metallurgy lab viva voice
DESCRIPTION
METALLURGYTRANSCRIPT
SASTRA UNIVERSITY
SCHOOL OF MECHANICAL ENGINEERING
METALLURGY LAB
DATE -NAME -ROLL NO -CLASS -REG NO -
1) Mild Steel belongs to the following categorya. Low carbon steelb. Medium carbon steelc. High carbon steeld. Alloy steels
2) Which of the following constituent of steels is often softest and least strong
a. Austenite b. Pearlitec. Ferrited. Cementite
3) In grey cast iron, carbon is present in the form of a. Cementiteb. Free carbonc. Flakesd. Spheroids
4) Railway rails are normally made of a. Mild steelb. Alloy steelc. High carbon steeld. Cast iron
5) Melting point of iron is a. 15390Cb. 16010Cc. 14890Cd. 17120C
6) Specimen of Al metal when observed under microscope shows
a. BCCb. FCCc. HCPd. Complex cubic structure
7) Pearlite is a combination ofa. Ferrite and cementite
b. Cementite and ᵞ ironc. Ferrite and austenited. Pearlite and Ferrite
8) A test commonly applied to steel of unknown quality for identification purposes is the
a. Acid – etch testb. Spark testc. Fracture testd. Dye – penetrant test
9) Normalizing operation is carried out ina. Furnaceb. Airc. Waterd. Controlled atmosphere
10) Crystal structure of metals studied bya. Metallography techniquesb. X – ray techniquec. Ultrasonic methodd. Electron microscope
11) The structure which have the highest packing of atoms
a. HCPb. FCCc. BCCd. Simple Cubic
12) Every atom consists of electrons, protons and neutrons except
a. Helium atomb. Boron atomc. Sodium atomd. Ordinary Hydrogen atom
13) Which of the following is closest to the purest form of iron
a. Low carbon steelb. Cast ironc. Wrought irond. High carbon steel
14) What is the microstructure reveals
a. Pearlite b. Ferritec. Martensited. Ledeburite
15) In steel as the percentage of carbon increases which of the following decreases.
a. Ultimate strengthb. Ductilityc. Hardnessd. % of pearlite
16) Which of the following is harder than the diamond?
a. Tantalum carbideb. Alumina ceramicsc. Polycrystalline glassd. None of the above
17) In ductile iron the free carbon is distributed throughout the mass in the form of
a. Needlesb. Flakesc. Nodulesd. Crystals
18) Which of the following has maximum hardnessa. Austeniteb. Pearlitec. Martensited. Troostite
19) Cast iron consists carbona. =2%b. <0.8%c. <2%d. >2%
20) Cementite in white cast iron appears as follows under microscope
a. Darkb. Whitec. Lightd. Finger print
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1 A
2 C
3 C
4 C
5 A
6 B
7 A
8 B
9 B
10 B
11 A, B
12 D
13 C
14 A
15 B
16 D
17 C
18 C
19 D
20 B
1 A
2 C
3 C
4 C
5 A
6 B
7 A
8 B
9 B
10 B
11 A, B
12 D
13 C
14 A
15 B
16 D
17 C
18 C
19 D
20 B
1 A
2 C
3 C
4 C
5 A
6 B
7 A
8 B
9 B
10 B
11 A, B
12 D
13 C
14 A
15 B
16 D
17 C
18 C
19 D
20 B