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Q1. Which of the following strengthening mechanisms is/are used to attain high-temperature strength?

(a) Solid-solution strengthening
(b) Precipitation hardening
(c) Dispersion hardening
(d) Solid-solution strengthening, precipitation hardening or dispersion hardening

Q2. Which of the following is/are the adequate high-temperature mechanical properties to avoid fracture?

(a) Low creep rate and high stress-rupture strength
(b) High stress-rupture strength, low creep rate, and high fracture toughness
(c) High stress-rupture strength and high fracture toughness
(d) Low creep rate and high fracture toughness

Q3. Which of the following is/are true regarding stress rupture?

(a) The stress required to cause a rupture in a predetermined time at a constant temperature
(b) It is important in short-term high-temperature applications
(c) Stress rupture is an important mechanical property for gas turbine or rocket engines
(d) The stress required to cause a rupture in short-term high-temperature applications at a predetermined time is known as stress rupture and it is an important mechanical property for gas turbines and rocket engines

Q4. Which of the following is/are correct regarding creep?

(a) It is the continuous plastic elongation of metal under constant load
(b) It is the high-temperature mechanical effect of a metal
(c) It is the continuous plastic elongation of metal under constant load at high temperature and it can be minimized by the fraction of grain boundaries
(d) It can be minimized by reducing the fraction of grain boundaries

Q5. Which of the following mechanical properties is/are important in structural applications of metals?

(a) Tensile strength
(b) Yield strength
(c) Ductility and Elasticity
(d) Tensile strength, Yield strength, Ductility, and Fracture toughness

Q6. Dilute alloying elements of base metals exhibiting a relatively high solubility and diffusivity for atomic oxygen are subject to internal corrosion.

(a) True
(b) False
(c) -
(d) -

Q7. Which of the following is/are true regarding internal corrosion?

(a) Corrosion products precipitate in the metal matrix
(b) Corrosion products precipitate in the metal matrix and metals such as Fe, Ni, and Co are highly prone to internal corrosion
(c) Corrosion occurs on external surfaces of metals
(d) It is due to the stable corrosion products of base metals

Q8. Which of the following metals results in the formation of volatile oxides?

(a) Molybdenum
(b) Tungsten
(c) Osmium, tungsten, molybdenum, and Vanadium
(d) Vanadium

Q9. Which of the following metals results in the ignition in extreme cases?

(a) Sodium
(b) Magnesium
(c) Niobium
(d) Sodium, magnesium, and niobium

Q10. Metals that follow linear oxidation kinetics at low temperatures tend to oxidize catastrophicallyat high temperatures.

(a) True
(b) False
(c) -
(d) -


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