 90% copper and 10% zinc

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