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Gas Turbines: Heat Engine and Prime Mover Quiz

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Questions and Answers

What primarily determines the efficiency of a gas turbine?

The rotational speed of the compressor
The number of turbines it has
The type of load it drives
The temperature to which the air can be raised before it enters the turbine (correct)

In what way does cold air at the compressor intake affect gas turbine output?

It produces a marked increase in gas turbine output (correct)
It decreases gas turbine output
It causes a slight decrease in gas turbine output
It has no effect on gas turbine output

What type of gas turbines are derived from the jet engines used in aircrafts?

Heavy-duty gas turbines
Stationary gas turbines
Aeroderivative gas turbines (correct)
Industrial gas turbines

What drives the propeller in the typical turboprop aircraft engine?

Reduction gears driven by the second turbine (C) Signup and view all the answers

What is used to deliver a considerable amount of useful power in the heavy-duty gas turbine?

Multiple rows of blades in the gas turbine (C) Signup and view all the answers

What is the role of the fuel in a gas turbine?

To add heat to the compressed air (A) Signup and view all the answers

Why were early gas turbines handicapped in industry?

Lack of suitable metals to withstand high temperatures (A) Signup and view all the answers

What is the main reason for essentially all of the turbine output being used to run the compressor in early gas turbines?

Inability to produce profitable net power output (B) Signup and view all the answers

In which field is the gas turbine supreme today?

Aircraft propulsion (A) Signup and view all the answers

What is the construction of a simple gas turbine?

Compressor attached to a turbine with a combustion chamber between them (D) Signup and view all the answers

What is the purpose of rotating the gas turbine at 20 to 30% of its maximum speed before turning on the fuel?

To provide sufficient air compression for driving the compressor when fuel is injected (B) Signup and view all the answers

What is the significance of the starting motor in a gas turbine?

It is essential for rotating the gas turbine to achieve sufficient air compression before fuel injection (B) Signup and view all the answers

What distinguishes a simple gas turbine from other types of gas turbines?

It has no heat exchanger, regenerators, or intercoolers (D) Signup and view all the answers

What defines an open-cycle gas turbine?

It draws air from the atmosphere for driving the turbine and returns it after use (B) Signup and view all the answers

What is the defining feature of a single shaft gas turbine?

The gas turbine and compressor are mechanically coupled on the same shaft (C) Signup and view all the answers

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