Fourier heat conduction equation.

Question

Consider the following statements:

The Fourier heat conduction equation

1. Steady- state conditions.
2. Constant value of thermal conductivity                     (IES-98)
3. Uniform temperatures at the wall surfaces.
4. One – dimensional heat flow.

Which of these statements are correct?

(a) 1,2 and 3                (b)1,2 and 4

(c)2,3 and 4                 (d)1,3 and 4