ABSA 3B2 - Review |874 Questions with accurate
answers
_____ is well known for its contribution to the greenhouse effect.
Select one:
a.Ammonia
b.SOX
c.NOX
d.CO2 Ans✓✓✓ d.CO2
_____ turbines are large turbines that consist of two or more turbines in
series. The turbines are coupled together as one shaft and applied to one
generator.
Select one:
a.Topping
b.Tandem-compound
c.Condensing-bleeder
d.Cross-compound
e.Mixed pressure Ans✓✓✓ b.Tandem-compound
__________ on centrifugal air compressors are provided in order to
control the amount of air flowing to the impeller and thus control the
capacity of the unit.
Select one:
a.Adjustable inlet vanes
,b.Adjustable diffuser vanes
c.A variable frequency drive
d.Moving and fixed blades
e.A dummy piston Ans✓✓✓ a.Adjustable inlet vanes
199. 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. 1, 2, 3, 4
2. 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. velocity, pressure
,200. Turbine nozzles convert heat energy into:
a. Potential energy
b. Enthalpy
c. Eddy-currents
d. Kinetic energy
e. Pressure Ans✓✓✓ d. Kinetic energy
201. 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. kinetic, mechanical
203. 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 Ans✓✓✓ d. an impulse
, 204. 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. 1, 4
205. 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. Maintained constant
regardless of turbine load
206. 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
answers
_____ is well known for its contribution to the greenhouse effect.
Select one:
a.Ammonia
b.SOX
c.NOX
d.CO2 Ans✓✓✓ d.CO2
_____ turbines are large turbines that consist of two or more turbines in
series. The turbines are coupled together as one shaft and applied to one
generator.
Select one:
a.Topping
b.Tandem-compound
c.Condensing-bleeder
d.Cross-compound
e.Mixed pressure Ans✓✓✓ b.Tandem-compound
__________ on centrifugal air compressors are provided in order to
control the amount of air flowing to the impeller and thus control the
capacity of the unit.
Select one:
a.Adjustable inlet vanes
,b.Adjustable diffuser vanes
c.A variable frequency drive
d.Moving and fixed blades
e.A dummy piston Ans✓✓✓ a.Adjustable inlet vanes
199. 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. 1, 2, 3, 4
2. 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. velocity, pressure
,200. Turbine nozzles convert heat energy into:
a. Potential energy
b. Enthalpy
c. Eddy-currents
d. Kinetic energy
e. Pressure Ans✓✓✓ d. Kinetic energy
201. 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. kinetic, mechanical
203. 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 Ans✓✓✓ d. an impulse
, 204. 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. 1, 4
205. 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. Maintained constant
regardless of turbine load
206. 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
