GATE AE 2026 Paper 1 — page 10

Questions 28–30 of 65. Imported answers require review unless explicitly marked reviewed.

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

is the isentropic efficiency of the compressor, select the statements that are TRUE.

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In comparison to point B, point A is closer to the surge point

In comparison to point A, point B is closer to the choke point

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Which of the following statements is/are TRUE regarding critical and drag divergence Mach numbers of a wing?

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Critical Mach number is the minimum freestream Mach number for which sonic condition is attained somewhere over the wing

Drag divergence Mach number is always higher than the critical Mach number

Drag divergence Mach number is the local Mach number over the wing at which the drag increases drastically

Critical Mach number is independent of the angle of attack

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A flow is steady, inviscid and one-dimensional, with no shaft work or body forces. Which of the following is/are possible under the given conditions?

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Oblique shocks

Sound propagation

Rayleigh flow

Fanno flow

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2026 · Paper 1