JNTU B.Tech III THERMAL ENGINEERING II Previous Question Paper (March - 2024 - R13)

Define Stoichiometric quantity of air.

Explain the concept of Mean temperature of heat addition.

Write the significance of accessories of a boiler.

What is the effect of friction on the flow through a steam nozzle?

Draw velocity triangle at exit for impulse turbine.

List out the merits and demerits of surface condensers over jet condensers.

What is the purpose of regeneration in the gas turbine?

Distinguish between an ideal gas turbine plant and an actual gas turbine plant.

Write equation for Thrust power and propulsive power.

List out the desirable properties required for liquid propellant rockets.

What are the advantages and disadvantages of regenerative cycle over simple Rankine cycle?

Calculate the height of a chimney required to produce a draught equivalent to 1.7cm of water if the flue gas temperature is 270 deg C and ambient temperature is 22 deg C and minimum amount of air per kg of fuel is 17kg?

In a Rankine cycle, the steam at inlet to turbine is saturated at pressure of 30 bar and exhaust pressure is 0.25 bar. Determine (i) The pump work (ii) Turbine work (iii) Rankine efficiency?

Write short note on adiabatic flame temperature.

Explain with the help of neat diagram Lancashire boiler.

An impulse turbine of 1MW has steam entering at 20 bar 300 deg C and steam consumption of 8 kg per kW hour. Steam leaves at 0.2 bar and 10% of total heat drop is lost in overcoming friction in deveining portion of nozzle. If throat diameter of each nozzle is 1 cm then determine (i) the number of nozzles required (ii) exit diameter of each nozzle.

Sketch and describe the operation of Cochran vertical boiler. What are its special features?

Explain the effect of friction in nozzle flow with the help of h-s diagram.

Draw the line diagram and explain pressure compounded impulse turbine.

Sketch and describe the operation of down flow surface condenser.

Define the term Degree of Reaction used in Reaction Turbines. Prove that moving and fixed blades should have the same shape for 50% reaction.

Sketch and describe the operation of central flow surface condenser.

Draw the line diagram and explain the Reheat gas turbine cycle.

A gas turbine plant receives air at 1 bar and 290K and compresses it to 5bar. If the temperature of air after compression is 1000K. Find the thermal efficiency of the turbine? Take γ=1.4 for air.

Explain the stages of combustion in a gas turbine combustion chamber with a neat sketch.

Derive an expression for the efficiency as a function of temperature ratio and pressure ratio of the cycle for an ideal gas turbine cycle with reheat and heat exchange.

Explain the working of Turbojet engine with the help of pressure, velocity, temperature Variations.

Describe the operation of ramjet engine.

List out the requirements of an ideal rocket propellant and give the applications of Rockets.

A jet plane having 2 jets works on turbo-jet system. It flies at a speed of 800km/hr. at an altitude where density of air is 0.15 kg/m3. The propulsive efficiency is 55%. The drag on the plane is 6500N. Calculate i) Absolute velocity of jet ii) quantity of compressed air and iii) diameter of jet?