PASGT Quiz

Considering their high initial cost and lower efficiency compared to diesel engines, in which of the following scenarios would the use of marine gas turbines be most justified?

• A small, slow-moving cargo ship

• A high-speed ferry operating in a competitive market

• A large tanker vessel for long-distance transportation

• A fishing boat operating in coastal waters

Marine gas turbines are increasingly being used in commercial ships in combination with diesel engines. What is the primary reason for this combination?

• To improve fuel efficiency at all operating speeds

• To reduce the overall weight of the propulsion system

• To optimize performance for different operating conditions

• To comply with stricter emission regulations

Which of the following is NOT a characteristic of gas turbines?

• High power-to-weight ratio

• Rapid acceleration

• High efficiency at part load

• Low vibration

What is the graphical representation of a gas turbine's thermodynamic cycle called?

• TS diagram

• PV diagram

• PH diagram

• VH diagram

Which of the following statements accurately describes the working principle of a gas turbine?

• Fuel is ignited in a piston cylinder, creating a force that rotates a crankshaft.

• Air is continuously compressed, mixed with fuel, burned, and expanded through a turbine to generate power.

• Steam generated in a boiler drives a turbine to produce mechanical work.

• Solar radiation is converted into electricity through photovoltaic cells.

The P-T diagram for the Brayton cycle shows an upward-sloping line for the compression process (1-2). What does this slope signify?

• The pressure remains constant while the temperature increases.

• The pressure and temperature increase proportionally.

• The pressure increases with a decrease in temperature.

• The temperature increases more rapidly than the pressure.

What is the primary function of a compressor in a gas turbine?

• To generate electricity

• To increase the pressure of incoming air

• To ignite the fuel

• To convert mechanical energy into electrical energy

What is the main purpose of fuel injection in a gas turbine combustion chamber?

• To cool the hot gas

• To create a spark for ignition

• To efficiently mix fuel with compressed air

• To regulate the turbine speed

What is the role of an anti-icing system in a gas turbine inlet?

• To regulate the fuel flow

• To prevent ice formation in cold climates

• To increase the pressure of the incoming air

• To cool the compressed air

What is the purpose of an intercooler in a gas turbine system?

• To filter contaminants from the lubricating oil

• To reduce the air temperature between compression stages for improved efficiency

• To direct the high-pressure gas onto the turbine blades

• To control the exhaust gas flow