GATE AE Basics PYQs & Answers — Page 2

Questions 11–20 of 26. Imported answers require independent review unless marked reviewed.

In an airbreathing gas turbine engine, the combustor inlet temperature is 600 K. The heating value of the fuel is 43.4 × 10⁶ J/kg. Assume Cₚ to be 1100 J/kg K for air and burned gases, and fuel-air ratio f<< 1.0. Neglect kinetic energy at the inlet and exit of the combustor and assume 100% burner efficiency. What is the fuel-air ratio required to achieve 1300 K temperature at the combustor exit?

Your answerChoose one option.

0.0177

0.0215

0.0127

0.0277

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The ratio of the speed of sound in H

(molecular weight 2 kg/kmol) to that in N

(molecular weight 28 kg/kmol) at temperature 300 K and pressure 2 bar is ____. (round off to two decimal places)

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A gas turbine combustor is burning methane and air at an equivalence ratio

, where

and

is the ratio of mass flow rate of fuel to the mass flow rate of air at stoichiometry. If the air flow rate is

kg/s then the mass flow rate of methane is _____ kg/s. (round off to two decimal places)

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The region of highest static temperature in a rocket engine and the region of highest heat flux are ____________, respectively.

Your answerChoose one option.

nozzle throat and nozzle entry

combustion chamber and nozzle throat

nozzle exit and nozzle throat

nozzle throat and combustion chamber

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Which of the following is NOT always true for a combustion process taking place in a closed system?

Your answerChoose one option.

Total number of atoms is conserved

Total number of molecules is conserved

Total number of atoms of each element is conserved

Total mass is conserved

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The combustion process in a turbo-shaft engine during ideal operation is:

Your answerChoose one option.

isentropic

isobaric

isochoric

isothermal

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The figure shows three glasses P, Q and R with water and floating ice cube. Glass P has a solid ice cube, glass Q has an ice cube with a small solid steel ball embedded in it and glass R has an ice cube with an air bubble. After the ice cube melts, the level of water in glasses P, Q and R, respectively:

Diagram for Aerospace Engineering question 27

Your answerChoose one option.

remains same, increases, and decreases

increases, decreases, and increases

remains same, decreases, and decreases

remains same, decreases, and increases

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The operating conditions of an aircraft engine combustor are as follows. The rate of total enthalpy of air entering the combustor = 28.94 MJ/s. The rate of total enthalpy of air leaving the combustor = 115.42 MJ/s. Mass flow rate of air = 32 kg/s. Air to fuel mass ratio = 15.6. Lower heating value of the fuel = 46 MJ/kg. The efficiency of the combustor is ______% (round off to two decimal places).

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For the complete combustion of 1 mole of ethanol (C

OH), the required number of moles of oxygen is ______.

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One kg of diatomic gas is heated and its temperature increases from 100 K to 600 K. The energy added at constant pressure during this process is 500 kJ. The specific heat at constant volume for the gas is ______ kJ/kgK. (round off to 2 decimal places).

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GATE AE Basics PYQs

Question 19

Question 33

Question 61

Question 23

Question 42

Question 5

Question 27

Question 48

Question 20

Question 21