mechanical engineering MCQs – Page 81

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 Review each marked answer and report any item that may be outdated or unclear.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

1601. Which of the following represents the allotropic forms of iron__________________?
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A. body centred cubic a-iron and face centred cubic a-iron

B. alpha iron, beta iron and gamma iron

C. none of the above

D. alpha iron and beta iron

E. alpha iron, gamma from and delta iron

1602. Materials after cold working are subjected to following process to relieve stresses__________________?
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A. normalising

B. annealing

C. tempering

D. hot working

E. special heat treatment

1603. Chromium in steel_________________?
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A. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

B. improves cutting ability and reduces hardenability

C. improves wear resistance, cutting ability and toughness

D. makes steel hard

E. gives ductility, toughness, tensile strength and anticorrosion properties

1604. Pick up the wrong statement Nickel and chromium in steel help in _________________?
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A. improving the resilience and ductility

B. raising the elastic limit

C. providing high strength at elevated temperatures

D. improving machining properties

E. providing corrosion resistance

1605. The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?
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A. above recrystallization temperature

B. 1050C

C. below recrystallisation temperature

D. 770C

E. 910C

1606. Babbit metal is a_________________?
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A. copper base alloy

B. A. and C. above

C. tin base alloy

D. all of the above

E. lead base alloy

1607. Rain drops are spherical because of__________________?
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A. viscosity

B. atmospheric pressure

C. none of the above

D. surface tension forces

E. air resistance

1608. Carbon in iron is an example of__________________?
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A. interstitial solid solution

B. none of the above.

C. all of the above

D. intermetallic compounds

E. substitutional solution

1609. Nickel in steel___________________?
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A. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

B. improves wear resistance, cutting ability and toughness

C. none of the above

D. gives ductility, toughness, tensile strength and anticorrosion properties

E. improves cutting ability and reduces hardenability

1610. Addition of silicon to aluminium results in____________________?
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A. none of the above

B. improvement of casting characteristics

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

D. improving machinability

E. improvement of corrosion resistance

1611. The resultant of all normal pressures acts___________________?
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A. vertically upwards

B. at e.g. of body

C. at metacentre

D. at center of pressure

E. vertically downwards

1612. The percentage of carbon in low carbon steel is__________________?
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A. 0.30%

B. 0.05%

C. 0.7%.

D. 0.15%

E. 0.50%

1613. Preheating is essential in welding ___________________?
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A. all non-ferrous materials

B. none of the above

C. high speed steel

D. cast iron

E. all of the above

1614. Steel contains____________________?
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A. high quantities of sulphur

B. 50% or more iron

C. elements like phosphorus, sulphur and silicon in varying quantities

D. 80% or more iron

E. alloying elements like chromium, tungsten nickel and copper

1615. Which of the following element results in presence of free graphite in C.I_________________?
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A. silicon

B. carbon

C. sulphur

D. phosphorous

E. manganese

1616. Pig iron is the name given to________________?
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A. iron scrap

B. product of blast furnace made by reduction of iron ore

C. raw material for blast furnace

D. iron containing huge quantities of carbon

E. iron in molten form in the ladles

1617. By severely deforming a metal in a particular direction it becomes _________________?
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A. homogeneous

B. anisotropic

C. malleable

D. ductile

E. isotropic

1618. Sulphur in pig iron tends to make it___________________?
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A. malleable

B. ductile

C. hard

D. tough

E. soft

1619. For the allotropic forms of iron, the points of arrest are __________________?
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A. the points where major changes take place

B. the points where no further change oc-curs

C. the points of discontinuity

D. constant for all metals

E. the points where there is no further flow of metal

1620. Manometer is used to measure__________________?
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A. difference of pressure between two points

B. velocity

C. pressure in pipes, channels etc

D. very low pressure

E. atmospheric pressure

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