Power Engineering 3B2 - Chapter 1 UPDATED ACTUAL Questions and
CORRECT Answers
Question: In an impulse steam turbine nozzle, the following events take place
Correct Answer: 1) The steam pressure decreases 2) The enthalpy of the steam decreases 3) The velocity
of the steam increases 4) The volume of the steam increases a. 1, 2, 4 b. 1, 3, 4 c. 2, 3, 4 d. 1, 2, 3, 4 e. 1, 2,
3: D
Question: Turbine nozzles convert heat energy into
Correct Answer: a. Potential energy b. Enthalpy c. Eddy-currents d. Kinetic energy e. Pressure: D
Question: The purpose of the bucket or moving blade on the rotor is to convert the ____________ energy
of the steam into ________ energy. a. heat, potential b. kinetic, useful c. kinetic, mechanical d. heat, kinetic
e. mechanical, kinetic
Correct Answer: C
Question: In an impulse turbine as the steam passes through the moving blades the ________ drops but the
______ remains the same. a. velocity, pressure b. enthalpy, velocity c. pressure, velocity d. volume, velocity
e. velocity, kinetic energy
Correct Answer: A
Question: The pressure at the outlet from the moving blades is the same as the pressure at the inlet to the
moving blades in __________ turbine. a. a topping b. a reaction c. a back-pressure d. an impulse e. an
extraction
Correct Answer: D
Question: Steam turbine stationary nozzles serve to
Correct Answer: 1) Decrease steam pressure 2) Increase steam enthalpy 3) Decrease steam friction 4)
Increase steam velocity a. 1, 2, 3 b. 1, 3, 4 c. 1, 4 d. 2, 3 e. 2, 3, 4: C
Question: On an extraction turbine the extraction pressure is
Correct Answer: a. Not critical b. Varied according to turbine load c. Maintained constant regardless of
turbine load d. Proportional to the turbine load e. Reduced if load increases: C
Question: A back-pressure turbine which exhausts steam to an old boiler header still supplying steam to an
old lower pressure turbine is called
Correct Answer: a. Condensing-bleeder turbine b. Cross compound turbine c. Condensing turbine d.
Topping turbine e. Mixed pressure turbine: D
Question: A topping turbine is a special application of a ________ turbine. a. condensing b. extraction c.
condensing-bleeder d. tandem compound e. back-pressure
Correct Answer: E
Question: _____________ turbines are large turbines consisting of two or more turbines in series coupled
together as one shaft and applied to one generator. a. Topping b. Tandem-compound c. Condensing-bleeder
d. Cross-compound e. Mixed pressure
Correct Answer: B
, Question: A generator coupled on one shaft to a turbine consisting of two or more turbine in series is
called? a. Condensing-bleeder b. Cross-compound turbine c. Mixed pressure d. Tandem-compound turbine
e. Topping
Correct Answer: D
Question: __________________ turbines are large turbines with parallel shafts with a generator on each
shaft. a. Condensing b. Tandem-compound c. Extraction-bleeder d. Condensing-bleeder e. Cross-compound
Correct Answer: E
Question: In a reaction turbine the steam pressure drops across both the fixed and moving blades while the
steam's ______ velocity rises in the fixed blades and drops in the moving blades. a. secondary b. primary c.
stationary d. moving e. absolute
Correct Answer: E Absolute velocity is the velocity of the steam relative to the moving blades
Question: The distinguishing feature of a reaction turbine is the fact that the pressure drop across the
_________ blades. a. cutting b. moving c. sectional d. stationary e. angular
Correct Answer: B
Question: In a steam turbine having pressure drop across the moving blades, an unbalanced ________
thrust will be developed upon the rotor. a. axial b. centrifugal c. radial d. impulse e. rotational
Correct Answer: A
Question: Reaction turbine blades (moving)
Correct Answer: 1) Convert the kinetic energy of the steam into mechanical energy 2) Convert heat energy
into kinetic energy 3) Are nozzle shaped 4) Increase the absolute velocity a. 1, 2, 3 b. 2, 3, 4 c. 1, 3, 4 d. 1,
2, 4 e. 1, 4: A
Question: A reaction turbine results in a long machine due to a large number of alternate rows of
Correct Answer: a. Nozzles and moving blades b. Nozzles and stationary blades c. Fixed and moving
blades d. Stationary blades e. Moving blades and nozzles: C
Question: A turbine that expands the steam in two or more sets of nozzles in series, each set having
velocity-compounded blades to receive the steam issuing from the nozzles is called
Correct Answer: a. Extraction turbine b. Velocity compounded turbine c. Pressure compounded turbine d.
