mechanical engineering MCQs – Page 136

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 Review each marked answer and report any item that may be outdated or unclear.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

2701. Which of the following represents the allotropic forms of iron__________________?
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A. alpha iron, gamma from and delta iron

B. alpha iron and beta iron

C. alpha iron, beta iron and gamma iron

D. body centred cubic a-iron and face centred cubic a-iron

E. none of the above

2702. In malleable iron, carbon is present in the form of___________________?
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A. free carbon

B. nodular aggregates of graphite

C. flakes

D. spheroids

E. cementite

2703. Sulphur in steel________________?
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A. reduces the grain size

B. acts as deoxidiser

C. decreases tensile strength and hardness

D. increases hardness

E. lowers the toughness and transverse ductility

2704. Pick up wrong statement about wrought iron ?
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A. It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

B. It can be easily forge welded

C. It is very soft and ductile

D. It melts at 1535C

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

2705. German silver contains_________________?
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A. 1% silver

B. 2.5% silver

C. 10% silver

D. 5% silver

E. 100% silver

2706. Which of the following is the binding material in cemented carbides___________________?
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A. nickel

B. cobalt

C. vanadium

D. iron

E. carbon

2707. Gamma iron exits at following temperature___________________?
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A. near melting point

B. room temperature

C. between 1400C and 1539C

D. none of the above

E. between 910C and 1400C

2708. An example of amorphous material is____________?
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A. silver

B. zinc

C. brass

D. lead

E. glass

2709. Connecting rod is usually made of_________________?
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A. cast iron

B. low carbon steel

C. medium carbon steel

D. aluminium

E. high carbon steel

2710. Taps, dies and drills contain carbon________________?
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A. below 1%

B. below 0.5%

C. above 1%

D. nil

E. above 2.2%

2711. Induction hardening is the process of_____________________?
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A. increasing hardness throughout

B. hardening surface of workpiece to ob-tain hard and wear resistant surface

C. heating and cooling rapidly

D. hardening core

E. inducing hardness by continuous process

2712. Cyaniding is the process of________________?
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A. dipping steel in cyanide bath

B. reacting steel surface with cyanide salts

C. adding carbon and nitrogen by heat treatment of steel to increase its surface hardness

D. making corrosion resistant steel

E. obtaining cyanide salts

2713. Steel made from phosphatic iron is_________________?
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A. ductile

B. malleable

C. hard

D. tough

E. brittle

2714. The basic constituents of Hastelloy are_________________?
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A. all of the above

B. aluminium, copper etc

C. none of the above

D. nickel, molybdenum etc

E. nickel, copper, etc

2715. Following elements have face-centred cubic structure__________________?
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A. a iron (below 910C and between 1400 to 1539C), W

B. all of the above

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

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

E. none of the above

2716. Compressive strength of grey cast iron in tonnes/cm is of the order of___________________?
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A. 15-22

B. 15-Oct

C. 5-7

D. 10-Jul

E. 5-Mar

2717. The most effective inhibitor of grain growth, when added in small quantities is__________________?
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A. manganese

B. vanadium

C. cobalt

D. carbon

E. copper

2718. Dow metal contains____________________?
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A. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

B. 90% magnesium and 10% tin

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

D. 90% aluminium and 90% copper

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

2719. 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

2720. High carbon steel carries carbon %age c_________________?
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A. 1.5 to 2.5%.

B. 0.6 to 0.8%

C. 0.1 to 0.3%

D. 0.8 to 1.5%

E. 0.3 to 0.6%

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