Eddy viscosity is a turbulent transfer of momentum by eddies. It gives rise to an internal fluid friction. It is in analogous to action of molecular viscosity in laminar fluid flow. Eddy viscosity takes place on a large scale.

The performance of a flow device is expressed in terms of its isentropic efficiency. The actual performance of device is compared with that of its isentropic device. It happens at same inlet and exit conditions.

One dimensional flow refers to flow of gas through a duct or channel in which flow parameters are assumed to change significantly along a particular dimension. In this case, it?s about its duct length.

Viscosity is not a generic property sound. It is defined as property of resistance to flow of fluid. Resistance to flow of fluid takes place when one layer of fluid slides over or. Viscosity is not a generic property.

Mass flow rate is given by Q = m/p. This is a relation expressed for mass flow rate. With presence of a converging duct, velocity decreases. At this point, area of duct is more than zero.

Stagnation pressure minus freestream static pressure gives freestream dynamic pressure. This plays an important role in determining pressure coefficient. Hence, pressure coefficient at stagnation points is +1.

When fluid flow is discontinuous, a control volume is established. It is established around shock wave. It is treated as a discontinuity where entropy increases to over a infinitesimally large region.

Speed of sound in ideal gas depends on its composition and temperature. The speed of sound has a weak dependence on frequency and pressure. As re is a slight deviating behaviour in an ideal fluid.

Volumetric flow rate is given by Q= A.v. Where v is flow velocity of fluid, and A is area of cross section of surface. Area of a surface is also called as vector area. Thus, right answer is Q = Av.

The performance of a flow device is expressed in terms of its isentropic efficiency. The actual performance of device is compared with that of its isentropic device. It happens at same inlet and exit conditions.