Explore topic-wise MCQs in Mechanical Metallurgy.

This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Metallurgy knowledge and support exam preparation. Choose a topic below to get started.

1.

If the Larsen-Miller parameter is 50*103 at the temperature of 600 degrees. The C1 is equal to 50. Find the fatigue life of the component in hr?

A. 1400 hr
B. 500 hr
C. 1442 hr
D. 54841 hr
Answer» D. 54841 hr
Discussion
2.

The Laser miller parameter is defined as ____________

A. T(ln t+C<sub>1</sub>) = P<sub>1</sub>
B. ln T(ln t+C<sub>1</sub>) = P<sub>1</sub>
C. T(t+C<sub>1</sub>) = P<sub>1</sub>
D. T/t+C<sub>1</sub> = P<sub>1</sub>
Answer» B. ln T(ln t+C<sub>1</sub>) = P<sub>1</sub>
Discussion
3.

The Larser-Miller parameter is used to predict the creep strength and the life of the component in long time by comparing the results obtained at elevated temperature in shorter time.

A. True
B. False
Answer» B. False
Discussion
4.

For a creep strain of 1% in 1000hr, determine the strain rate in sec-1 for the given material?

A. 10<sup>-2</sup> s<sup>-1</sup>
B. 10<sup>-5</sup> s<sup>-1</sup>
C. 2.8*10<sup>-9</sup> s<sup>-1</sup>
D. 10<sup>-9</sup> s<sup>-1</sup>
Answer» D. 10<sup>-9</sup> s<sup>-1</sup>
Discussion
5.

According to Monkman and Grant, the relationship between the minimum creep rate and the rupture time is given as ________ (where the C and K are constant, and the tr is time to rupture and minimum creep rate).

A. t<sub>r</sub> + C = K
B. t<sub>r</sub> + C log = K
C. log t<sub>r</sub> + C log = K
D. t<sub>r</sub> + C = log K
Answer» D. t<sub>r</sub> + C = log K
Discussion
6.

The high-temperature alloys are fabricated by which of the following method?

A. Rolling
B. Forging
C. Precision casting
D. Extrusion
Answer» D. Extrusion
Discussion
7.

Which of the following is not a nickel-based high-temperature application alloy?

A. Astroloy
B. Inconel
C. Udimet
D. Vitallium
Answer» E.
Discussion
8.

The Inconel is an alloy which consists of _____________

A. Cr, Co, Mo
B. Cr, W, Ti
C. Cr, Ni, Fe
D. Ti, Al, Co
Answer» D. Ti, Al, Co
Discussion
9.

Which of the following is not a high-temperature application precipitate?

A. VC
B. TiC
C. Cr<sub>23</sub>C<sub>6</sub>
D. Cu<sub>3</sub>Al
Answer» E.
Discussion
10.

The Suzuki Interaction in the crystal lattice is defined as the interaction between _______

A. dislocations
B. solute atom and dislocation
C. stacking faults
D. grain boundary and solute atom
Answer» D. grain boundary and solute atom
Discussion
11.

Which of the following is preferred as solute for high-temperature application for metals?

A. Interstitial solute with low valance
B. Interstitial solute with high valance
C. Substitutional solute with high valance
D. Substitutional solute with low valance
Answer» D. Substitutional solute with low valance
Discussion
12.

Which of the following strengthening mechanism is most effective in increasing the creep resistance of the material?

A. Precipitation hardening
B. Strain hardening
C. Dispersion strengthening
D. Solid solution strengthening
Answer» D. Solid solution strengthening
Discussion
13.

The metal with ________ stacking fault energy has higher creep resistance.

A. low
B. high
C. average
D. alternate
Answer» B. high
Discussion
14.

The larger grain material will have _________ equicohesive temperature(ECT), while the fine grain material will have ____________ ECT.

A. lower, higher
B. higher, lower
C. lower, lower
D. higher, higher
Answer» C. lower, lower
Discussion
15.

The equicohesive temperature is a material property and always fixed for a given material.

A. True
B. False
Answer» C.
Discussion
16.

The equicohesive temperature is defined as the temperature at which both the grain and grain boundary have the same strength.

A. True
B. False
Answer» B. False
Discussion
17.

As the temperature increases in polycrystalline metal, the nature of fracture change from _____________ to __________

A. intergranular, transgranular
B. transgranular, intergranular
C. tuctile, brittle
D. creep, fatigue
Answer» C. tuctile, brittle
Discussion