Rockets - Propulsion - Aerospace Engineering Previous Year Questions

On which one of the following thermodynamic cycles does an ideal ramjet operate?

Air enters through the eye of a centrifugal compressor with a stagnation temperature 300 K and exits the compressor with a stagnation temperature 424 K. If the isentropic efficiency of the compressor is 0.81 and the ratio of specific heats of the flowing gas (assumed as constant) is 1.4, then the pressure ratio across the compressor is

Which one of the following materials should be selected to design an axial flow turbine operating at high temperatures?

Which one of the following values is nearer to the vacuum specific impulse of a rocket engine using liquid hydrogen and liquid oxygen as propellants?

If the polytropic efficiency of the compressor is 0.89, then the isentropic efficiency of the compressor is

A turbojet engine is operating with afterburner off. If the afterburner is switched on, then

A centrifugal compressor operates with a tip blade speed of 340 m/s. The air leaves the impeller with a radial velocity of 88 m/s. If the slip factor is 0.85, the relative velocity at the blade tip is

A 50 percent degree of reaction axial flow turbine operates with a mean blade speed of 180 m/s. The flow leaves the stator and enters the rotor at an angle of 60 degrees to the axial direction. The axial velocity is 150 m/s, and remains constant throughout the stage. The turbine power per unit mass flow is

The initial temperature sensitivity of burn rate of a solid rocket motor propellant is positive. If the initial temperature increases then

Neglecting gravity and drag effects, if the initial velocity of the liquid rocket engine is 2.5 km/s, the velocity of the rocket at burnout is