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Aerospace Engineering

2026 · Paper 1

Take it one question at a time. Try an answer, then check your understanding.

Complete GATE AE 2026 Paper 1 overview, original pages and practice · Timed previous-paper practice

Questions 64–65 of 65. Imported answers require review unless explicitly marked reviewed.

Paper practice 65 questionsPage 22 of 22

Question 64

Open question
AENAT2 marksNeeds review
Consider a centered Prandtl-Meyer expansion fan at a

corner in a Mach 1.78 air flow, as shown in the figure below. The angle

(see figure) made by the ending wave of the fan with respect to the incoming stream is ________ degrees (rounded off to 1 decimal place).
An excerpt from the table of Prandtl-Meyer function for air is provided below.
Diagram for Aerospace Engineering question 64

M

[deg]
M

[deg]
M

[deg]
1.72
18.40
1.82
21.30
1.92
24.15
1.74
18.98
1.84
21.88
1.94
24.71
1.76
19.56
1.86
22.45
1.96
25.27
1.78
20.15
1.88
23.02
1.98
25.83
1.80
20.73
1.90
23.59
2.00
26.38

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Question 65

Open question
AENAT2 marksNeeds review
A Mach 1.5 air flow enters a round duct of length 20 cm and diameter 3 cm. If the flow exits with Mach number 1.1, the average Fanning friction factor

of the duct is ________

(rounded off to 1 decimal place).
An excerpt from the Fanno flow table for air is given below.

1.1
1.2
1.3
1.4
1.5
1.6

99.35
336.4
648.3
997.4
1361
1724

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