GATE MT format:nat PYQs & Answers — Page 7

Questions 61–70 of 232. Imported answers require independent review unless marked reviewed.

Topic practice 232 questionsPage 7 of 24

A non-porous spherical Fe

particle of initial radius of

is topochemically reduced by H

, where the reactant-product interface is sharp and spherical, and reaction rate is proportional to the interfacial area. The radius of the unreacted Fe

particle after 600

will be ______

. (Round off to the nearest integer).

Given: Rate constant

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A long metallic cylindrical rod of radius

, length

(

) and electrical resistivity

is kept in vacuum and is carrying an electric current of

. The only way it loses heat to the ambient is via radiation. If the ambient temperature is

, then the steady-state temperature of the rod is ________

. (Round off to the nearest integer).

Given: Stefan-Boltzmann constant =

Neglect the heat loss by the two flat ends of the rod and assume emissivity = 1.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

100

of sphalerite concentrate containing 60% ZnS is COMPLETELY roasted with stoichiometric amount of pure oxygen. The amount of oxygen required is _____

. (Round off to one decimal place).

Assume that the other components in the concentrate are not reactive.

Given: Atomic weight values (in

) for Zn = 65, S = 32, O = 16.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

of A-B alloy containing 20 wt.% B is held at temperature

. The weight of B dissolved in

at that temperature is ________

. (Round off to the nearest integer).

Diagram for Metallurgical Engineering question 61

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A mild steel pipeline is connected to zinc for cathodic protection at a current density of 10

. The quantity of zinc required per square meter of the pipeline per year is ________

. (Round off to the nearest integer).

Given: Atomic weight of Zn is 65

Faraday’s constant

(of electrons)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A large rectangular component is undergoing fully-reversed cyclic loading, and the component is known to grow the dominant fatigue crack from the outer surface. If the stress amplitude (

) is 100

and the critical stress intensity factor

of the material is 50

then the crack length at which the component will fail catastrophically is _____

. (Round off to one decimal place)

Given: The geometric factor

for this loading condition is 1.12.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In casting, for a simple vertical gating system with a gate of cross-sectional area 2

and sprue height of 10

, the filling time for a mould of dimensions 40

, is ________

. (Round off to one decimal place)

Given: Acceleration due to gravity

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

During arc welding, the actual heat input is 200

and the current and voltage are 200 A and 20 V, respectively. For a weld cross-sectional area of 2

and heat transfer efficiency of 0.9, the velocity of welding is ________

. (Round off to the nearest integer).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The sum of eigen values of the matrix

is __________ (in integer).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The probability of setting an easy exam paper by three setters are

, and

. If all three are setting one paper each, then the probability that at least one of the papers will be easy is __________ (round off to 2 decimal places).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE MT format:nat PYQs

Question 58

Question 59

Question 60

Question 61

Question 62

Question 63

Question 64

Question 65

Question 30

Question 31