GATE CH 2022 Paper 1 — page 14

Questions 40–42 of 65. Imported answers require review unless explicitly marked reviewed.

Consider a bare long copper wire of 1 mm diameter. Its surface temperature is

and the ambient temperature is

(

). The wire is to be coated with a 2 mm thick insulation. The convective heat transfer coefficient is 20 W m

. Assume that

and

remain unchanged. To reduce heat loss from the wire, the maximum allowed thermal conductivity of the insulating material, in W m

, rounded off to two decimal places, is

Your answerChoose one option.

0.02

0.04

0.10

0.01

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Two large parallel plane walls are maintained at 1000 K and 500 K. Parallel radiation shields are to be installed between the two walls. Assume that the emissivities of the walls and the shields are equal. If the melting temperature of the shields is 900 K, the maximum number of shield(s) that can be installed between the walls is (are)

Your answerChoose one option.

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Saturated steam condenses on a vertical plate maintained at a constant wall temperature. If

is the vertical distance from the top edge of the plate, then the local heat transfer coefficient

, where

is the local mass flow rate of the condensate per unit plate width. The ratio of the average heat transfer coefficient over the entire plate to the heat transfer coefficient at the bottom of the plate is

Your answerChoose one option.

4/3

3/4

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2022 · Paper 1

Question 40

Question 41

Question 42