Compressors, Gas Turbines And Jet Engines MCQ Questions & Answers | Mechanical Engineering

Turbofan engine employs Two or more air streams

Gas turbines for power generation are normally used To supply peak load requirements

The criterion of the thermodynamic efficiency for rotary compressor is Isentropic compression

Producer gas is generally made from coke, or other carbonaceous material such as anthracite. Air is passed over the red-hot carbonaceous fuel and carbon monoxide is produced.

Water gas is produced by Passing steam over incandescent coke

-In a two stage reciprocating air compressor with complete intercooling, maximum work is saved -The minimum work required for a two stage reciprocating air compressor is double the work required for each stage -The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency

-Increase the turbine inlet temperature provided the turbine materials can stand the temperature or one has access to replacement parts that can withstand the temperatures. -Increase the pressure ratio. There is a limit to the efficiency increase depending upon the turbine inlet temperature. One can concievably increase the pressure ratio to a point that the increased work is never recovered because the expansion across the turbine is inadequate to recover the work. - Power augmentation through steam injection. -On turbines with HP and LP turbine separated, apply reheat.

The gas in cooling chamber of a closed cycle gas turbine is cooled at constant pressure

In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in Turbine blades, which is essentially an isentropic process

Gas turbine as compared to internal combustion engine - Can be driven at a very high speed - Produces uniform torque -Has more efficiency