Question bank

GDJP PART-A

MODULE-I

1,What is a system and control volume.

2,What is acoustic waves and sonic velocity.

3,What is mach cone and mach angle.

4,What is compressibility factor.

5,Based on mach number classify the types of fluid flow regions plotting velocity of flow and sound.

6,Define continuity and momentum equations in general.

7,In a convergent duct with an inlet area = 2m2 and exit area =1.75m2.air enters with a velocity of 600m/s and a density of 0.9kg/m3 and leaves with a velocity of 712m/s.calculate the density of air at exit.

MODULE –II

1, What is Stagnation enthalpy and stagnation temperature.

2 ,Define stagnation pressure & stagnation velocity of sound.

3,What is maximum fluid velocity and critical velocity of sound.

4,What is Crocco number.

5,What is the difference between Adiabatic and Isentropic Compression process.

6,Derive Bernoulli’s Equation through Stagnation Enthalpy for Isentropic, Incompressible flow.

7,Derive Bernoulli’s Equation through Stagnation Enthalpy for Isentropic and Compressible flow.

8,What is Impulse function.

9,Define the phenomenon of chocking in gas dynamics.

PART-B

MODULE-I

1,An aircraft is flying at 1.6 mach at 2000 and 10,000m altitudes.the atmospheric pressure and densities at these altitudes are 90 X 103 N/m2,29.3 X X 103 N/m2 and 1.113kg/m3,0.42kg/m3 respectively.calculate the speed of air craft at these altitudes in km/h.

2,An aircraft flying at 2.4 mach number at 2000m altitude above a person standing on ground.if atmospheric temperature is 220C,what is the time lapseat which Sonic bang reaches the observer after the plane is directly overhead? Find the horizontal distance travelled by Aircraft at the time of reaching the ground

3,A fighter aeroplane flying at 4000m altitude in level flight .Sonic Boom reaches the ground after 9.5seconds after the aeroplane passing off overhead.If the temperature of atmosphere is 120C.what will be the speed of the aeroplane in km/h and Mach Number.

MODULE-II

1, (a) Describe flow through convergent nozzle and phenomenon of chocking. ( 6 marks)

(b) Air flowing in a duct a velocity of 300m/s,pressure 1.0bar and temperature 290K.Taking √= 1.4 and R = 287J/Kg-K,Determine:

(i) stagnation pressure and temperature,

(ii) velocity of sound in the dynamic and stagnation conditions,

(iii) stagnation pressure assuming constant density.

2, A conical diffuser has entry and exit diameters of 15cm and 30cm respectively.the pressure,temperature and velocity of air at entry are 0.69bar,340K and 180m/s respectively.Determine:

(a) The exit pressure,(b) The exit velocity and (c) The force exerted on the diffuser walls.

Assume isentropic flow , √= 1.4, Cp = 1.00KJ/Kg-K.