3B2 chap 1-7 (2nd set) Questions With Complete Solutions
_____ and ______ can be used in an HRSG to reduce NOx.
a. steam and NH3
b. CO2 and NH3
c. SO2 and NH3
d. H2O and NH3
e. CO2 and SO2 Correct Answers a. steam and NH3
_____ is well known for its contribution to the greenhouse
effect.
a. C4H82
b. CO
c. CO3
d. CO2
e. CH3 Correct Answers d. CO2
_______ is the percent change in speed required for load change
to equal the rated.
a. speed governor
b. governor speed drop
c. governor speed increase
d. throttle governing
e. integral band Correct Answers b. governor speed drop
________ 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 Answers b. tandem compound
_________ 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 Answers e. cross compound
A _____ also acts as a deaerator even with the turbine at full
load and the condenser operatingh at a reduced vacuum.
a. feed pump
b. cooling tower
c. air cooled condenser
d. surface condenser
e. jet condenser Correct Answers d. surface condenser
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 Correct Answers d. Topping turbine
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 Correct Answers d.
counteract end thrust
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
2) Only on a 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 Correct Answers c. 1, 4
A carbo blast cleaning consists of ______.
a. using carbon black to clean the unit
, b. removing all the carbon by blasting it off with solvents
c. removing all the dirt by scrubbing the blades with rice
d. removing dirt and carbon with high pressure water
e. removing carbon from the gas passages, blades, and nozzles
Correct Answers c. removing all the dirt by scrubbing the
blades with rice
A closed cycle gas turbine system
a. does not use a starting motor
b. has lower pressure used in system
c. will use the same working fluid over again
d. must use a cooler before regeneration
e. has a lower initial cost than that of the open cycle gas turbine
Correct Answers c. will use the same working fluid over again.
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 Correct Answers c. 0.2
A fuel gas compressor must be used on gas turbines if:
a. the complexity of the gas system reduces the gas pressure too
low
b. The gas supply pressure is less than the compressor last stage
pressure
_____ and ______ can be used in an HRSG to reduce NOx.
a. steam and NH3
b. CO2 and NH3
c. SO2 and NH3
d. H2O and NH3
e. CO2 and SO2 Correct Answers a. steam and NH3
_____ is well known for its contribution to the greenhouse
effect.
a. C4H82
b. CO
c. CO3
d. CO2
e. CH3 Correct Answers d. CO2
_______ is the percent change in speed required for load change
to equal the rated.
a. speed governor
b. governor speed drop
c. governor speed increase
d. throttle governing
e. integral band Correct Answers b. governor speed drop
________ 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 Answers b. tandem compound
_________ 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 Answers e. cross compound
A _____ also acts as a deaerator even with the turbine at full
load and the condenser operatingh at a reduced vacuum.
a. feed pump
b. cooling tower
c. air cooled condenser
d. surface condenser
e. jet condenser Correct Answers d. surface condenser
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 Correct Answers d. Topping turbine
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 Correct Answers d.
counteract end thrust
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
2) Only on a 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 Correct Answers c. 1, 4
A carbo blast cleaning consists of ______.
a. using carbon black to clean the unit
, b. removing all the carbon by blasting it off with solvents
c. removing all the dirt by scrubbing the blades with rice
d. removing dirt and carbon with high pressure water
e. removing carbon from the gas passages, blades, and nozzles
Correct Answers c. removing all the dirt by scrubbing the
blades with rice
A closed cycle gas turbine system
a. does not use a starting motor
b. has lower pressure used in system
c. will use the same working fluid over again
d. must use a cooler before regeneration
e. has a lower initial cost than that of the open cycle gas turbine
Correct Answers c. will use the same working fluid over again.
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 Correct Answers c. 0.2
A fuel gas compressor must be used on gas turbines if:
a. the complexity of the gas system reduces the gas pressure too
low
b. The gas supply pressure is less than the compressor last stage
pressure
