There are ________ types of Gas Turbines.

Question

Question

This question was previously asked in

RRB ALP Mechanic Diesel 21 Jan 2019 Official Paper (Shift 1)

Answer 1

Explanation:
Gas turbine:

A gas turbine is a continuous-combustion, internal combustion engine.
There are three main components:
- Gas compressor
- Turbine on the same shaft
- Combustion chamber
There are four types of gas turbine engines used to propel and power aircraft. They are:
- Turbojet
- Turbofan
- Turboprop
- Turboshaft.
The basic operation of the gas turbine is a Brayton cycle.
Fresh atmospheric air flows through the compressor which brings it to higher pressure.
Energy is then added by spraying fuel into the air and igniting it.
So the combustion generates a high temperature and pressure.
This high-temperature high-pressure gas enters a turbine, where it expands.
This produces a shaft work output in the process.
The turbine shaft work is used to drive the compressor.
The energy that can also be (not used for shaft work comes out in the exhaust gases) produce thrust which is used to push aircraft.
The purpose of the gas turbine determines the design so that the most desirable split of energy between the thrust and the shaft work is achieved.
Separate cooling system is not required as gas turbines are open systems that do not use the same air again.
Gas turbines are used to power aircraft, trains, ships, electrical generators, pumps, gas compressors, and military war tanks.