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3B2 > Ch.1 > Flashcards

Ch.1 Flashcards

1
Q
  1. 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

A

D. 1, 2, 3, 4
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

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2
Q
  1. Turbine nozzles convert heat energy into:

a. Potential energy
b. Enthalpy
c. Eddy-currents
d. Kinetic energy
e. Pressure

A

D. Kinetic energy

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3
Q
  1. 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

A

C. kinetic, mechanical

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4
Q
  1. 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

A

A. velocity, pressure

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5
Q
  1. 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

A

D. an impulse

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6
Q
  1. 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

A

C. 1, 4
1) Decrease steam pressure.
4) Increase steam velocity

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7
Q
  1. 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

A

C. Maintained constant regardless of turbine load

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8
Q
  1. 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

A

D. Topping turbine

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9
Q
  1. A topping turbine is a special application of a ________ turbine.

a. condensing
b. extraction
c. condensing-bleeder
d. tandem compound
e. back-pressure

A

E. back-pressure

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10
Q
  1. _____________ 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

A

B. Tandem-compound

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11
Q
  1. 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

A

D. Tandem-compound turbine

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12
Q
  1. __________________ 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

A

E. Cross-compound

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13
Q
  1. 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

A

E. absolute

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14
Q
  1. 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. angular

A

B. moving

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15
Q
  1. 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

A. axial

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16
Q
  1. 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

A. 1, 2, 3

1) Convert the kinetic energy of the steam into mechanical energy
2) Convert heat energy into kinetic energy
3) Are nozzle shaped

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17
Q
  1. 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

A

C. Fixed and moving blades

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18
Q
  1. 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

A

D. Pressure-velocity compounded

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19
Q
  1. 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

A

D. 1, 2, 4

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

4) The rows of moving blades are separated from each other by partitions or diaphragms into which the nozzles are set

20
Q
  1. 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

A

E. one of the nozzles

21
Q
  1. 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

A

E. Feed-water heating

22
Q
  1. 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

A

C. 0.2

23
Q
  1. The primary purpose of a back-pressure turbine is electrical generation.

a. True
b. False

A

B. False

24
Q
  1. Extraction turbines are turbines where steam is extracted at one or more points at constant _________.

a. flow
b. pressure
c. load
d. temperature
e. efficiency

A

B. pressure

24
Q
  1. In a back-pressure turbine the process steam pressure is:

a. Kept constant and the generator output depends on the demand for process steam
b. Varied and the generator output remains constant
c. Kept constant and the generator output remains constant
d. Not important
e. Dependant on the generator output

A

A. Kept constant and the generator output depends on the demand for process steam

25
Q
  1. Extraction turbines are turbines where steam is extracted at one or more points at constant _________.

a. flow
b. pressure
c. load
d. temperature
e. efficiency

A

B. pressure

26
Q
  1. Labyrinth seals are:
1)     Made of cast iron
2)     A positive leak-proof seal arrangement
3)     Design to have large clearances between the shaft and casing
4)     Made of brass or stainless steel
5)     Use on larger diameter turbine shaft

a. 1, 2, 5
b. 2, 4, 5
c. 3, 4, 5
d. 4, 5
e. 1, 2, 3

A

D. 4, 5

27
Q
  1. A steam turbine water seal is used ________ to insure that no air leaks in along the shaft.

a. on start-up
b. at speed below 2000 rev/min
c. on shut-down
d. only on condensing turbine
e. at speed above 2000 rev/min

A

E. at speed above 2000 rev/min

28
Q
  1. On larger turbines, the _________ is split in a horizontal direction.

a. shaft
b. governor
c. cylinder
d. rotor
e. drum

A

C. cylinder

29
Q
  1. It is general practice to let the thickness of the walls and flanges ___________ from inlet to exhaust end of a steam turbine casing.

a. decrease
b. fluctuate
c. be the same
d. vary
e. increase

A

A. decrease

30
Q
  1. Materials at the given maximum temperature and under constant pressure continue to deform with very slowly increasing strain of the material; this phenomenon is called _________________.

a. creep
b. elongation
c. deformation
d. jerking
e. movement

A

A. creep

31
Q
  1. Steam turbine casing joints are made steam tight by matching _______ exactly.

a. thin high temperature gasket
b. bowel pins
c. alignment notches
d. flange faces
e. rubber gasket

