mechanical engineering MCQs – Page 133

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 Review each marked answer and report any item that may be outdated or unclear.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

2641. Carbon in iron is an example of__________________?
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A. interstitial solid solution

B. none of the above.

C. substitutional solution

D. intermetallic compounds

E. all of the above

2642. Super conduction by metals is observed in the temperature range of_________________?
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A. below 10K

B. above 100K

C. above 1000C

D. around 0C

E. around 100C

2643. Materials after cold working are subjected to following process to relieve stresses__________________?
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A. annealing

B. hot working

C. tempering

D. normalising

E. special heat treatment

2644. DuraJomin contains___________________?
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A. 90% magnesium and 9% aluminium with some copper

B. 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg

C. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

D. 10% aluminium and 90% copper

E. 94% aluminium and 6% tin

2645. Iron is ____________________?
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A. ferroelectric

B. dielectric

C. paramagnetic

D. none of the above

E. ferromagnetic

2646. The elastic stress strain behaviour of rubber is_____________________?
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A. no fixed relationship

B. non-linear

C. linear

D. unpredictable behaviour

E. plastic

2647. White metal contains__________________?
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A. alloy of tin, lead and cadmium

B. malleable cast iron and silver

C. silver and chromium

D. 88% copper and 10% tin and rest zinc

E. 63 to 67% nickel and 30% copper

2648. The following types of materials are usually the most ductile__________________?
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A. face-centred cubic lattice

B. hexagonal close-packed lattice

C. none of the above

D. all of the above

E. body-centred cubic lattice

2649. The following element cant impart high strength at elevated temperature__________________?
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A. silicon

B. nickel

C. none of the above

D. magnesium

E. manganese

2650. Delta metal is an alloy of__________________?
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A. iron, lead and tin

B. iron, nickel and copper

C. iron, aluminium and magnesium

D. copper, zinc and antimony

E. copper, zinc and iron

2651. Slow plastic defomiation of metals under a constant stress is known as________________?
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A. creep

B. endurance

C. non-plastic deformation

D. plastic deformation

E. fatigue

2652. Cold rolled steel sheets contain carbon of the following order___________________?
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A. 0.20%

B. 0.60%

C. 0.80%

D. 0.1%

E. 0.40%

2653. Which of the following is used for bearing liner_______________?
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A. gun metal

B. bell metal

C. bronze

D. babbit metal

E. brass

2654. Depth of hardness of steel is increased by addition of_________________?
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A. chromium

B. ell of the above

C. nickel

D. tungsten

E. vanadium

2655. Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio _____________________?
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A. 50 : 20 : 10 : 20

B. 40 : 30 : 20 : 10

C. 50 : 10 : 20 : 20

D. 30 : 20 : 30 : 20

E. 50 : 20 : 20 : 10

2656. Foundry crucible is made of_________________?
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A. mild steel

B. graphite

C. cast iron

D. lead

E. german silver

2657. Argentite is the principal ore or raw material for _________________?
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A. silver

B. tin

C. aluminium

D. zinc

E. lead

2658. Neutral solution is one which has pH value__________________?
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A. none of the above

B. greater than 7

C. pH value has nothing to do with neutral solution

D. less than 7

E. equal to 7

2659. Pick up the wrong statement?
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A. manganese in steel induces hardness

B. nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility

C. sulphur, phosphorous and lead improve machining properties of steel

D. tungsten in steels improves magnetic properties and hardenability

E. aluminium in steel results in excessive grain growth

2660. Nickel in steel___________________?
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A. improves wear resistance, cutting ability and toughness

B. improves cutting ability and reduces hardenability

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

D. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

E. none of the above

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