Pressure-velocity compounded turbine e. Mixed-pressure turbine: D
Question: In pressure compound steam turbine
Correct Answer: 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) The rows of moving blades are separated from each other by
partitions or diaphragms into which the nozzles are set a. 1, 2, 3 b. 2, 3, 4 c. 1, 3, 4 d. 1, 2, 4 e. 1, 2, 3, 4: D
Question: In a steam turbine using velocity compounding _____________ expand the steam from initial to
exhaust pressure. a. two sets of nozzles and moving blades b. stationary blades c. stationary and moving
blades d. moving blades e. stationary inlet nozzles
Correct Answer: E
Question: In a condensing-bleeder turbine up to 20% of the total steam flow may be bled off. What is the
bleed-steam used for. a. Building heating b. Relieving pressure c. Atomization of the fuel d. To be reheated
CORRECT Answers
Question: In an impulse steam turbine nozzle, the following events take place
Correct Answer: 1) The steam pressure decreases 2) The enthalpy of the steam decreases 3) The velocity
of the steam increases 4) The volume of the steam increases a. 1, 2, 4 b. 1, 3, 4 c. 2, 3, 4 d. 1, 2, 3, 4 e. 1, 2,
3: D
Question: Turbine nozzles convert heat energy into
Correct Answer: a. Potential energy b. Enthalpy c. Eddy-currents d. Kinetic energy e. Pressure: D
Question: The purpose of the bucket or moving blade on the rotor is to convert the ____________ energy
of the steam into ________ energy. a. heat, potential b. kinetic, useful c. kinetic, mechanical d. heat, kinetic
e. mechanical, kinetic
Correct Answer: C
Question: In an impulse turbine as the steam passes through the moving blades the ________ drops but the
______ remains the same. a. velocity, pressure b. enthalpy, velocity c. pressure, velocity d. volume, velocity
e. velocity, kinetic energy
Correct Answer: A
Question: The pressure at the outlet from the moving blades is the same as the pressure at the inlet to the
moving blades in __________ turbine. a. a topping b. a reaction c. a back-pressure d. an impulse e. an
extraction
Correct Answer: D
Question: Steam turbine stationary nozzles serve to
Correct Answer: 1) Decrease steam pressure 2) Increase steam enthalpy 3) Decrease steam friction 4)
Increase steam velocity a. 1, 2, 3 b. 1, 3, 4 c. 1, 4 d. 2, 3 e. 2, 3, 4: C
Question: On an extraction turbine the extraction pressure is
Correct Answer: a. Not critical b. Varied according to turbine load c. Maintained constant regardless of
turbine load d. Proportional to the turbine load e. Reduced if load increases: C
Question: A back-pressure turbine which exhausts steam to an old boiler header still supplying steam to an
old lower pressure turbine is called
Correct Answer: a. Condensing-bleeder turbine b. Cross compound turbine c. Condensing turbine d.
Topping turbine e. Mixed pressure turbine: D
Question: A topping turbine is a special application of a ________ turbine. a. condensing b. extraction c.
condensing-bleeder d. tandem compound e. back-pressure
Correct Answer: E
Question: _____________ turbines are large turbines consisting of two or more turbines in series coupled
together as one shaft and applied to one generator. a. Topping b. Tandem-compound c. Condensing-bleeder
d. Cross-compound e. Mixed pressure
Correct Answer: B
, Question: A generator coupled on one shaft to a turbine consisting of two or more turbine in series is
called? a. Condensing-bleeder b. Cross-compound turbine c. Mixed pressure d. Tandem-compound turbine
e. Topping
Correct Answer: D
Question: __________________ turbines are large turbines with parallel shafts with a generator on each
shaft. a. Condensing b. Tandem-compound c. Extraction-bleeder d. Condensing-bleeder e. Cross-compound
Correct Answer: E
Question: In a reaction turbine the steam pressure drops across both the fixed and moving blades while the
steam's ______ velocity rises in the fixed blades and drops in the moving blades. a. secondary b. primary c.
stationary d. moving e. absolute
Correct Answer: E Absolute velocity is the velocity of the steam relative to the moving blades
Question: The distinguishing feature of a reaction turbine is the fact that the pressure drop across the
_________ blades. a. cutting b. moving c. sectional d. stationary e. angular
Correct Answer: B
Question: In a steam turbine having pressure drop across the moving blades, an unbalanced ________
thrust will be developed upon the rotor. a. axial b. centrifugal c. radial d. impulse e. rotational
Correct Answer: A
Question: Reaction turbine blades (moving)
Correct Answer: 1) Convert the kinetic energy of the steam into mechanical energy 2) Convert heat energy
into kinetic energy 3) Are nozzle shaped 4) Increase the absolute velocity a. 1, 2, 3 b. 2, 3, 4 c. 1, 3, 4 d. 1,
2, 4 e. 1, 4: A
Question: A reaction turbine results in a long machine due to a large number of alternate rows of
Correct Answer: a. Nozzles and moving blades b. Nozzles and stationary blades c. Fixed and moving
blades d. Stationary blades e. Moving blades and nozzles: C
Question: A turbine that expands the steam in two or more sets of nozzles in series, each set having
velocity-compounded blades to receive the steam issuing from the nozzles is called
Correct Answer: a. Extraction turbine b. Velocity compounded turbine c. Pressure compounded turbine d.
Pressure-velocity compounded turbine e. Mixed-pressure turbine: D
Question: In pressure compound steam turbine
Correct Answer: 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) The rows of moving blades are separated from each other by
partitions or diaphragms into which the nozzles are set a. 1, 2, 3 b. 2, 3, 4 c. 1, 3, 4 d. 1, 2, 4 e. 1, 2, 3, 4: D
Question: In a steam turbine using velocity compounding _____________ expand the steam from initial to
exhaust pressure. a. two sets of nozzles and moving blades b. stationary blades c. stationary and moving
blades d. moving blades e. stationary inlet nozzles
Correct Answer: E
Question: In a condensing-bleeder turbine up to 20% of the total steam flow may be bled off. What is the
bleed-steam used for. a. Building heating b. Relieving pressure c. Atomization of the fuel d. To be reheated
