POWER ENGINEERING 3B2 - CHAPTER
1 EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
In an impulse steam turbine nozzle, the following events take place:
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 - ANS D
Turbine nozzles convert heat energy into:
a. Potential energy
b. Enthalpy
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,c. Eddy-currents
d. Kinetic energy
e. Pressure - ANS D
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 - ANS C
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 - ANS A
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
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,c. a back-pressure
d. an impulse
e. an extraction - ANS D
Steam turbine stationary nozzles serve to:
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 - ANS C
On an extraction turbine the extraction pressure is:
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 - ANS C
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, A back-pressure turbine which exhausts steam to an old boiler header still supplying steam to
an old lower pressure turbine is called:
a. Condensing-bleeder turbine
b. Cross compound turbine
c. Condensing turbine
d. Topping turbine
e. Mixed pressure turbine - ANS D
A topping turbine is a special application of a ________ turbine.
a. condensing
b. extraction
c. condensing-bleeder
d. tandem compound
e. back-pressure - ANS E
_____________ 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 - ANS B
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
1 EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
In an impulse steam turbine nozzle, the following events take place:
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 - ANS D
Turbine nozzles convert heat energy into:
a. Potential energy
b. Enthalpy
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,c. Eddy-currents
d. Kinetic energy
e. Pressure - ANS D
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 - ANS C
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 - ANS A
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
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,c. a back-pressure
d. an impulse
e. an extraction - ANS D
Steam turbine stationary nozzles serve to:
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 - ANS C
On an extraction turbine the extraction pressure is:
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 - ANS C
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, A back-pressure turbine which exhausts steam to an old boiler header still supplying steam to
an old lower pressure turbine is called:
a. Condensing-bleeder turbine
b. Cross compound turbine
c. Condensing turbine
d. Topping turbine
e. Mixed pressure turbine - ANS D
A topping turbine is a special application of a ________ turbine.
a. condensing
b. extraction
c. condensing-bleeder
d. tandem compound
e. back-pressure - ANS E
_____________ 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 - ANS B
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
