mechanical engineering MCQs – Page 83

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 Review each marked answer and report any item that may be outdated or unclear.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

1641. Following elements have face-centred cubic structure__________________?
0

A. a iron (below 910C and between 1400 to 1539C), W

B. none of the above

C. Mg, Zn, Ti, Zr, Br, Cd

D. all of the above

E. gamma iron (910 to 1400C), Cu, Ag, Au, Al, Ni, Pb, Pt

1642. Which of the following is the binding material in cemented carbides___________________?
0

A. carbon

B. vanadium

C. cobalt

D. nickel

E. iron

1643. The crystal structure of brass is_________________?
0

A. H.C.P.

B. F.C.C.

C. none of the above

D. B.C.C.

E. Orthorhombic crystalline structure

1644. Kinematic viscosity is equal to_________________?
0

A. dynamicviscosity x density

B. density/dynamic viscosity

C. dynamic viscosity/density

D. 1/dynamicviscosity x density

E. same as dynamic viscosity

1645. Cupola produces following material__________________?
0

A. malleable iron

B. pig iron

C. wrought iron

D. cast iron

E. white iron

1646. A specimen of aluminium metal when observed under microscope shows __________________?
0

A. F.C.C. crystal structure

B. orthorhombic crystalline structure

C. a complex cubic structure

D. B.C.C. crystalline structure

E. H.C.P. structure

1647. Gun metal contains__________________?
0

A. 90% copper and 10% tin

B. 85-92% copper and rest zinc

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

D. 70-78% copper and rest tin

E. 70% copper and 30% zinc

1648. A metal with specific gravity of o floating in a fluid of same specific gravity a will____________________?
0

A. be fully immersed with top surface at fluid surface

B. none of the above

C. sink to bottom

D. partly immersed

E. float over fluid

1649. Aluminium bronze contains__________________?
0

A. 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

B. 10% aluminium and 90% tin

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

D. 90% magnesium and 9% aluminium with some copper

E. 10% aluminium and 90% copper

1650. Solder is an alloy consisting of________________?
0

A. tin and copper

B. lead and copper

C. tin, antimony, copper

D. lead and zinc

E. tin and lead

1651. The presence of sulphur in pig iron makes__________________?
0

A. it hard

B. increases the fluidity

C. it brittle

D. it easily machinable

E. the casting unsound

1652. To avoid an interruption in the flow of a syphon, an air vessel is provided__________________?
0

A. at the inlet

B. at the outlet

C. none of the above

D. ay nay point between inlet and outlet

E. at the summit

1653. Ferromagnetic alpha iron exists in temperature range of________________?
0

A. 770 910C

B. below 723C

C. 910-1440C

D. above 1539C

E. 1400-1539C

1654. Lead is poured into the joint between two pipes. These pipes may be made of____________________?
0

A. concrete

B. asbestos cement

C. vitrified clay

D. cast iron

E. mild steel

1655. The hardness of steel primarily depends on _____________________?
0

A. method of manufacture

B. %age of carbon

C. %age of alloying elements

D. shape of carbides and their distribution in iron

E. heat treatment employed

1656. Pick up wrong statement about wrought iron ?
0

A. It melts at 1535C

B. It contains carbon of the order of 0 to 0.25%

C. It can be easily forge welded

D. It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

E. It is very soft and ductile

1657. Addition of manganese to aluminium results in__________________?
0

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

B. improvement of corrosion resistance

C. improving machinability

D. improvement of casting characteristics

E. none of the above

1658. Ductility of a material can be defined as__________________?
0

A. ability to undergo large permanent deformations in compression

B. all of the above

C. ability to recover its original form

D. none of the above

E. ability to undergo large permanent deformations in tension

1659. Cast iron is characterised by minimum of following %age of carbon_________________?
0

A. 0.80%

B. 2%

C. 6.3%.

D. 1.30%

E. 0.20%

1660. Which is false statement about annealing. Annealing is done to________________?
0

A. soften material

B. relieve stresses

C. permit further cold working

D. harden steel slightly

E. improve machining characteristic

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