PPS last Prelim Exam

What is the primary function of a steam turbine?

• To cool steam

• To condense steam

• To store thermal energy

• To convert thermal energy into mechanical work

Which component of a steam turbine carries the blades?

• Shaft

• Rotor

• Nozzles

• Casing

What type of turbine uses both pressure and reaction force for energy extraction?

• Radial Turbine

• Impulse Turbine

• Reaction Turbine

• Axial Turbine

Which type of steam turbine is characterized by high rotational speed?

• Impulse Turbine

• Non-condensing Turbine

• Condensing Turbine

• Reaction Turbine

What is the main principle of operation for an impulse turbine?

• Steam flows radially outward

• Steam is condensed to create a vacuum

• Steam expands completely in the nozzles

• Steam expands partially in the nozzles

Which type of turbine is more commonly used in hydroelectric power generation?

• Multi-shaft Turbine

• Single-shaft Turbine

• Reaction Turbine

• Impulse Turbine

What is a characteristic of reaction turbines?

• Higher efficiency than impulse turbines for the same pressure drop

• Fewer stages compared to impulse turbines

• Lower efficiency than impulse turbines for the same pressure drop

• Simple construction

What does the casing of a steam turbine do?

• Supports the rotor

• Connects the rotor to the generator

• Houses the rotor and blades

• Directs steam onto the blades

Which of the following is NOT a component of a steam turbine?

• Shaft

• Compressor

• Casing

• Blades

What is the role of nozzles in a steam turbine?

• To support the rotor

• To connect the rotor to the generator

• To house the rotor

• To direct high-pressure steam onto the blades