List of top Mechanical Engineering Questions on Heat Transfer asked in CUET (PG)

For an insulated tip, the fin efficiency is given by

After expansion from a gas turbine, the hot exhaust gases are used to heat the compressed air from a compressor with the help of a cross-flow compact heat exchanger of 0.8 effectiveness. What is the number of transfer units of the heat exchanger?

In which one of the following materials the heat energy propagation is minimum due to conduction heat transfer?

The Nusselt number is related to the Reynolds number in laminar and turbulent flows respectively as:

Given below are two statements:
Statement (I): The heat transfer coefficient for air in free convection varies between 5 to 30 W/m²·K.
Statement (II): The heat transfer coefficient of steam during condensation lies between 5000 to 110000 W/m²·K.
In light of the above statements, choose the most appropriate answer from the options given below.

The shape factor of a hemispherical body placed on a flat surface with respect to itself is

Match List I (Non-Dimensional Number) with List II (Formula):

LIST I	LIST II
A. Nusselt Number	I. \( \mu C_p / k_f \) (where \( k_f \) is thermal conductivity of fluid)
B. Biot Number	II. \( hL / k_s \) (where \( k_s \) is thermal conductivity of solid)
C. Prandtl Number	III. \( h / \rho C_p \)
D. Stanton Number	IV. \( hL / k_f \) (where \( k_f \) is thermal conductivity of fluid)

Choose the correct answer from the options given below.

Lumped Heat capacity analysis can be applied to a system when