GATE AE Basics PYQs & Answers — Page 3

Questions 21–26 of 26. Imported answers require independent review unless marked reviewed.

The first law of thermodynamics is also known as conservation of

Your answerChoose one option.

mass.

momentum.

energy.

species.

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The theoretical maximum velocity (in m/s) of air expanding from a reservoir at 700 K is ________ (accurate to two decimal places). Specific heat of air at constant pressure is 1005 J/(kg-K).

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A combustor is operating with a fuel-air ratio of 0.03. If the stoichiometric fuel-air ratio of the fuel used is 0.06, the equivalence ratio of the combustor will be ______ (accurate to two decimal places).

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Consider a system consisting of certain amount of perfect gas enclosed in a cylinder fitted with a frictionless piston. This system can undergo following processes (i) Expansion with finite pressure difference with the surrounding. (ii) Compression with infinitesimal pressure difference with the surrounding. (iii) Heat transfer with finite temperature difference with the reservoir. (iv) Heat transfer with infinitesimal temperature difference with the reservoir. Out of these which processes are reversible?

Your answerChoose one option.

(i) and (iii)

(i) and (iv)

(ii) and (iii)

(ii) and (iv)

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In a combustor, gaseous Octane (C₈H₁₈) and air are to be burned in stoichiometric proportions. If the required flow rate of air is 1 kg/s, what should be the corresponding flow rate of Octane?

Your answerChoose one option.

0.066 kg/s

15.15 kg/s

0.16 kg/s

6.25 kg/s

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Air, at 450 K station temperature and at a rate of 50 kg/s, enters the combustor of a turbofan engine and is burned with 1 kg/s of Aviation Kerosene (Heating value 44 MJ/kg). The specific heat at constant pressure for the incoming air and the burned products are 1.005 kJ/kgK and 1.147 kJ/kgK respectively. Considering 100% burner efficiency, the station temperature at the exit of the combustor is equal to ________ K. (in one decimal place).

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GATE AE Basics PYQs

Question 18

Question 21

Question 25

Question 15

Question 45

Question 48