Download Aptitude Crack
img not found img not found

Chemical Engineering Basics - Engineering

Q1:

The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)

A T

B 1/T

C T2

D 1/T2

ANS:A - T

The ratio of thermal conductivity (�κ) to electrical conductivity (�σ) is described by the Wiedemann-Franz law, which states that at a given temperature, this ratio is proportional to the temperature (T). Mathematically, the Wiedemann-Franz law can be expressed as: ��=��σκ​=LT Where:

  • κ is the thermal conductivity,
  • σ is the electrical conductivity,
  • L is the Lorenz number, which is a constant, and
  • T is the absolute temperature (in Kelvin).
So, the ratio of thermal conductivity to electrical conductivity (σκ​) is proportional to the absolute temperature (T). Therefore, the correct answer is: T