Types of Steam Turbine: Quiz and Flashcards

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Questions and Answers

In which direction does the steam flow in most steam turbines?

Axial direction (correct)

Radial direction

Vertical direction

Horizontal direction

What is the basic principle of operation for steam turbines?

Converting mechanical energy to heat energy

Using steam to cool down shaft-mounted disks

Converting heat energy to mechanical energy (correct)

Directing high velocity air onto shaft-mounted disks

How does the expansion and pressure drop occur in an impulse turbine?

Both through stationary and moving nozzles

Through moving nozzles only

There is no expansion and pressure drop in an impulse turbine

Through stationary nozzles only (correct)

What creates the steam passages shaped like bent nozzles in a reaction turbine?

Both stationary and moving nozzles Signup and view all the answers

Which type of turbine has expansion and pressure drop occur through both stationary and moving nozzles?

Reaction turbine Signup and view all the answers

What type of turbine has the steam flowing in the radial direction around the shaft?

Radial turbine Signup and view all the answers

What is the function of the stationary passage (stator) in an impulse turbine?

To create high velocity steam jets Signup and view all the answers

What is the main function of the nozzles in a steam turbine?

To direct the flow of high-pressure steam onto the rotor blades Signup and view all the answers

Which type of turbine uses stationary nozzle-shaped blades to direct steam into moving nozzle-shaped blades?

Reaction turbine Signup and view all the answers

What is the purpose of blade shrouding in a steam turbine?

To confine steam to the blade passage and stiffen the blades against vibration Signup and view all the answers

What is the main function of the condenser in a steam power plant?

To transform steam back into water and provide a clean source of boiler feedwater Signup and view all the answers

In which section of a steam turbine does the velocity of steam decrease while pressure remains constant?

Impulse rotors Signup and view all the answers

What is the purpose of the sealing glands in a steam turbine?

To hold carbon segments against the shaft and prevent steam leakage Signup and view all the answers

What are the bearings in a steam turbine primarily designed to do?

Serve as a combined thrust and journal bearing Signup and view all the answers

What is the main purpose of the stationary nozzles in a steam turbine?

To direct high-pressure steam onto the rotor blades Signup and view all the answers

Study Notes

Steam Turbine Operation

Steam flow direction in most steam turbines: axial direction

Turbine Principles

Basic principle of operation for steam turbines: conversion of thermal energy into mechanical energy

Impulse Turbine

Expansion and pressure drop occur: through stationary nozzle (stator) and then moving blades
Function of the stationary passage (stator): to increase steam velocity and pressure drop

Reaction Turbine

Steam passages shaped like bent nozzles created by: diagonal orientation of stationary blades
Type of turbine with expansion and pressure drop through both stationary and moving nozzles: reaction turbine

Radial Flow Turbine

Type of turbine with steam flowing in the radial direction around the shaft: radial flow turbine

Nozzle Function

Main function of the nozzles: to direct steam into moving blades and increase velocity
Type of turbine using stationary nozzle-shaped blades to direct steam into moving nozzle-shaped blades: impulse turbine

Blade Shrouding

Purpose of blade shrouding: to minimize steam leakage and reduce energy loss

Condenser Function

Main function of the condenser: to condense steam back into liquid water in a steam power plant

Turbine Sections

Section where velocity of steam decreases while pressure remains constant: diffuser section

Sealing Glands

Purpose of the sealing glands: to prevent steam leakage and maintain pressure

Bearing Function

Bearings in a steam turbine primarily designed to: reduce friction and support moving parts

Stationary Nozzles

Main purpose of the stationary nozzles: to increase steam velocity and pressure drop

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Description

Learn about the types and operation of steam turbines, which convert heat energy into mechanical energy through the use of high velocity steam and shaft-mounted blades. Understand the differences between impulse and reaction turbines and the direction of steam flow in these machines.