131) If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix i and o stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

Vi=V0

Vt>V0

U,<V0

V,= U0

Answer is:

Vi=V0

large gas turbines employ axial flow compressors

axial flow compressors are more stable than centrifugal type compressors but not as efficient

axial flow compressors have high capacity and efficiency

axial flow compressors have instability region of operation

Answer is:

less

same

may be less or more depending on ambient conditons

Answer is:

large gas turbines use radial inflow turbines

gas turbines have their blades similar to steam turbine

gas .turbine′s blade will appear as impulse section at the hub and as a reaction section at tip

gas turbines use both air and liquid cooling

Answer is:

high pressure ratio

increasing gas temperature

high specific volume

paucity of 02.

Answer is: