Engineering Material Online Model Quiz questions and answers paper2

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1. Sulphur in steel
acts as deoxidiser	reduces the grain size
decreases tensile strength and hardness	lowers the toughness and transverse ductility

2. Tungsten in steel _____.
improves wear resistance, cutting ability and toughness	refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
improves cutting ability and reduces hardenability	gives ductility, toughness, tensile strength and anticorrosion properties

3. Tungsten in high speed steel provides
hot hardness	toughness
wear resistance	sharp cutting edge

4. Which of the following is not the correct method of increasing fatigue limit
shot peening	nitriding of surface
cold working	surface decarburisation

5. Connecting rod is usually made of ______.
aluminium	low carbon steel
medium carbon steel	high carbon steel

6. Which of lh6 following pipes is least corrosion resistant
brass	mild steel
cast iron	wrought iron

7. Tensile strength of steel can be safely increased by
adding carbon upto 2.8%	adding carbon upto 6.3%
adding carbon upto 0.83%	adding small quantities of copper

8. High carbon steel carries carbon %age c
0.1 to 0.3%	0.3 to 0.6%
0.6 to 0.8%	0.8 to 1.5%

9. Cobalt in steel
improves wear resistance, cuttin ability and toughness	refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties
improves cutting ability and reduce hardenability	gives ductility, toughness, tensil strength and anticorrosion propertie

10. The percentage of carbon in low carbon steel is ______.
0.05%	0.15%
0.3%	0.5%

11. The hardness of steel increases if it contains
austenite	martensite
pearlite	cementite

12. Nodular iron has _______.
high maehinability	low melting point
high tensile strength	good fluidity

13. Nickel in steel
improves wear resistance, cutting ability and toughness	refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
improves cutting ability and reduces hardenability	gives ductility, toughness, tensile strength and anticorrosion properties

14. Which of the following elements does not impart hardness to steel _____.
copper	chromium
nickel	silicon

15. The presence of sulphur in pig iron makes
it easily machinable	it brittle
it hard	the casting unsound

16. Melting point of iron is ______.
1539°C	1601°C
1489°C	1712°C

17. Compressive strength of grey cast iron in tonnes/cm is of the order of _______.
3-5	5-7
7-10	10-15

18. Blast furnace produces following by reduction of iron ore
cast iron	pig iron
wrought iron	malleable iron

19. Cupola produces following material _____.
cast iron	pig iron
wrought iron	malleable iron

20. The machinability of steel is increased by _____.
silicon and sulphur	phosphorous, lead and sulphur
sulphur, graphite and aluminium	phosphorous and aluminium