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3B2 > Ch. 3 > Flashcards

Ch. 3 Flashcards

1
Q
  1. When starting up a turbine it is not necessary to open trap bypasses as the traps will remove condensate as it is produced.

a. True
b. False

A

B. False

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2
Q
  1. Sealing steam to the turbine glands is admitted ___________ is put in operation.

a. before the extraction pump
b. before the condenser circulating water pump
c. after the air ejector
d. after the extraction pump
e. after the throttle valve is open

A

D. after the extraction pump

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3
Q
  1. The extraction (condensate) pump is put into operation ______ the ______.
1)     before
2)     after
3)     air ejector
4)     jack oil pump
5)     condenser circulating water pump

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

A

A. 1, 3

1) before
3) air ejector

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4
Q
  1. The jacking oil pump supplies oil at pressures of _______to________ kPa.

a. 6000 - 8000
b. 7000 - 9000
c. 8000 - 10000
d. 9000 - 11000
e. 10000 - 12000

A

C. 8000 - 10000

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5
Q
  1. The jacking oil pump supplies lubricating oil to the:

a. Side of the bearing
b. Top of the bearing
c. Center of the shaft
d. Bottom of the bearings
e. Thrust bearing

A

D. Bottom of the bearings

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6
Q
  1. Heat transfer takes place from a ________.

a. hotter to a cooler body except in refrigeration
b. hotter to cooler if the pressure on hot body is higher
c. cooler to a hotter body
d. cooler to a hotter body
e. hotter to a cooler body

A

E. hotter to a cooler body

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7
Q
  1. The rate of heat transfer will depend on:
1)     Temperature difference
2)     Thermal resistance to heat flow at the material separating the two fluids
3)     Area of transmitting surface

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

A

C. 1, 2, 3

1) Temperature difference
2) Thermal resistance to heat flow at the material separating
the two fluids
3) Area of transmitting surface

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8
Q
  1. In a steam turbine condenser the temperature difference from exhaust steam to cooling water will:

a. Remain the same under all loads
b. Increase with a load decrease
c. Increase with a load increase for most loads
d. Remain the same under most loads
e. Decrease with a load increase

A

C. Increase with a load increase for most loads

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9
Q
  1. Power plant thermal efficiencies could be easily doubled by removing the _________ and using the exhaust steam for heating.

a. hot well
b. condenser
c. feed pump
d. circulating pump
e. deaerator

A

B. condenser

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10
Q
  1. If the cooling water for a condenser, taken from a cooling tower is high in dissolved oxygen, the ability of the condenser to act as a deaerator is ____________ .

a. directly proportional to the level of dissolved oxygen
b. not impeded
c. inversely proportional to the level of dissolved oxygen
d. impeded
e. reduced

A

B. not impeded

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11
Q
  1. The _______________ cooling water is in direct contact with the turbine exhaust steam.

a. down flow condenser
b. central flow condenser
c. radial flow condenser
d. jet condenser
e. air ejector

A

D. jet condenser

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12
Q
  1. A _______________ also acts as a deaerator even with the turbine at full load and the condenser operating at a reduced vacuum.

a. feed pump
b. cooling tower
c. air cooled condenser
d. surface condenser
e. jet condenser

A

D. surface condenser

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13
Q
  1. In a ______________ the feed pump draws from the hot well only the quantity of feed water required by the boiler, the remainder overflows into the cooling pond where it is cooled and reused as cooling water.

a. surface condenser
b. counterflow condenser
c. down flow condenser
d. radial flow condenser
e. jet condenser

A

D. radial flow condenser

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14
Q
  1. The purposes of a surface condenser is to:
1)     Maintain a vacuum at the turbine exhaust
2)     Conserve pure boiler feedwater
3)     Act as a deaerator
4)     Cool the condensate below saturation temperature

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

A

A. 1, 2, 3

1) Maintain a vacuum at the turbine exhaust
2) Conserve pure boiler feedwater
3) Act as a deaerator

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15
Q
  1. A surface condenser may be ________________ .
1)     oval
2)     triangular
3)     cylindrical
4)     rectangular
5)     hexagon

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

A

E. 1, 3, 4

1) oval
3) cylindrical
4) rectangular

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16
Q
  1. Condenser tube plates can be installed with __________.
1)     ferrules
2)     metallic or fiber packings
3)     roll expanding
4)     combination of roll expanding and ferrule
5)     all of the above

