List of top Propulsion Questions on Axial Compressors asked in GATE AE

The figure below shows a compressor stage with station numbers 1, 2, and 3 as indicated. If \(p_{0i}\), \(T_{0i}\), and \(C_i\) refer to the average values of total pressure, total temperature, and absolute flow speed, respectively, at the \(i^{th}\) station, select the CORRECT option considering losses.

A multi-stage axial compressor can be operated at two points, A and B, both of which lie on the same speed line, as shown in the figure below. If \(\eta\) is the isentropic efficiency of the compressor, select the statements that is/are TRUE.

The figure below shows the blading of the rotors of two different axial turbomachines under their typical operating conditions, labelled as Configuration I and Configuration II. Which of the following statements is/are TRUE?

A centrifugal compressor has a constant-width radial diffuser. The diameters at the diffuser inlet and outlet are \(0.2\) m and \(0.3\) m, respectively. The flow at the diffuser inlet and outlet is assumed to be steady and uniform. The average velocity at the diffuser inlet and outlet are \((60\,\hat{e}_r + 75\,\hat{e}_{\theta})\) m/s and \((u\,\hat{e}_r + 50\,\hat{e}_{\theta})\) m/s, respectively. If the flow through the diffuser is treated as steady and incompressible, the value of \(u\) is _______ (rounded off to the nearest integer).