Questions and answers for exam Preparation

MCQs

Total Questions : 110 | Page 8 of 11 pages

Question 71. Match the defects listed in Group I with the corresponding manufacturing process listed in
Group IIGroup I Group II(P) Orange-peel effect (1) Extrusion(Q) Chevron cracking (2) Deep drawing(R) Flash (3) Arc welding(S) Undercut (4) Forging

P-1, Q-2, R-4, S-3
P-2, Q-3, R-1, S-4
P-3, Q-4, R-2, S-1
P-2, Q-1, R-4, S-3

Discuss Question

Answer: Option D. -> P-2, Q-1, R-4, S-3

-NA-

Question 72. Match the unit operation in Group I with its corresponding principle in Group II:Group I Group II(P) Jigging (1) Modification of surface tension(Q) Tabling (2) Difference in density(R) Heavy media separation (3) Differential initial acceleration(S) Flotation (4) Differential lateral movement

P-3, Q-4, R-2, S-1
P-2, Q-3, R-1, S-4
P-4, Q-2, R-3, S-1
P-1, Q-3, R-2, S-4

Discuss Question

Answer: Option A. -> P-3, Q-4, R-2, S-1

-NA-

Question 73. For the following electrochemical reaction Sn + 2H+ = Sn2+ + H2, if the solution has Sn2+ concentration 10-2 M and pH 5 at 298 K, which of the following is true?
Given: standard reduction potential for Sn2+ + 2e- --> Sn is -0.136 V versus SHE; pH2 = 1 atm

Sn undergoes oxidation
H+ undergoes reduction
Sn2+ undergoes reduction
No net reaction

Discuss Question

Answer: Option C. -> Sn2+ undergoes reduction

-NA-

Question 74. Match the powder production technique given in Group I with the corresponding shape listed in
Group IIGroup I Group II(P) Reduction (1) Flaky(Q) Gas Atomization (2) Spongy(R) Milling (3) Dendritic(S) Electrolysis (4) Spherical

P-2, Q-4, R-1, S-3
P-1, Q-3, R-2, S-4
P-2, Q-3, R-4, S-1
P-3, Q-2, R-1, S-4

Discuss Question

Answer: Option A. -> P-2, Q-4, R-1, S-3

-NA-

Question 75. The critical internal crack length (in mm) in a steel having KIc of 45 MPa√m to support a Mode-I stress of 400 MPa is __________

7.9 to 8.3
5.4 to 5.8
2.9 to 3.3
7.3 to 7.7

Discuss Question

Answer: Option A. -> 7.9 to 8.3

-NA-

Question 76. Determine the correctness or otherwise of the following Assertion (a) and Reason (r). Assertion: For the extraction of metal values from their sulphide concentrates by
hydrometallurgical route, leaching with oxygen under high pressure is used. Reason: Presence of oxygen under high pressure causes roasting of sulphides, which helps in
leaching of the values.

a
a
both a
both a

Discuss Question

Answer: Option C. -> both a

-NA-

Question 77. Applying the secant method, the first approximation to the root of f(x) = 1 + ln x + x/2, starting with function values at x = 0.3 and x = 0.4, is_______