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GATE ME: Heat Transfer Champion Quiz 2

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Question 1

A fin is a surface that extends from an object to increase the rate of heat transfer to or from the environment by:

Question 2

Biot number signifies the ratio of

Question 3

One dimensional unsteady state heat transfer equation for a sphere with heat generation at the rate of ‘q’ can be written as

Question 4

Unsteady heat conduction refers to:

Question 5

Lumped Heat-transfer analysis of a solid object suddenly exposed to a fluid medium at a different temperature is valid when _________.

Question 6

A cylindrical steel rod, 0.01 m in diameter and 0.2 m in length is first heated to 750 ^oC and then immersed in a water bath at 100 ^oC. The heat transfer coefficient is 250 W/m²-K. The density, specific heat and thermal conductivity of steel are ρ = 7801 kg/m³, c = 473 J/kg-K, and k =43 W/m-K, respectively. The time required for the rod to reach 300 ^oC is _____ seconds.

Question 7

A steel ball of diameter 60 mm is initially in thermal equilibrium at 1030 °C in a furnace. It is suddenly removed from the furnace and cooled in ambient air at 30 °C, with convective heat transfer coefficient h = 20 W/m²K. The thermo-physical properties of steel are: Density ρ = 7800 kg/m³. Conductivity k = 40 W/mK and specific heat c = 600 J/kgK. The time required in seconds to cool the steel ball in air from 1030 °C to 430 °C is

Question 8

Heisler charts are used to determine transient heat flow rate and temperature distribution when:

Question 9

In a steady state heat flow equation with Ohm's Law for current flowing through a resistor, we see that:

Question 10

In a furnace made of bricks

Inside heat transfer coefficient = 35 W/ $Description: Description:ISROME2009_files\image024.png$ k

Outside heat transfer coefficient = 25 W/ $Description: Description:ISROME2009_files\image024.png$ k

Thermal conductivity of bricks (15 cm thick) = 0.15 W/ $Description: Description:ISROME2009_files\image024.png$ k
Find Overall Heat transfer coefficient

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ESE & GATE ME Heat Transfer

Apr 23ESE & GATE ME