ABSA 3B2 EXAM TESTBANK ALL WITH COMPLETE 500 QUESTIONS AND WELL ELABORATED ANSWERS JUST RELEASED THIS YEAR

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ABSA 3B2 EXAM TESTBANK ALL WITH
COMPLETE 500 QUESTIONS AND WELL
ELABORATED ANSWERS JUST RELEASED THIS
YEAR

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

e. Cross-compound

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

e. absolute

212. The distinguishing feature of a reaction turbine is the fact that the pressure drop across
the _________ blades:
a. cutting

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b. moving
c. sectional
d. stationary
e. moving and stationary

e. moving and stationary

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

a. axial

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

a. 1, 2, 3

215. A reaction turbine results in a long machine due to a large number of alternate rows of:
a. Nozzles and moving blades

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b. Nozzles and stationary blades
c. Fixed and moving blades
d. Stationary blades
e. Moving blades and nozzles

c. Fixed and moving blades

216. A turbine that expands the steam in two or more sets of nozzles in series, each set having
velocity-compounded blades to receive the steam issuing from the nozzles is called:
a. Extraction turbine
b. Velocity compounded turbine
c. Pressure compounded turbine
d. Pressure-velocity compounded turbine
e. Mixed-pressure turbine

d. Pressure-velocity compounded turbine

217. In pressure compound steam turbine:
1) The expansion of steam from boiler pressure to exhaust pressure is carried out in a number
of steps or stages
2) Each stage has a set of nozzles and a row of blades
3) All of the velocity available is developed in one set of nozzles
4) The rows of moving blades are separated from each other by partitions or diaphragms into
which the nozzles are set
a. 1, 2, 3
b. 2, 3, 4
c. 1, 3, 4
d. 1, 2, 4
e. 1, 2, 3, 4

d. 1, 2, 4

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218. In a steam turbine using velocity compounding _____________ expands the steam from
initial to exhaust pressure:
a. two sets of nozzles and moving blades
b. stationary blades
c. stationary and moving blades
d. moving blades
e. one of the nozzles

e. one of the nozzles

219. In a condensing-bleeder turbine up to 20% of the total steam flow may be bled off. What
is the bleed-steam used for:
a. Building heating
b. Relieving pressure
c. Atomization of the fuel
d. To be reheated in boiler
e. Feed-water heating

e. Feed-water heating

220. 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

c. 0.2

221. The primary purpose of a back-pressure turbine is electrical generation:
a. True
b. False