mechanical engineering MCQs – Page 86

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 Review each marked answer and report any item that may be outdated or unclear.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

1701. Which of the following is not the correct method of increasing fatigue limit __________________?
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A. shot peening

B. nitriding of surface

C. under-stressing

D. cold working

E. surface decarburisation

1702. The rise or depression of liquid in a tube due to surface tensionwim increase in size of tube will________________?
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A. decrease

B. may increase or decrease depending on the characteristics of liquid

C. unpredictable

D. increase

E. remain unaffected

1703. Machining properties of steel are improved by adding___________________?
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A. silicon, aluminium, titanium

B. vanadium, aluminium

C. chromium, nickel

D. sulphur, lead, phosphorous

E. lubricants

1704. The property by virtue of which a liquid opposes relative motion between its different layers is called_________________?
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A. surface tension

B. viscosity

C. cohesion

D. osmosis

E. co-efficient of viscosity

1705. Recrystallization temperature is one________________?
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A. at which crystals are destroyed on heating

B. at which crystals first start forming from molten metal when it is cooled

C. at which crystals grow bigger in size

D. at which change of allotropic form takes place

E. at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

1706. In which of the following cases, consideration of creep is important_________________?
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A. cast iron pipes

B. piston I.C. engine

C. cycle chains

D. gas turbine blades

E. flywheel of steam engine

1707. Monel metal contains_________________?
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A. 63 to 67% nickel and 30% copper

B. alloy of tin, lead and cadmium

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

D. none of the above

E. malleable iron and zinc

1708. The elastic stress strain behaviour of rubber is_____________________?
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A. no fixed relationship

B. unpredictable behaviour

C. linear

D. non-linear

E. plastic

1709. Carbon steel is_______________?
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A. made by adding carbon in steel

B. extensively used for making cutting tools

C. refined from cast iron

D. extremely brittle

E. an alloy of iron and carbon with varying quantities of phosphorus and sulphur

1710. Delta metal is an alloy of__________________?
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A. iron, nickel and copper

B. iron, aluminium and magnesium

C. iron, lead and tin

D. copper, zinc and antimony

E. copper, zinc and iron

1711. The basic constituents of Hastelloy are_________________?
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A. nickel, molybdenum etc

B. nickel, copper, etc

C. all of the above

D. aluminium, copper etc

E. none of the above

1712. Basic constituents of Monel metal are _________________?
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A. zinc, tin, lead

B. none of the above

C. nickel, molybdenum

D. nickel, lead and tin

E. nickel, copper

1713. Cyaniding is the process of________________?
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A. obtaining cyanide salts

B. dipping steel in cyanide bath

C. making corrosion resistant steel

D. reacting steel surface with cyanide salts

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

1714. The machinability of steel is increased by___________________?
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A. silicon and sulphur

B. sulphur, graphite and aluminium

C. phosphorous and aluminium

D. phosphorous, lead and sulphur

E. none of the above

1715. The correct composition of Babbit metal is__________________?
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A. 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi

B. 87% Sn, 4% Cu, 8% Sb, 1% Al

C. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg

D. none of the above

E. 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

1716. Which is the false statement about wrought iron. It has________________?
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A. high resistance to rusting and corrosion

B. easily weldable characteristics

C. ability of hold protective coating

D. uniform strength in all directions

E. high ductility

1717. Hardness of steel depends on_________________?
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A. the shape and distribution of the car-bides in iron

B. contents of alloying elements

C. amount of carbon it contains

D. the quality of ore from which it is made

E. method of fabrication

1718. Kinematic viscosity is dependent upon__________________?
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A. distance

B. pressure

C. level

D. flow

E. density

1719. Chilled cast iron has____________________?
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A. a low percentage of graphite

B. graphite as its basic constituent of composition

C. none of the above is true

D. a very high percentage of graphite

E. no graphite

1720. Which of the following alloys does not contain tin_________________?
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A. gun metal

B. white metal

C. solder admiralty

D. fusible metal

E. phosphor bronze

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