List of top Mechanical Engineering Questions on Heat Transfer asked in TS PGECET

Expansion bellows are provided in the shell and tube heat exchangers in order to
If the surface temperature of hot body is doubled, then rate of radiation energy emitted will be enhanced by a factor of
On the specified surface, if \(35 \%\) of incident radiation energy is reflected and the transmissivity of the body is \(0.3\), then the emissivity of the surface is
During a summer day a scooter rider feels more comfortable while on the move than while at rest at a stop light because
For heat transfer calculation in fins, if the Biot number is very small (\(\text{Bi} < 0.1\)) it implies
The characteristic length (\(\text{L}_{\text{c}}\)) for the calculation of Biot number (\(\text{Bi}\)) for a sphere of radius 'R' subjected to Newtonian cooling is
For a fully developed flow through a pipe, how will the heat transfer coefficient (h) change, when the mean flow rate is doubled with all other conditions remaining the same?
If the surface temperature of hot body is doubled, then rate of radiation energy emitted will be enhanced by a factor of
Expansion bellows are provided in the shell and tube heat exchangers in order to
On the specified surface, if \(35 \%\) of incident radiation energy is reflected and the transmissivity of the body is \(0.3\), then the emissivity of the surface is
For a fully developed flow through a pipe, how will the heat transfer coefficient (h) change, when the mean flow rate is doubled with all other conditions remaining the same?
During a summer day a scooter rider feels more comfortable while on the move than while at rest at a stop light because
For heat transfer calculation in fins, if the Biot number is very small (\(\text{Bi} < 0.1\)) it implies
The characteristic length (\(\text{L}_{\text{c}}\)) for the calculation of Biot number (\(\text{Bi}\)) for a sphere of radius 'R' subjected to Newtonian cooling is
On the specified surface, if \(35 \%\) of incident radiation energy is reflected and the transmissivity of the body is \(0.3\), then the emissivity of the surface is
During a summer day a scooter rider feels more comfortable while on the move than while at rest at a stop light because
For heat transfer calculation in fins, if the Biot number is very small (\(\text{Bi} \lt 0.1\)) it implies
The characteristic length (\(\text{L}_{\text{c}}\)) for the calculation of Biot number (Bi) for a sphere of radius 'R' subjected to Newtonian cooling is
For a fully developed flow through a pipe, how will the heat transfer coefficient (h) change, when the mean flow rate is doubled with all other conditions remaining the same?
If the surface temperature of hot body is doubled, then rate of radiation energy emitted will be enhanced by a factor of
Expansion bellows are provided in the shell and tube heat exchangers in order to
If 'k' is the thermal conductivity, '$ \rho $' is the mass density and 'c' is the specific heat then the thermal diffusivity of substance is
A hollow pipe of 10 mm outer diameter is to be insulated by thick cylindrical insulation having thermal conductivity of 1 W/m K. The surface heat transfer coefficient on the insulation surface is 5 W/m$ ^2 $ K. What is the minimum effective thickness of insulation for causing the reduction in heat leakage from the insulated pipe?
For the fins arrangement, when the other conditions are remaining same, to get better effectiveness the fins should be
In the lumped mass system of transient analysis, for calculation of Biot number, the characteristic length should be considered as the ratio of