Manufacturing Techniques Lab Pre And Post Lab , MCQ Questions And Answers

 

Pre Lab - 8

Q.1 Which of the following is the hardest constituent of steel?

(A)  Ledeburite

(B)  Austenite

(C)  Bainite

(D)  Martensite

Correct Answer is D

Q.2 Iron prossesses BCC crystal structure above (in degree centigrade)?

(A)  1539

(B)   768

(C)   910

(D)   1410

Correct Answer is D

Q.3 Which of the following form of iron is magnetic in nature?

(A)    α

(B)   δ

(C)   γ

(D)   λ

Correct Answer is A

Q.4 For steel, which of the following properties can be enhanced upon annealing?

(a)  Hardness

(b) Toughness

(c) Ductility

(d) Resilience

(A)  a

(B)  b 

(C)  c

(D)  d 

Correct Answer is C

Q.5 Which of the following alloying element can be used to deoxidize steels?

(a) Phosphorous

(b) Carbon

(c) Cerium

(d) Selenium

(A)  a

(B)  b

(C)  c

(D)  d

Correct Answer is C

Post Lab - 8 

Q.1 Which of the following processes will one use on hardened steel to reduce brittleness?

a) Annealing
b) Normalizing
c) Spheroidizing
d) Tempering

(A)  a

(B)  b

(C)  c

(D)  d

Correct Answer is D 

Q.2 Which of the following material in the final structure of steel increases the strength of steel?

a) Martensite
b) Pearlite
c) Ledeburite
d) Austenite

(A)  a 

(B)  b

(C)  c

(D)  d

Correct Answer is (A)

Q.3 Which of the following is defined as the ability of the structure to transform into martensite?

a) Hardenability
b) Strength
c) Toughness
d) Hardness

(A)  a 

(B)  b

(C)  c

(D)  d

Correct Answer is (A)

Q.4 Which of the following has the highest hardness number?

a) Martensite
b) Tempered martensite
c) Pearlite
d) Fine pearlite

(A)  a 

(B)  b

(C)  c 

(D)  d

Correct Answer is (A)

Q.5 In a hardnability curve which of the following is true:

a) Hardness increases as distance from quenched end increases
b) Hardness decreases as distance from quenched end increases
c) Hardness increases as martensite decreases
d) Hardenability curve is a straight line

(A)  a 

(B)  b 

(C)  c

(D)  d

Correct Answer is (B)

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