MARE165 REVIEW!

A machine delivering mechanical power or thrust. It does this using a gaseous working fluid.

• Gas Turbine

• Steam Turbine

• Wind Turbine

• Water Turbine

The outgoing gaseous fluid can be used to generate _. In the gas turbine, there is a continuous flow of the working fluid.

• fluid

• thrust

• air

• money

Efficiency of the Gas turbine is _ to _%, whereas that of steam power plant is 38 To 48%

• 20 to 30%

• 69 to 96%

• 10-20%

• 40-70%

_ gases move through a multistage gas turbine

• hot

• cold

• steam

• sleeping

The stationary blades guide the moving gases to the

• rotor blades

• air compressor

• combustion chamber

• bunganga mo

The shaft of the turbine is coupled to a

• generator

• compressor

• turbocharger

• piston

Which of the principles of a Gas Turbine is correct? (Choose all the correct answer)

• Air is compressed(squeezed) to high pressure by a compressor.

• Then fuel and compressed air are mixed in a combustion chamber and ignited.

• Gas turbines burn fuels such as oil, natural gas andpulverized(powdered) coal.

• Hot gases are given off, which spin the turbine wheels.

• While the engine drives the generator, the latter generates a voltage that is delivered to the user through a socket.

Three Main Parts of a Marine Gas Turbine

(Choose all the correct answer)

• Air compressor

• Combustion chamber

• Turbine

• Fuel Injector

• Exhaust

Advantages of Gas Turbine, choose the correct answers

• Storage of fuel requires less area and handling is easy.

• Cheaper fuel such as kerosene, paraffin, benzene and powdered coal can be used which are cheaper than petrol and diesel.

• It is simple in construction. There is no need for boiler, condenser and other accessories as in the case of steam power plants.

• Gas turbine plants can be used in water scarcity areas.

• Less pollution and less water is required. The cost of maintenance is less.

Disadvantages of Gas Turbine

(Choose the correct answers)

• 66% of the power developed is used to drive the compressor.Therefore the gas turbine unit has a low thermal efficiency.

• The running speed of gas turbine is in the range of (40,000 to100,000 rpm) and the operating temperature is as high as 1100– 12600C. For this reason, special metals and alloys have to be used for the various parts of the turbine. HABA AMPUTA BASAHIN NYO HAHAHA

• High frequency noise from the compressor is objectionable.

• The cost of maintenance is less.

• Less pollution and less water is required.