Arbortext 3B2 User Guide: Advanced Publishing & Typesetting Tutorials

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3B2 - Ultimate ABSA Exam and Study Guide C1-15

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A dummy piston is used on a steam turbine to: .....ANSWER.....

Counter end thrust

The entrance angle of a reaction blade is: .....ANSWER..... Almost

90 degrees

To ensure a tight seal, a steam turbine balance piston is fitted

with _____. .....ANSWER..... Labyrinth seals

Extraction turbines are turbines where steam is extracted at one

or more points at constant: .....ANSWER..... Pressure

In a steam turbine having pressure drop across the moving

blades, an unbalanced _____ thrust will be developed upon the

rotor. .....ANSWER..... Axial

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All large disc rotors are machined from __________ steel:

.....ANSWER..... A solid forging of nickel steel.

Convergent-divergent nozzles are used when: .....ANSWER.....

High pressure drops are required

During start up of a steam turbine the thrust block is pushed

against a stop in the direction of the exhaust for: .....ANSWER.....

Maximum blade clearance

In a steam turbine using velocity compounding _____ expand(s)

the steam from initial to exhaust pressure. .....ANSWER..... One

set of nozzles

A thrust adjusting gear: .....ANSWER..... Positions the turbine rotor

axially

A hollow drum rotor of a steam turbine is machined both outside

and inside. How is the drum end cover with shaft installed in the

rotor? .....ANSWER..... Shrink fitted and welded

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Steam turbine casing joints are made steam tight by matching

_____ exactly. .....ANSWER..... Flange faces

A back-pressure turbine with exhaust steam going to an old

boiler header that is supplying steam to an old lower pressure

turbine is called a: .....ANSWER..... Topping turbine

A reaction turbine has: .....ANSWER..... Rows of stationary blades

alternating with rows of moving blades

When disc rotors are assembled, the discs are heated until they

are easily slid along the shaft and then located in the correct

position on the shaft and shaft key. A small clearance between

the discs prevents: .....ANSWER..... Thermal stress in the shaft

The purpose of compounding in a steam turbine is to:

.....ANSWER..... Reduce steam and blade velocity

On larger turbines the _____ is split in a horizontal direction.

.....ANSWER..... Cylinder

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The pressure at the outlet from the moving blades is the same as

the pressure at the inlet to the moving blades in a/an

__________ turbine. .....ANSWER..... Impulse

In a condensing-bleeder turbine up to 2% of the total steam flow

may be bled off. What is the bleed-steam used for?

.....ANSWER..... Feed-water heating

It is general practice to let the thickness of the walls and flanges

_____ from inlet to exhaust end of a steam turbine casing:

.....ANSWER..... Decrease

A water seal is used on some steam turbines ________ to insure

that no air leaks in along the shaft: .....ANSWER..... At speeds

above 2000 rev/mm

If a turbine is shut down and left at a standstill while still hot, the

lower half of the rotor will cool faster than the upper half. The

rotor will "hog", which means it will ___________. .....ANSWER.....

Bend upwards