Chapter 1 Flashcards
The distinguishing feature of a reaction turbine is the fact that the pressure drops across the _________ blades.
A) Moving
B) Sectional
C) Angular
D) Cutting
E) Stationary
A
In a steam turbine that has pressure drop across the moving blades, an unbalanced ____________ thrust will be developed.
A) Rotational
B) Axial
C) Centrifugal
D) Radial
E) Impulse
B
A steam turbine assembled casing is machined off inside in a boring mill to:
- Make grooves for shaft seals
- Make grooves for diaphragms
- Machine bearings housings
- Create root grooves for rotating blades
A) 1, 3
B) 1, 2, 4
C) 2, 3, 4
D) 1, 2, 3
E) 1, 4
D
The axial thrust in impulse turbines is nearly eliminated by use of a balance or dummy piston.
A) True
B) False
B
In a reaction turbine, the steam pressure drops across both the fixed and moving blades while the steam’s ____________ velocity increases in the stationary blades and decreases in the moving blades.
A) Moving
B) Absolute
C) Primary
D) Secondary
E) Stationary
B
A condensing-bleeder turbine can bleed up to __________ of the total steam flow.
A) 30%
B) 20%
C) 15%
D) 25%
E) 10%
B
A back-pressure turbine that uses steam from a HP supply header, while supplying steam to a lower pressure header, that is supplying steam to a low pressure turbine is called:
A) A cross compound turbine
B) A condensing-bleeder turbine
C) A mixed pressure turbine
D) A topping turbine
E) A condensing turbine
D
____________ turbines are large turbines consisting of two or more turbines in series, coupled together as one shaft and applied to one generator.
A) Mixed pressure
B) Condensing-bleeder
C) Tandem-compound
D) Cross-compound
E) Topping
C
On an extraction turbine, the extraction pressure is:
A) Reduced if load increases
B) Varied according to turbine load
C) Chosen for a specific process purpose
D) Not critical
E) Proportional to the turbine load
C
A steam turbine balance (dummy) piston is fitted with a __________ to ensure a tight seal.
A) Blade seal
B) Diaphragm
C) Carbon ring seal
D) Labyrinth seal
E) Water seal
D