A

D. flange faces

32
Q
  1. A steam turbine assembled casing is machined off inside in a boring mill to:
1)     Make grooves for shaft seals
2)     Make grooves for diaphragms
3)     Machine surfaces for bearings
4)     Machine flange surfaces flat

a. 1, 2, 3
b. 2, 3, 4
c. 1, 3
d. 1, 2, 4
e. 1, 4

A

a. 1, 2, 3

1) Make grooves for shaft seals
2) Make grooves for diaphragms
3) Machine surfaces for bearings

33
Q
  1. 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

A

E. Shrink fit and welded

34
Q
  1. When disc rotors are assembled, the discs are heated until they are easily slid along the shaft and then located in the correct position on the shaft and shaft key. A small clearance between the discs prevents ________ .

a. noises
b. slippage
c. thermal stress in the shaft
d. acceleration
e. vibrations

A

C. thermal stress in the shaft

35
Q
  1. Rotors for high outputs and high temperatures are generally made of________ steels.

a. chromium
b. chromium-nickel
c. nickel-molybdenum
d. chromium-nickel-molybdenum
e. copper-nickel-bronze

A

D. chromium-nickel-molybdenum

36
Q
  1. The axial thrust in impulse turbines is nearly eliminated by use of a balance or dummy piston.

a. True
b. False

A

B. False

37
Q
  1. 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

A

D. Counteract end thrust

38
Q
  1. A steam turbine balance piston is fitted with rings to ensure a tight seal.

a. True
b. False

A

B. False

39
Q
  1. A steam turbine balance piston is fitted with ______ to ensure a tight seal.

a. carbon rings seal
b. blades seal
c. water seal
d. diaphragm
e. labyrinth seal

A

E. labyrinth seal

40
Q
  1. Reaction steam turbines often use __________________ seals as part of the shroud with the seal clearances kept as small as possible.

a. radial
b. Water
c. radial and axial
d. Carbon
e. Axial

A

C. radial and axial

41
Q
  1. The purpose of a thrust bearing on large reaction steam turbine is to:
1)     Give confidence to the operator
2)     To keep the rotor in an exact position in the casing
3)     Prevent any steam from escaping
4)     To absorb any axial thrust on the rotor
5)     Support the dummy piston

a. 1, 2, 3
b. 2, 4, 5
c. 2, 4
d. 3, 5
e. 1, 4

A

C. 2, 4

2) To keep the rotor in an exact position in the casing
4) To absorb any axial thrust on the rotor

42
Q
  1. If left at a standstill, while the turbine is still hot, the lower half of the rotor will cool off faster than the upper half and the rotor will ______________________ or “hog”.

a. turn on it’s own
b. bend upwards
c. twist
d. bend downwards
e. stall

A

B. bend upwards

43
Q
  1. 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

A

C. 1, 4

1) After stopping a hot turbine to prevent “hogging”
4) Prior to start-up for approximately 3 hours

44
Q
  1. A jacking oil pump is used to:
1)     Make slight adjustments to the turbine bearing housings during overhaul to maintain alignment
2)     Supply oil to a hydraulic motor for the turning gear
3)     Supply oil to the bearings under the shaft at all times so lubrication is assured
4)     Supply a high volume of oil at high pressure

a. 1, 2, 3
b. 2, 3, 4
c. 1, 3, 4
d. 1, 2, 3, 4
e. None of the above

A

E. None of the above

45
Q
  1. In a nuclear power station a _____________ supplies heat through a _________ to the working fluid in place of a steam plant boiler.
1)     reactor
2)     heat exchanger
3)     burner
4)     pump

a. 1, 2
b. 1, 3
c. 3, 2
d. 1, 4
e. 2, 4

A

A. 1, 2

1) reactor
2) heat exchanger

46
Q
  1. In a nuclear power plant circulating coolant picks up heat in the reactor and rejects it to the _______________ in the steam cycle by means of a heat exchanger.

a. hotwell
b. condenser
c. working fluid
d. turbine
e. feed pump

A

C. working fluid

3B2 (15 decks)

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