Test: Degree of Reaction - Civil Engineering (CE) MCQ

The formation of vapour cavities is called cavitation. It is formed due to the presence of small free liquids with different zones. These zones consists of different layers of forces acting on them.

Voids in a turbine or pump is created due to the presence of liquid free layers. It is formed due to the presence of small free liquids with different zones. These zones consists of different layers of forces acting on them.

Degree of reaction is most commonly used in turbomachinery. Degree of reaction is defined as the ratio of the static pressure drop in the rotor to the static pressure drop in the stage. It can also be defined in the same way for enthalpy in different stages. It is denoted by the letter ‘R’.

Voids that implode near metal surface develops a cyclic stress. This happens mainly due to repeated implosion of voids. Thus, option ‘b’ is correct.

The velocity triangle represents various components. It mainly determines the velocities of fluids that act in a turbomachinery. It can be drawn for both inlet and outlet triangles with its angles.

Hydrodynamic cavitation is due to the process of vaporisation. A bubble generation takes place in which implosion occurs during the flowing of liquid.

Degree of reaction is defined to be the ratio of pressure and total energies inside the runner of a turbine.

When a container containing a liquid is rotated, then due to centrifugal action there is a change in pressure energy.

Radial discharge is the angle made by absolute velocity with the tangent on the wheel is 90 degrees and the component of whirl velocity is zero. Radial discharge at outlet means the angle beta is 90.

The velocity triangle represents various components. It mainly determines the velocities of fluids that act in a turbomachinery. It can be drawn for both inlet and outlet triangles with its angles.