GATE MT year:2020 PYQs & Answers — Page 7

Questions 61–65 of 65. Imported answers require independent review unless marked reviewed.

Topic practice 65 questionsPage 7 of 7

The steady state creep rate of a material increases by a factor of 20 when the temperature is increased from 890 K to 980 K. The creep rate at a temperature of ______ K (round off to the nearest integer) will be 5 times the creep rate at 890 K.

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Crack growth is being continuously measured in a test specimen subjected to constant amplitude cyclic stress with a mean stress of zero. The crack growth rate is related to the stress intensity range, ΔK as

where, a is the crack length and N is the number of cycles. When the crack length increases by a factor of two, the crack growth rate will increase by a factor of ______ (round off to one decimal place).

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In a top gated mold, liquid metal enters the mold cavity as a freely falling stream under gravity from a height of 0.5 m. Ignore the fluid friction due to viscosity and the drag due to changes in the direction of flow. If the volume of the mold cavity is 10 m

, then the time required to fill the mold is ______ s (round off to nearest integer).

Given:

Acceleration due to gravity is 9.8 m s

Cross-sectional area of gate is 0.2 m

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A Basic Oxygen Furnace operator, at the end of oxygen blow, measures the dissolved oxygen content in the steel as 0.03 wt.% and the steel temperature as 1800 K. The carbon content [C] in the steel is ______ wt.% (round off to two decimal places).

Assume:

Equilibrium between dissolved carbon [C], dissolved oxygen [O], and CO (gas) at 1 atmosphere.

Henry’s law is valid for both [C] and [O]

Given: [ C ]

+ [ O ]

→ (CO)

R = 8.314 J·mol

·K

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M and N are

matrices. If the det(M) is −9 and the det(N) is −14, then the det(NM) is ______ (round off to the nearest integer).

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GATE MT year:2020 PYQs

Question 51

Question 52

Question 53

Question 54

Question 55