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- Question 1 of 15
In a closed-circuit supersonic wind tunnel, the convergent-divergent (C-D) nozzle and test section are followed by a C-D diffuser to swallow the starting shock. Here, we should have theCorrectIncorrect
- Question 2 of 15
A vortex flowmeter works on the principle that the Strouhal number of 0.2 is a constant over a wide range of flow rates. If the bluff-body diameter in the flowmeter is 20 mm and the piezo-electric transducer registers the vortex shedding frequency to be 10 Hz, then the velocity of the flow would be measured asCorrectIncorrect
- Question 3 of 15
The stagnation temperatures at the inlet and exit of a combustion chamber are 600 K and 1200 K, respectively. If the heating value of the fuel is 44 MJ/kg and specific heat at constant pressure for air and hot gases are 1.005 kJ/kg.K and 1.147 kJ/kg.K respectively, the fuel-to-air ratio isCorrectIncorrect
- Question 4 of 15
The propellant in a single stage sounding rocket occupies 60% of its initial mass. If all of it is expended instantaneously at an equivalent exhaust velocity of 3000 m/s, what would be the altitude attained by the payload when launched vertically? [Neglect drag and assume acceleration due to gravity to be constant at 9.81 m/s2.]CorrectIncorrect
- Question 5 of 15
The boundary condition of a rod under longitudinal vibration is changed from fixed-fixed to fixedfree. The fundamental natural frequency of the rod is now k times the original frequency, where k isCorrectIncorrect
- Question 6 of 15
Buckling of the fuselage skin can be delayed byCorrectIncorrect
- Question 7 of 15
With increase in airfoil thickness, the critical Mach number for an airfoil is likely toCorrectIncorrect
- Question 8 of 15
Due to a body in potential flow, the velocity at a point A in the flow field is 20 m/s while the free stream velocity is only 10 m/s. The value of coefficient of pressure (Cp) at the point A isCorrectIncorrect
- Question 9 of 15
Which of the following airfoil will have location of the maximum camber at half chord length from the leading edge?CorrectIncorrect
- Question 10 of 15
Which of the following statement is NOT TRUE across an oblique shock wave?CorrectIncorrect
- Question 11 of 15
For a completely subsonic isentropic flow through a convergent nozzle, which of the following statement is TRUE?CorrectIncorrect
- Question 12 of 15
Which of the following aircraft engines has the highest propulsive efficiency at a cruising Mach number of less than 0.5?CorrectIncorrect
- Question 13 of 15
Air, with a Prandtl number of 0.7, flows over a flat plate at a high Reynolds number. Which of the following statement is TRUE?CorrectIncorrect
- Question 14 of 15
The total number of material constants that are necessary and sufficient to describe the three dimensional Hooke’s law for an isotropic material isCorrectIncorrect
- Question 15 of 15
Determine the correctness or otherwise of the following statements, [a] and [r]:
[a]: In a plane stress problem, the shear strains along the thickness direction of a body are zero but the normal strain along the thickness is not zero.
[r]: In a plane stress problem, Poisson effect induces the normal strain along the thickness direction of the bodyCorrectIncorrect