GATE Mechanical Engineering (ME) 2012 Solved Paper

The velocity triangles at the inlet and exit of the rotor of a turbo machine are shown. V denotes the absolute velocity of the fluid, W denotes the relative velocity of the fluid, and U denotes the blade the velocity. Subscripts 1 and 2 refer to inlet and outlet respectively. If V₂ = W₁ and V₁ = W₂, then the degree of reaction is