3B2 - Ultimate ABSA Study Guide C1-15 UPDATED ACTUAL Questions and
CORRECT Answers
Turbine nozzles convert heat energy into: D
a. Potential energy.
b. Enthalpy.
c. Eddy-currents.
d. Kinetic energy.
e. Pressure.
Labyrinth seals are: D
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.
Flange warming on a steam turbine B
decreases:
a. Creep.
b. Start up time.
c. Movement.
d. Radiation losses.
e. Noises.
,In pressure compound steam turbines: D
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.
In a/an ___ turbine there is a difference in C
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.
The pressure at the outlet from the moving D
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.
When disc rotors are assembled, the discs C
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.
, In an impulse steam turbine nozzle the E
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
A turbine that expands the steam in two or D
more sets of nozzles in series, each set
having velocity-compounded blades to
receive the steam issuing from the nozzles
is called a/an:
a. Extraction turbine.
b. Velocity compounded turbine.
c. Pressure compounded turbine.
d. Pressure-velocity compounded turbine.
e. Mixed-pressure turbine.
In a back-pressure turbine the process A
steam pressure is:
a. Kept constant and the generator output
depends on the demand for process
steam.
b. Varied and the generator output remains
constant.
c. Kept constant and the generator output
remains constant.
d. Not important.
e. Dependant on the generator output.
Extraction turbines are turbines where B
steam is extracted at one or more points at
constant:
a. Flow.
b. Pressure.
c. Load.
d. Temperature.
e. Efficiency.
___ turbines are large turbines with parallel E
shafts with a generator on each shaft.
a. Condensing.
b. Tandem-compound.
c. Extraction-bleeder.
d. Condensing-bleeder.
e. Cross-compound.
CORRECT Answers
Turbine nozzles convert heat energy into: D
a. Potential energy.
b. Enthalpy.
c. Eddy-currents.
d. Kinetic energy.
e. Pressure.
Labyrinth seals are: D
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.
Flange warming on a steam turbine B
decreases:
a. Creep.
b. Start up time.
c. Movement.
d. Radiation losses.
e. Noises.
,In pressure compound steam turbines: D
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.
In a/an ___ turbine there is a difference in C
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.
The pressure at the outlet from the moving D
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.
When disc rotors are assembled, the discs C
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.
, In an impulse steam turbine nozzle the E
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
A turbine that expands the steam in two or D
more sets of nozzles in series, each set
having velocity-compounded blades to
receive the steam issuing from the nozzles
is called a/an:
a. Extraction turbine.
b. Velocity compounded turbine.
c. Pressure compounded turbine.
d. Pressure-velocity compounded turbine.
e. Mixed-pressure turbine.
In a back-pressure turbine the process A
steam pressure is:
a. Kept constant and the generator output
depends on the demand for process
steam.
b. Varied and the generator output remains
constant.
c. Kept constant and the generator output
remains constant.
d. Not important.
e. Dependant on the generator output.
Extraction turbines are turbines where B
steam is extracted at one or more points at
constant:
a. Flow.
b. Pressure.
c. Load.
d. Temperature.
e. Efficiency.
___ turbines are large turbines with parallel E
shafts with a generator on each shaft.
a. Condensing.
b. Tandem-compound.
c. Extraction-bleeder.
d. Condensing-bleeder.
e. Cross-compound.
