JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II FLIGHT MECHANICS I Previous Question Paper (April/May - 2023 - R13)

B.Tech | II | II | R13 | April/May - 2023

Answer PaperPaper Code: 114BHMaximum Marks: 75Time: 3 Hours

Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.

Part A

125 marks

What exactly standard atmosphere means?

2 marks

Answer

A Standard Atmosphere is a theoretical model of the Earth's atmosphere that defines the variation of pressure, temperature, density, and viscosity with altitude based on average conditions at mid-latitudes. It provides a consistent reference frame for aircraft performance calculations and instrument calibration.

Discuss the concept of minimum drag during cruise.

3 marks

Answer

During cruise, minimum drag occurs at the speed where the sum of parasite drag and induced drag is minimized. Since parasite drag increases with the square of velocity and induced drag decreases with the square of velocity, the total drag curve exhibits a minimum point. Flying at this speed optimizes the lift-to-drag ratio, which is critical for maximizing range in jet aircraft.

Mention effect of mixed power plants on cruise performance.

2 marks

Answer

An aircraft has to maintain constant height during cruise with changing speed. How is this achieved? Explain.

3 marks

Answer

What is the Turn rate and Turn velocity and radius?

2 marks

Answer

Discuss the significance of moment of inertial of accelerated motion of aircraft.

3 marks

Answer

Briefly mention the parameters that affect take off distance.

2 marks

Answer

Classify different types of civil aircraft with regard to flight planning and safety requirements.

3 marks

Answer

Discuss the measurement of cruise performance data.

2 marks

Answer

How maximum takeoff weight is assessed? Explain.

3 marks

Answer

Part B

210 marks

A turbo prop engine is rated at 5120 equivalent shaft horsepower at zero velocity at sea level. Consider an airplane with this engine flying at 140m/s at sea level. The jet thrust is 1000 N, and propeller efficiency is 0.85. Calculate equivalent shaft horse power at these conditions.

5 marks

Answer

Differentiate between scheduled and operational performance of aircraft.

5 marks

Answer

Comment on the following:

10 marks

Performance requirement

2 marks

Answer

Performance analysis

3 marks

Answer

Performance estimation

2 marks

Answer

Operational safety and economy.

3 marks

Answer

410 marks

How does alternate altitude variation and fuel flow laws affects the cruise performance of aircraft?

5 marks

Answer

Drag polar of an aircraft having a wing loading of 5kN/m² is characterized by C_D,0 = 0.015, K = 0.073. Calculate maximum values of C_L^3/2/C_D, C_L/C_D, C_L^1/2/C_D and their respective velocities.

5 marks

Answer

510 marks

How angle of attack, Mach number and Reynolds’s number affect the cruise performance of aircraft? Explain.

5 marks

Answer

Determine minimum power required and respective velocity at which it is achieved an aircraft having the below details: Altitude 11000m, Weight 600kN, Plan form area = 110m², Drag polar C_D,0 = 0.014, K = 0.08.

5 marks

Answer

610 marks

What is V-n diagram? How is it manoeuvres and accelerated flight performance? Explain in detail.

5 marks

Answer

An aeroplane is moving at 4.3km altitude. If there is sudden loss of engine thrust, calculate: i) Minimum glide angle ii) Maximum range covered.

5 marks

Answer

710 marks

Calculate minimum turning radius at sea level for an aircraft having the following details: Wing loading 4500 N/m², thrust to weight 0.35, C_D,0 = 0.012, K = 0.06.

5 marks

Answer

Categorize and explain different Instantaneous and sustained turns. Justify the answer with suitable equations and diagrams.

5 marks

Answer

810 marks

Explain the air safety requirements on landing performance of aircraft.

5 marks

Answer

Calculate ground roll distance of an airplane weighing 400kN taking off at standard sea level. Take friction coefficient 0.38, wing loading 75 N/m², C_D,0 = 0.012, ΔC_D,0 = 0.0165, k1 = 0.018, G = 0.564, lift coeff. 0.1.

5 marks

Answer

910 marks

Discuss all safety factors to be taken in to account for Take-off performance.

5 marks

Answer

Calculate ground roll distance of an airplane weighing 520kN landing at standard sea level. Take friction coefficient 0.42, wing loading 81 N/m², C_D,0 = 0.012, ΔC_D,0 = 0.015, k1 = 0.016, G = 0.444, lift coeff. 0.1.

5 marks

Answer

1010 marks

Explain the significance of principal performance variables on performance of aircraft.

5 marks

Answer

Describe the estimation of maximum takeoff weight.

5 marks

Answer

1110 marks

Enumerate on the necessity of performance measurement in flight.

5 marks

Answer

Describe the priority of aircraft datum performance charts.

5 marks

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II FLIGHT MECHANICS I Previous Question Paper (April/May - 2023 - R13)

Part A

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Part B

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