ABSA 3B2 Power Engineering Exam questions with
verified answers
_____________ 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
__________________ 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 Ans✓✓✓ e
A back-pressure turbine which exhaust steam to an old boiler header still
supplying 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 balance piston on a steam turbine is used to:
a. Counteract vibration and therefore ensure a smooth running unit
b. Increase turbine output
c. Measure axial position
d. Counteract end thrust
e. Provide an area to install a labyrinth seal Ans✓✓✓ d
A barring gear consists of an electric motor and several sets of reducing
gears to turn the turbine shaft at a low speed. It is used:
1) After stopping a hot turbine to prevent "hogging"
2) Only on small turbine
3) Continually when the turbine is not operating
4) Prior to start-up for approximately 3 hours
a. 1, 2, 4
b. 1, 2, 3
c. 1, 4
d. 2, 3
e. 2, 4 Ans✓✓✓ c
, A condensing-bleeder turbine can bleed up to ______ of the total steam
flow.
a. 0.1
b. 0.15
c. 0.2
d. 0.25
e. 0.3 Ans✓✓✓ c
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 Ans✓✓✓ d
A Hollow Drum Rotor, for good balance, is machined both outside and
inside thus the drum must be open at one end. How is the drum end
cover with shaft installed in the rotor?
a. Press fitted
b. Welded on
c. Bolted
d. Press fit and belted
e. Shrink fit and welded Ans✓✓✓ e
verified answers
_____________ 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
__________________ 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 Ans✓✓✓ e
A back-pressure turbine which exhaust steam to an old boiler header still
supplying 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 balance piston on a steam turbine is used to:
a. Counteract vibration and therefore ensure a smooth running unit
b. Increase turbine output
c. Measure axial position
d. Counteract end thrust
e. Provide an area to install a labyrinth seal Ans✓✓✓ d
A barring gear consists of an electric motor and several sets of reducing
gears to turn the turbine shaft at a low speed. It is used:
1) After stopping a hot turbine to prevent "hogging"
2) Only on small turbine
3) Continually when the turbine is not operating
4) Prior to start-up for approximately 3 hours
a. 1, 2, 4
b. 1, 2, 3
c. 1, 4
d. 2, 3
e. 2, 4 Ans✓✓✓ c
, A condensing-bleeder turbine can bleed up to ______ of the total steam
flow.
a. 0.1
b. 0.15
c. 0.2
d. 0.25
e. 0.3 Ans✓✓✓ c
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 Ans✓✓✓ d
A Hollow Drum Rotor, for good balance, is machined both outside and
inside thus the drum must be open at one end. How is the drum end
cover with shaft installed in the rotor?
a. Press fitted
b. Welded on
c. Bolted
d. Press fit and belted
e. Shrink fit and welded Ans✓✓✓ e
