mechanical engineering MCQs – Page 130

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 Review each marked answer and report any item that may be outdated or unclear.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

2581. An important property of high silicon (12 18%) cast iron is the high__________________?
0

A. brittleness

B. corrosion resistance

C. plasticity

D. tenacity

E. hardness

2582. Age-hardening is related with______________?
0

A. german silver

B. duralumin

C. gun metal

D. cast iron

E. stainless steel

2583. The hardness of steel primarily depends on _____________________?
0

A. shape of carbides and their distribution in iron

B. heat treatment employed

C. method of manufacture

D. %age of alloying elements

E. %age of carbon

2584. Hardness of upper bainite (acicular structure) is about___________________?
0

A. RC 48

B. RC 32.

C. RC 65

D. RC 57

E. RC 80

2585. Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is__________________?
0

A. invar

B. duralumin

C. silver metal

D. monel metal

E. Hastelloy

2586. Amorphous material is one___________________?
0

A. in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

B. none of the above

C. in which atoms align themselves in a geometric pattern upon solidification

D. which emits fumes on melting

E. which is not attacked by phosphorous

2587. Which is false statement about properties of aluminium ___________________?
0

A. corrosion resistance is good

B. fatigue strength is not high

C. modulus of elasticity is fairly low

D. wear resistance is very good

E. creep strength limits its use to fairly low temperatures

2588. Basic solution is one which has pH value___________________?
0

A. equal to 7

B. pH value has nothing to do with basic solution

C. less than 7

D. greater than 7

E. none of the above

2589. The alloy used for making electrical resistances and heating elements is____________________?
0

A. magnin

B. peiminvar

C. nichrome

D. elinvar

E. invar

2590. The percentage of carbon in pig iron varies from___________________?
0

A. 0.1 to 1.2%

B. 4 to 4.5%

C. 4.5 to 6.3%.

D. 2.5 to 4%

E. 1.5 to 2.5%

2591. Pick up the wrong statement Nickel and chromium in steel help in _________________?
0

A. providing high strength at elevated temperatures

B. improving machining properties

C. raising the elastic limit

D. improving the resilience and ductility

E. providing corrosion resistance

2592. Vanadium in high speed steels__________________?
0

A. forms very hard carbides and thus in-creases wear resistance

B. provides high hot hardness

C. promotes decarburisation

D. promotes retention of austenite

E. increases toughness

2593. White cast iron contains carbon in the form of__________________?
0

A. cementite

B. graphite

C. free carbon

D. white carbon

E. ferrite

2594. A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as_________________?
0

A. precipitation

B. allotropic change

C. recrystallisation

D. heat treatment

E. austempering

2595. By severely deforming a metal in a particular direction it becomes _________________?
0

A. homogeneous

B. ductile

C. malleable

D. anisotropic

E. isotropic

2596. Recrystallisation temperature can belowered by_________________?
0

A. all of the above

B. grain refinement

C. none of the above

D. purification of metal

E. working at lower temperature

2597. Lead is poured into the joint between two pipes. These pipes may be made of____________________?
0

A. asbestos cement

B. concrete

C. vitrified clay

D. mild steel

E. cast iron

2598. The percentage of carbon in low carbon steel is__________________?
0

A. 0.15%

B. 0.7%.

C. 0.05%

D. 0.30%

E. 0.50%

2599. Babbit metal is a_________________?
0

A. A. and C. above

B. tin base alloy

C. lead base alloy

D. copper base alloy

E. all of the above

2600. Wrought iron is________________?
0

A. least resistant to corrosion

B. high in strength

C. heat treated to change its properties

D. highly resistant to corrosion

E. hard

Previous Next

Showing 2581 to 2600 of 4266 mcqs