comprehension and application of core concepts. We will also discuss the similarities and differences
3B2 - Ultimate ABSA Study Guide C1-15 Questions
and answers EXAM, SOLUTIONS (MULTIPLE CHOICES)
100% correct 2025!!
Turbine nozzles convert heat energy into:
a. Potential energy.
b. Enthalpy.
c. Eddy-currents.
d. Kinetic energy.
e. Pressure. - (ANSWER)D
Labyrinth seals are:
1. Made of cast iron.
2. A positive leak-proof seal arrangement.
3. Design to have large clearances between the shaft and casing.
4. Made of brass or stainless steel.
5. Used on larger diameter turbine shafts.
a. 1, 2.
b. 2, 4, 5.
c. 3, 4, 5.
d. 4, 5.
e. 1, 2, 3. - (ANSWER)D
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Flange warming on a steam turbine decreases:
a. Creep.
b. Start up time.
c. Movement.
d. Radiation losses.
e. Noises. - (ANSWER)B
In pressure compound steam turbines:
1. The expansion of steam from boiler pressure to exhaust
pressure is carried out in a number of steps or stages.
2. Each stage has a set of nozzles and a row of blades.
3. All of the velocity available is developed in one set of nozzles.
4. Rows of moving blades are separated by partitions or
diaphragms into which nozzles have been installed.
a. 1,2,3.
b. 2,3,4
c. 1,3,4
d. 2,4
e. 2,3,4. - (ANSWER)D
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In a/an turbine there is a difference in pressure across the blades.
Therefore the steam will tend to around the periphery of the blades
instead of passing through them.
1. Impulse.
2. Moving.
3. Reaction.
4. Drip.
5. Stationary.
6. Leak.
a. 1,2,4.
b. 3,5,6.
c. 3,2,6.
d. 1,5,4.
e. 1,5,6. - (ANSWER)C
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.
a. Topping.
b. Reaction.
c. Back pressure.
d. Impulse.
e. Extraction. - (ANSWER)D
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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:
a. Noise.
b. Slippage.
c. Thermal stress in the shaft.
d. Acceleration.
e. Vibration. - (ANSWER)C
In an impulse steam turbine nozzle the following events take place:
1. Steam pressure decreases
2. Enthalpy of the steam decreases
3. Velocity of the steam increases
4. Volume of the steam increases
a. 1,2,4
b. 1,3,4
c. 2,3,4
d. 1,2,3
e. 1,2,3,4 - (ANSWER)E