Question

 Euler equation of turbine giving energy transfer per unit mass E₀(where U, V_W, V_r and V represents the peripheral, whirl, relative and absolute velocities respectively. suffix 1 and 2 refer to the turbine inlet and outlet respectively) is given b y                       

(a) E₀ = U₁ V_W1- U₂ V_W2                    

(b) E₀ = U₁ V_r1 –U₂ V_r2

(c) E₀ = U₁ V₁- U₂ V₂             

(d) E₀= V₁ V_W1- V₂ V_W2