Aerospace Engineering Gate Yearwise 


Aerospace Engineering Gate 2026 Questions with Answer

Ques 40 GATE 2026

In the figure shown below, the flow at the nozzle exit is ________.

A

overexpanded

B

underexpanded

C

ideally expanded

D

subsonic


(b) is the correct answer.

Ques 41 GATE 2026

For a given air-standard power, the propulsive efficiency of a turbofan engine is more than that of a turbojet engine. Which of the following is/are the reason(s) for this?

A

The mass flow rate is more for a turbofan engine

B

The exit velocity is lower for a turbofan engine

C

A turbofan engine operates at a lower altitude

D

The fan of a turbofan engine consumes lesser power


(a,b) is the correct answer.

Ques 42 GATE 2026

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

Configuration I corresponds to the rotor of a compressor and Configuration II corresponds to the rotor of a turbine

B

Configuration I corresponds to the rotor of a turbine and Configuration II corresponds to the rotor of a compressor

C

The rotor blades of the turbomachine in Configuration I move along the +θ direction

D

The rotor blades of the turbomachine in Configuration II move along the +θ direction


(a,c) is the correct answer.

Ques 43 GATE 2026

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

A

ηA > ηB

B

ηB > ηA

C

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

D

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


(a,c,d) is the correct answer.

Ques 44 GATE 2026

In an ideal turbofan engine shown in the figure below, the compressor is driven by the high pressure turbine, and the fan is driven by the low pressure turbine. The stations 0, 2, 3, 4, 4.5, and 5 refer to free-stream, compressor inlet, compressor outlet, combustor exit, high pressure turbine exit, and low pressure turbine exit, respectively, and the subscript ‘t’ refers to the total condition. Also, τr = Tt0/T0, τc = Tt3/Tt2 and τλ = Tt4/T0. The total temperature ratio of the high pressure turbine (Tt4.5/Tt4) is given by ______.

A

1 − (τr/τλ)(τc − 1)

B

1 + (τr/τλ)(τc + 1)

C

1 − (τr/τλ)(τc + 1)

D

1 + (τr/τλ)(τc − 1)


(a) is the correct answer.

Ques 45 GATE 2026

An ideal rocket has characteristic exhaust velocity of 1200 m/s, mass flow rate of 75 kg/s, thrust coefficient of 1.5, and nozzle throat area of 0.025 m2. The chamber pressure in kPa and the specific impulse due to gravity in seconds are ________, respectively. Assume that the acceleration due to gravity is 9.8 m/s2.

A

3600 and 183.67

B

4600 and 190.51

C

3600 and 175.23

D

3500 and 183.67


(a) is the correct answer.

Ques 46 GATE 2026

Consider a launch vehicle of mass 10 tons being launched vertically. The vehicle has 8 tons of propellant, which burns completely at a constant rate over 50 s. If the engine specific impulse is 250 s, and the acceleration due to gravity at sea level is g0, the acceleration experienced by the vehicle at lift-off is ________.

A

g0

B

2g0

C

3g0

D

4g0


(a) is the correct answer.

Ques 47 GATE 2026

The figure below shows a compressor stage with station numbers 1, 2, and 3 as indicated. If p0i, T0i, and Ci refer to the average values of total pressure, total temperature, and absolute flow speed, respectively, at the ith station, select the CORRECT option considering losses.

A

p01 < p02, p02 > p03 ; T01 < T02, T02 ≈ T03 ; C1 < C2, C2 > C3

B

p01 < p02, p02 = p03 ; T01 < T02, T02 ≈ T03 ; C1 < C2, C2 = C3

C

p01 < p02, p02 > p03 ; T01 < T02, T02 < T03 ; C1 > C2, C2 > C3

D

p01 < p02, p02 < p03 ; T01 < T02, T02 < T03 ; C1 = C2 = C3


(a) is the correct answer.

Ques 48 GATE 2026

Which of the following process(es) is/are involved in the compression of air in an ideal ramjet engine?

A

oblique shock

B

mechanical compression

C

normal shock

D

subsonic diffusion


(a,c,d) is the correct answer.

Ques 49 GATE 2026

The figure below shows the velocity triangles at the inlet and outlet of the rotor of a low hub-to-tip ratio axial compressor at the mid-span of the blade. The absolute and relative velocities of the flow are denoted by C and W, respectively. The subscripts 1 and 2 refer to the locations before and after the rotor, respectively. The blade velocity is denoted by U. Select the CORRECT statement(s) for this device.

A

The axial velocity is constant across the rotor

B

The flow coefficient is 0.6

C

The blade loading coefficient is 0.6

D

If the acoustic velocity at the rotor inlet is 350 m/s, then the inlet relative Mach number is 0.333


(a,b,c,d) is the correct answer.

Ques 50 GATE 2026

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 êr + 75 êθ) m/s and (u êr + 50 êθ) 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).


(40) is the correct answer.

Ques 51 GATE 2026

A gas mixture at a pressure of 800 kPa and a density of 5 kg/m3 enters a turbine stage. The temperature of the gas at the nozzle exit and the stage exit are 790 K and 750 K, respectively. Assume the specific heats are constant for the gas mixture in the range of temperatures considered. The specific heat at constant pressure is 0.72 kJ/kg-K and the ratio of specific heats is 1.33. The value of the degree of reaction of the turbine stage is ________ (rounded off to 2 decimal places).


(0.5) is the correct answer.

Ques 52 GATE 2026

An earth satellite has the instantaneous position vector r⃗ and velocity vector v⃗ as given below. Here p̂ and q̂ denote the unit vectors along the x and y axes of the perifocal frame, respectively. Assume that the value of gravitational parameter is 398600 km3/s2. Which one of the following trajectories does the satellite follow?
r⃗ = (8000p̂ + 9000q̂) km and v⃗ = (−6p̂ + 6q̂) km/s

A

Circle

B

Hyperbola

C

Parabola

D

Straight line


(c) is the correct answer.

Unique Visitor Count

Total Unique Visitors

Loading......

Question Options

Contributed by: