ABSA 3B1 Practice Exam Questions and Answers Verified Solutions Latest Update

ABSA 3B2 - Review Exam Questions and Answers Verified Solutions
Latest Update

Question: On exam
Answer:


Question: 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
Answer:
D. 1, 2, 3, 4

Question: 200. Turbine nozzles convert heat energy into: a. Potential energy b. Enthalpy c.
Eddy-currents d. Kinetic energy e. Pressure
Answer:
D. Kinetic energy
Chapter 1

Question: 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
Answer:
C. kinetic, mechanical

Question: 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
Answer:
A. velocity, pressure

Question: 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
Answer:
D. an impulse

,Question: 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
Answer:
C. 1, 4

Question: 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
Answer:
C. Maintained constant regardless of turbine load

Question: 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 c. Condensing turbine d. Topping turbine e.
Mixed pressure turbine
Answer:
D. Topping turbine

Question: 207. A topping turbine is a special application of a ________ turbine: a. condensing b.
extraction c. condensing-bleeder d. tandem compound e. back-pressure?
Answer:
E. back-pressure

Question: 208 _________ 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
Answer:
B. Tandem-compound

Question: 209. 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
Answer:
D. Tandem-compound turbine

, Question: 210 ____________ 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
Answer:
E. Cross-compound

Question: 211. 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
Answer:
E. absolute

Question: 212. 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. moving and stationary
Answer:
E. moving and stationary

Question: 213. 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
Answer:
A. axial

Question: 214. Reaction turbine blades (moving): 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
Answer:
A. 1, 2, 3

Question: 215. A reaction turbine results in a long machine due to a large number of alternate rows of:
a. Nozzles and moving blades b. Nozzles and stationary blades c. Fixed and moving blades d.
Stationary blades e. Moving blades and nozzles
Answer:
C. Fixed and moving blades