mechanical engineering MCQs – Page 87

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 Review each marked answer and report any item that may be outdated or unclear.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

1721. Foundry crucible is made of_________________?
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A. german silver

B. mild steel

C. cast iron

D. graphite

E. lead

1722. Balls for ball bearings are made of_________________?
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A. stainless steel

B. carbon-chrome steel

C. cast iron

D. high carbon steel

E. mild steel

1723. Iron is ____________________?
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A. paramagnetic

B. ferroelectric

C. none of the above

D. dielectric

E. ferromagnetic

1724. Gamma iron exits at following temperature___________________?
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A. room temperature

B. near melting point

C. none of the above

D. between 910C and 1400C

E. between 1400C and 1539C

1725. The following element cant impart high strength at elevated temperature__________________?
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A. none of the above

B. magnesium

C. nickel

D. silicon

E. manganese

1726. An important property of malleable cast iron in comparison to grey cast iron is the high___________________?
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A. compressive strength

B. carbon content

C. ductility

D. surface finish

E. hardness

1727. In nodular iron, graphite is in the form of_____________________?
0

A. spheroids

B. nodular aggregates of graphite

C. flakes

D. free carbon

E. cementite

1728. Which is false statement about case hardening. Case hardening is done by_______________?
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A. induction hardening

B. electroplating

C. flame hardening

D. cyaniding

E. nitriding

1729. The metallic structure of mild steel is_________________?
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A. cubic structure

B. hexagonal close packed

C. body centred cubic

D. orthorhombic crystal

E. face centred cubic

1730. Process of austempering results in__________________?
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A. relieving of stresses throughout a component

B. martenistic structure

C. carburised structure

D. formation of bainite structure

E. lamellar layers of carbide distributed throughout the structure

1731. The bulk modulus of elasticity with increase in pressure__________________?
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A. remains constant

B. decreases

C. increases

D. increases first up to certain limit and then decreases

E. unpredictable

1732. Points of arrest for iron correspond to__________________?
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A. stages at which further heating does not increase temperature for some time

B. stages at which allotropic forms change

C. stages at which properties do not change with increase in temperature

D. there is nothing like points of arrest

E. none of the above

1733. Phosphor bronze contains____________________?
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A. 1% phosphorous

B. none of the above

C. 0.5% of phosphorous

D. 5% phosphorous

E. 2.5% phosphorous

1734. Connecting rod is usually made of_________________?
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A. low carbon steel

B. cast iron

C. medium carbon steel

D. high carbon steel

E. aluminium

1735. A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as_________________?
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A. precipitation

B. heat treatment

C. austempering

D. allotropic change

E. recrystallisation

1736. German silver is an alloy of___________________?
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A. silver and gold

B. silver and some impurities

C. refined silver

D. nickel and copper

E. nickel, copper and zinc

1737. Slow plastic defomiation of metals under a constant stress is known as________________?
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A. non-plastic deformation

B. creep

C. plastic deformation

D. endurance

E. fatigue

1738. The molecules in a solid move______________?
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A. do not move

B. in circular motion

C. back and forth like tiny pendulums

D. in a haphazard way

E. in a random manner

1739. The crystal of alpha iron is ____________________?
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A. face centred cubic

B. hexagonal close packed

C. body centred cubic

D. cubic structure

E. orthorhombic crystal

1740. Brass contains___________________?
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A. 85-92% copper and rest tin with little lead and nickel

B. 70% copper and 30% zinc

C. 70% copper and 30% tin

D. 90% copper and 10% tin

E. 70-75% copper and rest tin

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