First Law Of Thermodynamics

Question 1

Define first law of thermodynamics

Answer 1

When system undergo thermodynamics cycle, net heat transfer from surrounding= net work done by system. Q=W

Or

Energy cannot be destroyed or made but can change form (principle of energy conservation)

Question 2

Corollary of 1st law of thermodynamics

Answer 2

1. du = dq - dw
2. Internal enegy, u does not change
3. Change in u is 0
4. Perpetual motion machine is impossible

Question 3

State the steady flow energy equation

Answer 3

q - w = (c2²-c1²)/2 + (h2 - h1) + g(z2-z1)

Question 4

State the enthalpy equation

Answer 4

h = u +pv

Question 5

State the fluid continuity equation

Answer 5

m = cA/v