Thermal Engineering and Gas Dynamics (ME-601) - Important Questions

Explain boiler draught, its purpose and types of draught systems including advantages and disadvantages of artificial draught.

Describe the Lamont high-pressure boiler with neat sketch showing flue gas and water-steam circulation paths.

Describe the Rankine cycle and explain its working with the help of P-V and T-S diagrams.

Explain the binary vapour cycle in detail and discuss its applications in power generation.

What is a stagnation state? Define stagnation properties - stagnation pressure, temperature and enthalpy - and explain their significance in gas dynamics.

Derive the expression for the speed of sound in an ideal gas.

A two-stage air compressor with perfect intercooling takes in air at 1 bar and 276C. The law of compression in both stages is pv^1.3 = constant and compressed air is delivered at 9 bar. Determine the minimum work required per kg of air and heat rejected to the intercooler per kg of air. Take R = 287 J/kgK.

What are rotary compressors and how are air compressors / rotary compressors classified into different types?

Explain the effect of clearance volume on volumetric efficiency and performance of a reciprocating compressor with neat diagram.

In a Rankine cycle the steam inlet pressure is 30 bar and exhaust pressure is 0.20 bar with steam flow rate of 15 kg/s. Determine pump work, turbine work and power, cycle efficiency, heat rejected in condenser and dryness fraction of steam at turbine exit. Neglect pump work if small.

Discuss back pressure in a steam condenser and its effect on power plant performance.

Derive the conditions for maximum discharge through a steam nozzle.

Dry saturated steam at 6.5 bar with negligible velocity expands isentropically in a convergent-divergent nozzle to 1.4 bar with dryness fraction 0.95. Determine the final velocity of steam from the nozzle if 13% of heat drop is lost in friction. Also determine the mass flow rate if throat area is 10 cm2.