GATE AE Basics PYQs & Answers

Questions 1–10 of 26. Imported answers require independent review unless marked reviewed.

Which one of the following makes an ideal air-standard Stirling cycle?

Your answerChoose one option.

Two reversible isobars, and two reversible adiabatics

Two reversible isotherms, and two reversible isobars

Two reversible isotherms, and two reversible isochores

Isentropic compression, constant volume heat addition, isentropic expansion, and constant volume heat rejection

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The figure below depicts two ideal gas turbine cycles, cycle 1-2-3-4-1 and cycle 1-2-3'-4'-1, on a T-s diagram. Which one the following statements is FALSE?

Diagram for Aerospace Engineering question 18

Your answerChoose one option.

The thermal efficiency of the two cycles is the same

The specific work of the two cycles is the same

The processes 2-3 and 2-3' are isobaric

The amount of heat added in the combustion process is greater for the cycle 1-2-3'-4'-1

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Isobutane (C₄H₁₀) is burnt completely in pure oxygen as per the reaction given below. Given that the standard heats of formation (in kcal/mole) of isobutane, carbon dioxide, and water vapour are −31.49, −94.052, and −60.150, respectively, the heat of reaction is ________ kcal (rounded off to 2 decimal places).

C₄H₁₀ + 6.5 O₂ → 4 CO₂ + 5 H₂O

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A furnace of 250 MW rating is used to melt and raise the temperature of aluminum from 25 °C to 900 °C. Aluminum has a solid-state specific heat, latent heat, and liquid-state specific heat of 0.9 kJ/kg-K, 390 kJ/kg, and 1.08 kJ/kg-K, respectively, and the furnace has 70% efficiency. The melting point of aluminum is 660 °C. The amount of aluminum that can be processed per hour is ________ kg (rounded off to 1 decimal place).

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and

are the heat and work interactions of a system with its surroundings, and

is the change in the internal energy of the system. For an adiabatic process in a closed, constant pressure combustor, which one of the following options is correct?

Your answerChoose one option.

and

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A gaseous fuel mixture comprising 3 moles of methane and 2 moles of ammonia is combusted in X moles of pure oxygen in stoichiometric amount. Assuming complete combustion, with only CO

, H

O and N

in the product gases, the value of X is ____. The displayed reaction is: 3 CH

+ 2 NH

+ X O

→ Products (CO

, H

O, N

Your answerChoose one option.

7.5

5.5

8.5

9.5

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Air at temperature 300 K is compressed isentropically from a pressure of 1 bar to 10 bar in a compressor. Eighty percent of the compressed air is supplied to a combustor. In the combustor, 0.8 MJ of heat is added per kg of air. The specific heat at constant pressure is

J/kg/K and the specific heat ratio is

. The temperature of the air leaving the combustor is ____ K (rounded off to one decimal place).

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For an ideal gas, the specific heat at constant pressure is 1147 J/kg K and the ratio of specific heats is equal to 1.33. What is the value of the gas constant for this gas in J/kg K?

Your answerChoose one option.

284.6

1005

862.4

8314

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A surrogate liquid hydrocarbon fuel, approximated as

, is being burned in a land-based gas turbine combustor with dry air (79%

and 21%

by volume). How many moles of dry air are required for the stoichiometric combustion of the surrogate fuel with dry air at atmospheric temperature and pressure?

Your answerChoose one option.

61.9

30.95

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In the figure shown below, various thermodynamics processes for an ideal gas are represented. Match each curve with the process that it best represents.

Your answerChoose one option.

aa′ – Isentropic; bb′ – Isothermal; cc′ – Isobaric; dd′ – Isochoric

aa′ – Isothermal; bb′ – Isentropic; cc′ – Isochoric; dd′ – Isobaric

aa′ – Isothermal; bb′ – Isentropic; cc′ – Isobaric; dd′ – Isochoric

aa′ – Isothermal; bb′ – Isobaric; cc′ – Isentropic; dd′ – Isochoric

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GATE AE Basics PYQs

How to practice Basics

Question 14

Question 18

Question 52

Question 53

Question 31

Question 33

Question 62

Question 16

Question 17

Question 18