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Book 1 - 5th Power Engineering > chapter 5 > Flashcards

chapter 5 Flashcards

1
Q

The type of gauge that is commonly used to indicate steam pressure inside a boiler is the ______gauge

a. Safety
b. Gauge glass
c. Bourdon tube
d. Directly attached

A

c

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2
Q

The lowest visible part of the water gauge glass will be above the ________recommended by the manufacturer.

a. Middle try cock
b. Fire line
c. Top of the firetubes
d. Lowest permissible water level

A

d

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3
Q

The blowoff connection on a boiler is made:

a. just below the feedwater inlet
b. At the lowest permissible water level
c. At the lowest point of the boiler
d. Just below the safety valve connection

A

c

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4
Q

During a safety valve pop test on a steam boiler

a. A 5th Class Power Engineer is authorized to put jumper wires on the electrical terminals of the pressure controllers
b. There should not be more than 75% of the safety valve set point on the boiler
c. The safety valve is acceptable providing it opens within plus-or-minus 20% of its setpoint
d. The steam discharge and feedwater supply valves should be closed

A

d

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5
Q

The type of gauge that is commonly used to indicate steam pressure inside a boiler is the ______gauge

a. Directly attached
b. Bourdon tube
c. Safety
d. Gauge glass

A

b

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6
Q

One purpose of a vent valve on a steam boiler:

a. Verify the boiler water level
b. Allow flue gases to pass up the chimney
c. Relieve pressure in case of over-firing
d. Allow air to escape when the boiler is being filled

A

d

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7
Q

One main purpose of a water column is to:

a. Provide more water volume in the boiler
b. Bring the gauge glass closer to the operator
c. Ensure that the water level is above the Lowest Permissible Water Level
d. Reduce turbulence in the gauge glass

A

d

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8
Q

To protect against an over-pressure failure, all steam boilers must be equipped with one or more:

a. Safety valves
b. Combustion controllers
c. Pressure controllers
d. Vent valves

A

a

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9
Q

On a steam boiler, the feedwater connection must be made:

a. With a stop valve close to the boiler and a check valve between the stop valve and the boiler
b. At the lowest point of the boiler
c. With a check valve close to the boiler and a stop valve between the check valve and the boiler
d. Above the lowest permissible water level

A

c

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10
Q

Main boiler stop valves should be:

a. Outside stem & yoke globe valves
b. Plug valves
c. Outside stem & yoke gate valves
d. Slow opening valves

A

c

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11
Q

On a high pressure steam boiler fitted with a quick opening and a slow opening blowdown valve set, the proper blowdown operation sequence is:

a. Operate with the quick opening valve open at all times so that you can blowdown with the slow opening valve
b. Open the slow opening valve, then open the quick opening valve
c. Crack open each valve starting with the quick, then fully open both valves starting with the quick
d. Open the quick opening valve, then open the slow opening valve

A

d

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12
Q

Try cocks are:

a. A secondary means of determining the boiler water level
b. Not allowed on water tube boilers
c. A secondary means of blowing down the boiler
d. A primary means of determining the boiler water level

A

a

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13
Q

A siphon protects the steam pressure gauge from:

a. Corrosion
b. High temperature of steam
c. Over-pressure
d. Vacuum

A

b

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14
Q

A pressure gauge can most accurately be calibrated by using:

A. A test gauge comparator
B. A dead weight tester
C. Another pressure gauge
D. The Inspector’s test gauge
E. Hydraulic comparator

A

b

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15
Q

A valve commonly used as a boiler stop valve is the _____ valve.
A. Needle
B. Gate
C. Butterfly
D. Plug
E. Ball

A

b

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16
Q

When the pressure inside the Bourdon tube increases the tube will tend to:

A.Curve more showing lower pressure
B.Straighten showing higher pressure
C.Curve more showing higher pressure
D.Become more oval showing higher pressure
E.Straighten showing lower pressure

A

b

17
Q

When the pressure in the boiler approaches its _____, the safety valve will pop open and release the steam to atmosphere.
A.Maximum allowable working pressure
B.Normal process header steam pressure
C.Turbine inlet operating pressure
D.Normal steam drum operating pressure
E.Ultimate tensile strength

A

a

18
Q

The blowdown tank is/does

a.Not cool the water
b.Does not allow the pressure to be reduced
c.Is not required on a low pressure boiler
d.Does not empty into the sewer

A

c

19
Q

Boiler fittings are:

A.Valves and instruments in the boiler plant
B.Devices used for the safe operation of boiler plants
C.Devices directly attached to any part of a boiler
D.All pipe fittings used with boiler operation
E.Devices directly attached to the pressure part of a boiler

A

e

20
Q

Pressure gauges may loose their accuracy due to:

A.Excessive vibration
B.Wear and tear
C.All of the above
D.Metal fatigue
E.Steam entering the Bourdon tube

A

c

21
Q

Before feedwater enters a boiler the feedwater pipe must be fitted with a:

A.Ball valve between the check valve and the boiler
B.Check valve between the stop valve and the boiler
C.Gate valve between the check valve and the boiler
D.Globe valve between the check valve and the boiler
E.Stop valve between the check valve and the boiler

A

e

22
Q

A hydrostatic test is at a pressure of

a.1.5 times the bursting pressure
b.1.5 times the operating pressure
c.1.5 times atmospheric
d.1.5 times the maximum allowable working pressure

A

d

23
Q

All fitting markings shall be legible and must indicate the following minimum requirements.

  1. National Pipe Size
  2. Manufacturer’s name or trade mark
  3. Vendors Identification
  4. Service designation
  5. Material designation

A.2, 3, 4
B.3, 4, 5
C.1, 2, 3
D.1, 3, 5
E.2, 4, 5

A

e

24
Q

the type of gauge that is comomnly used to indicate steam pressure inside a boiler is the _______ gauge:

a. gauge glass
b. bourbon tube
c. safety
d. directly attached

A

b

25
Q

to protect the pressure gauge from the high tenperature of the steam a ______ installed between the steam and the gauge

a. check valve
b. stop valve
c, vacuum tube
d. pipe syphon

A

d

26
Q

you would test a boiler pressure gauge wihle in service by using a _______

a. dead weight tester
b. hydraulic tester
c. mastertest gauge
d. pop test

A

c

27
Q

the _______ valve protects the boiler when the pressure approaches its maximum allowable working pressure

a. vent
b. safety
c. check
d. blowoff

A

b

28
Q

the lowest visible part of the water gauge glass will be above the __________ recomended by the manufacturer
a. lowest permissable water level
b. fire line
c. top of the firetubes
d. middle try cock

A

a

29
Q

an advantage of useing a water column in that it

a. allows air to escape when filling the boiler
b. will indicate the boiler pressure
c. makes the water level easier to read
d. prevents water and steam from escaping if the gauge glass breaks

A

c

30
Q

the blowoff connection on a boiler is made

a. at the lowest permissible water level
b. just below the safety valve connection
c. at the lowest point of the boiler
d. just below the feedwater inlet

A

c

Book 1 - 5th Power Engineering (20 decks)

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