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SSC-JE ME || Heat Transfer Quiz - 4

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Question 1

Heat is lost from a 150 mm diameter pipe vertically placed in ambient at 30 °C. The height of the cylinder is 200 mm and thermal conductivity of air is 0.04W/mK. If the Nusselt number is 30, then the heat transfer coefficient will be

Question 2

The side surface of car is given as flat plate of 3m length. It receives solar heat at the rate of 500 W/m² while car is in speed of 50 km/hr. Assume inside surface as an insulated one. Calculate nusselt number.
Given properties are ν = 1.6 x 10^-5 m²/sec , Pr = 0.5

Question 3

Heat is lost from a 200 mm diameter steam pipe placed horizontally in ambient at 30°C . If the Nusselt number is 50 and thermal conductivity of air is 0.05 W/mK, then convective heat transfer co-efficient will be_______.

Question 4

On the basis of rayleigh’s number, flow is laminar when

Question 5

Given that Nu = Nusselt number,
Re = Reynolds number, Pr = Prandtl number
Sh = Sherwood number, Sc = Schmidt number, Gr = Grashoff number
The function relationship for free convective heat transfer is given as,

Question 6

For flow of fluid over a heated plate, the following fluid properties are known:
viscosity = 0.001 Pa.s; specific heat at constant pressure = 1kJ/kg.K;
thermal conductivity = 1 W/m.K.
The hydrodynamic boundary layer thickness at a specified location on the plate is 1 mm. The thermal boundary layer thickness at the same location is

Question 7

A sphere, a cube and a disc all of the same material, quality and volume are heated to 900 K and left in air. Which of these will have the lowest rate of cooling

Question 8

In natural convection heat transfer, Nusselt number is a function of:

Question 9

A flat plate(3x4)m² is immersed in a liquid having constant temperature of 27

and the plate temperature is 127

if the heat transferred from the plate to the liquid at the rate of 500kW. Assume that heat transfer is at steady state. Find the heat transfer coefficient(in W/m²k ) of the liquid side ______.

Question 10

The denominator of the Nusselt number involves the thermal conductivity of the

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AE & JE Exams Mechanical Engineering

Aug 19AE & JE Exams