gas turbine assembly

#1. The effect on the temperature and pressure of the gases as they pass across the turbine is:

• ATheir temperature decreases and their pressure rises.
• BBoth their temperature and pressure increase.
• CBoth their temperature and pressure decrease.
• DTheir temperature increases and their pressure falls.

#2. Nozzle guide vanes are fitted before the turbine:

• ATo increase the velocity of the airflow.
• BTo decrease the velocity of the gas flow therefore increasing its pressure.
• CTo increase the velocity of the gas flow therefore reducing its pressure.
• DTo increase the temperature of the gas flow.

#3. One reason for shrouding turbine blades is:

• ATo reduce “creep” which may occur in the blades.
• BTo improve efficiency and reduce vibration.
• CTo enable thinner blades to be used.
• DTo minimise blade end erosion.