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

A

E. 1, 3, 4

1) ferrules
3) roll expanding
4) combination of roll expanding and ferrule

17
Q
  1. In a surface condenser, when the tubes and the tube plates are practically the same material such as admiralty brass tubes in admiralty brass plates, the tubes can be ________ into the tube plates.

a. ferruled
b. welded
c. roll-expanded
d. packed with metallic or fiber packing
e. roll-expanded at inlet and ferruled at outlet

A

B. welded

18
Q
  1. Allowances must be made for differential expansion of the tubes and shell. Packed tube-ends may allow the tube to move ____________ .

a. through an expansion joint
b. through an expansion loop
c. very little
d. axially in the packing
e. radially in the packing

A

D. axially in the packing

19
Q
  1. The classic material for water boxes has always been:

a. Admiralty brass
b. Cast iron
c. Muntz metal
d. Low carbon steel
e. Steel alloy

A

B. Cast iron

20
Q
  1. Air in a surface condenser:
1)     Increases the pressure
2)     Retards heat transfer
3)     Enters with the high pressure ejector steam
4)     Is cooled before being removed

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

A

D. 1, 2, 4

21
Q
  1. In a two stage air ejector for a surface condenser the pressure of the first stage ejector cooler is _________ atmospheric but above ____________ pressure.
1)     above
2)     ejector
3)     condenser
4)     below
5)     steam

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

A

d. 4, 3

22
Q
  1. The cooling water for the air ejectors on a surface condenser is _____________ .

a. row water
b. treated water
c. condensate
d. river water
e. distilled water

A

C. condensate

23
Q
  1. The methods to detect cooling water leaks in a surface condenser while it is in operation are:
1)     pH test
2)     electrical conductivity test
3)     plastic wrapping test
4)     silver nitrate test
5)     fluorescing dye test

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

A

a. 2, 4

2) electrical conductivity test
4) silver nitrate test

24
Q
  1. Under normal operating conditions a surface condenser, the atmospheric relief valve is held closed by ___________.

a. a spring
b. vacuum
c. atmospheric pressure
d. water pressure
e. pressure difference between the atmosphere outside the vacuum in the shell

A

D. water pressure

25
Q
  1. The _____________ function is to continually extract the condensate from the condenser hotwell and pump it through the air ejector coolers.

a. extraction pump
b. circulating pump
c. vacuum pump
d. feed water pump
e. cooling water pump

A

A. extraction pump

26
Q
  1. The condenser extraction pump suction operates at pressures ______________.

a. slightly above atmospheric
b. just below atmospheric
c. near absolute zero
d. equal to 2 atmosphere
e. determined by the level of condensate in the condenser

A

C. near absolute zero

27
Q
  1. In order to prevent air from entering the condenser when the condenser condensate extraction pump is in stand-by position, the pump is equipped with:

a. Shaft sleeves
b. Labyrinth seals
c. Mechanical seals
d. Carbon rings
e. Water sealed glands

A

E. Water sealed glands

28
Q
  1. Feedwater heaters use _____________ of bleed steam to heat feedwater.

a. sensible heat
b. latent heat
c. super heat
d. sensible and latent heat
e. sensible and super heat

A

B. latent heat

29
Q
  1. Low-pressure feedwater heaters are exposed on the waterside to the discharge pressure of the _______________ pump.

a. circulating
b. extraction
c. cooling water
d. boiler feedwater
e. air ejector

A

B. extraction

30
Q
  1. High-pressure feedwater heaters are exposed on the waterside to the discharge pressure of the ______________ pump.

a. extraction
b. cooling water
c. boiler feedwater
d. circulating
e. air ejector

A

C. boiler feedwater

31
Q
  1. Low-pressure feedwater heaters commonly use a __________ design.

a. straight-tube
b. “U” tube
c. “c” tube
d. bent tube
e. low tube

A

A. straight-tube

32
Q
  1. High-pressure feedwater heaters commonly use a _______ design for thermal expansion and contraction.

a. “c” tube
b. straight tube
c. low tube
d. “U” tube
e. bent tube

A

D. “U” tube

3B2 (15 decks)

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