Metallurgical Engineering Gate 2019 Questions with Answer

Ques 40 GATE 2019

The critical radius (in nm, rounded off to one decimal place) of nickel nucleus during solidification at 1673 K is _______.
Given: Enthalpy of fusion of nickel = 2.65 × 10⁹ J⋅m⁻³;
Liquid-solid interfacial energy = 0.5 J⋅m⁻²; and Equilibrium melting temperature of nickel = 1728 K.

Ques 41 GATE 2019

A material, made up of alternating layers of metals A and B, is loaded as shown below. If the volume % of B is 25%, the elastic modulus (in GPa, rounded off to one decimal place) of the material is _______.

Ques 42 GATE 2019

The S-N curve for a steel is shown below. If the stress ratio, (σ_min / σ_max) = -0.8, the maximum stress (in MPa, rounded off to the nearest integer) that the steel can withstand for infinite fatigue life is _______.

Ques 43 GATE 2019

If the solid-solid interfacial energy (γ_SS) is 0.87 J⋅m⁻² and solid-liquid interfacial energy (γ_SL) is 0.5 J⋅m⁻², the dihedral angle (φ, in degree, rounded off to one decimal place) during sintering is _______.

Ques 44 GATE 2019

The correct Mohr's circle construction for the stress state given below is _______.

Ques 45 GATE 2019

True stress - true strain behavior of a metal is given by the flow curve equation σ = 1750ε^0.37, where σ is in MPa. The true stress at necking (in MPa, rounded off to the nearest integer) is _______.

Ques 46 GATE 2019

Alligatoring is a defect commonly observed in _______.

Ques 47 GATE 2019

A plate of width 100 cm and thickness 5 cm is rolled to a thickness of 3 cm. If the entry velocity is 10 cm⋅s⁻¹, the exit velocity of the plate (in cm⋅s⁻¹, rounded off to one decimal place) is _______.
Assume no change in the width of the plate.

Ques 48 GATE 2019

The maximum possible reduction (in mm, rounded off to one decimal place) of a 100 mm thick slab during rolling is _______.
Given: The coefficient of friction between roll and the slab is 0.2, and the roll diameter is 200 mm.

Ques 49 GATE 2019

The radius as well as the height of a circular cone increases by 10%. The percentage increase in its volume is _______.
(A) 17.1
(B) 21.0
(C) 33.1
(D) 72.8

Ques 50 GATE 2019

In a country of 1400 million population, 70% own mobile phones. Among the mobile phone owners, only 294 million access the Internet. Among these Internet users, only half buy goods from e-commerce portals. What is the percentage of these buyers in the country?

Ques 51 GATE 2019

Two trains started at 7AM from the same point. The first train travelled north at a speed of 80 km/h and the second train travelled south at a speed of 100 km/h. The time at which they were 540 km apart is _______ AM.

Ques 52 GATE 2019

Liquid steel is kept in a graphite crucible for sufficiently long time such that equilibrium is established. Activity of carbon (with respect to graphite as the standard state) in the liquid is _______.