mechanical engineering MCQs – Page 88

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 Review each marked answer and report any item that may be outdated or unclear.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

1741. Vanadium in high speed steels__________________?
0

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

B. promotes retention of austenite

C. promotes decarburisation

D. increases toughness

E. provides high hot hardness

1742. Admiralty gun metal contains__________________?
0

A. none of the above

B. iron scrap and zinc

C. alloy of tin, lead and cadmium

D. 63 to 67% nickel and 30% copper

E. 88% copper, 10% tin and rest zinc

1743. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm, the pressure at a depth of 50 m below the oil surface will be_________________?
0

A. 6 meters of water Column

B. 3 meters of water column

C. 7 meters of water column

D. 2 meters of water column

E. 5 meters of water column

1744. Induction hardening is the process of_____________________?
0

A. increasing hardness throughout

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

C. hardening core

D. inducing hardness by continuous process

E. heating and cooling rapidly

1745. Uniform flow occurs when ___________________?
0

A. the flow is steady

B. size and cross section change uniformly along length

C. flow occurs at constant fate

D. size and shape of the cross section in a particular length remain constant

E. the flow is streamline

1746. Addition of copper to aluminium results in_____________________?
0

A. improvement of corrosion resistance

B. improving machinability

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

D. none of the above

E. improvement of casting characteristics

1747. Melting point of iron is__________________?
0

A. 1712C

B. 1489C

C. 1131C

D. 1539C

E. 1601C

1748. Which of the following has highest specific strength of all structural materials__________________?
0

A. titanium alloys

B. magnesium alloys

C. chromium alloys

D. none of the above

E. magnetic steel alloys

1749. Ratio of inertia force to surface Jension is known as ___________________?
0

A. Webers number

B. Froude number

C. Reynolds number

D. Mach number

E. none of the above

1750. Metacentric height is the distance between the metacentre and_______________?
0

A. center of gravity

B. center of pressure

C. water surface

D. none of the above

E. center of buoyancy

1751. Depth of hardness of steel is increased by addition of_________________?
0

A. vanadium

B. nickel

C. tungsten

D. ell of the above

E. chromium

1752. The hardness of steel increases if it contains____________________?
0

A. pearlite

B. austenite

C. all of the above

D. cementite

E. martensite

1753. Basic solution is one which has pH value___________________?
0

A. none of the above

B. greater than 7

C. less than 7

D. pH value has nothing to do with basic solution

E. equal to 7

1754. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will_________________?
0

A. increase/decrease depending on depth of immersion

B. decrease

C. increase

D. remain same

E. unpredictable

1755. In mottled cast iron, carbon is available in__________________?
0

A. flat form

B. nodular form

C. partly in free and partly in combined state

D. free form

E. combined form

1756. The atmospheric pressure with rise in altitude decreases__________________?
0

A. unpredictable

B. linearly

C. first slowly and then steeply

D. none of the above

E. first steeply and then gradually

1757. In malleable iron, carbon is present in the form of___________________?
0

A. free carbon

B. flakes

C. cementite

D. spheroids

E. nodular aggregates of graphite

1758. A material is known as allotropic or polymorphic if it __________________?
0

A. has its atoms distributed in a random pattern

B. exists in several crystal forms at different temperatures

C. has a fixed structure under all conditions

D. responds to heat treatment

E. none of the above

1759. An example of amorphous material is____________?
0

A. zinc

B. silver

C. brass

D. glass

E. lead

1760. Sulphur in steel________________?
0

A. reduces the grain size

B. lowers the toughness and transverse ductility

C. acts as deoxidiser

D. decreases tensile strength and hardness

E. increases hardness

Previous Next

Showing 1741 to 1760 of 4266 mcqs