4Th Class Power Engineering Chapter 60

Front 1

The use of tubular gauge glasses is limited to lower __________ and __________. Also they are restricted to __________ and __________ material.

Back 1

Pressures and temperatures

Nontoxic and non hazardous

Front 2

Tubular gauge glasses should not exceed _______mm in length.

Back 2

750 mm

Front 3

The lowest visible water level in a Guage glass shall be at least _____ mm above the lowest permissible water level as determined by the manufacturer.

Back 3

50 mm

Front 4

For a horizontal fire tube boiler with a diameter greater than _____ mm, the lowest visible water level in the gauge glass must be at least _____ mm above the lowest permissible water level

Back 4

400 mm

75 mm

Front 5

If the Guage glass leaks when put into service, _____________________ while the glass is under pressure.

Back 5

Do not tighten the nuts

Front 6

Round tubular Guage glasses are not recommended for pressures above _______ kPa

Back 6

2800 kPa

Front 7

When using try cocks to maintain fluid levels try to keep the water between the __________ and ___________ try cocks.

Back 7

Middle and upper

Front 8

Water column material:

Cast iron 0 to _______kPa

Malleable iron 0 to ________kPa

Steel ________kPa and above

Back 8

1720 kPa

2410 kPa

2410 kPa

Front 9

A great advantage of an Igema level indicator over a Hopkinson unit is:

1) There are no moving parts

2) It is the least costly to purchase

3) It has the highest degree of accuracy

4) Its ability to show steam and water as different colors

5) It requires no electricity

Back 9

1) There are no moving parts

Front 10

Connections for gauge glasses connected directly to the power boiler or to an intervening water column shall be at least:

1) 20 mm

2) 76 mm

3) 25 mm

4) 50 mm

5) 15 mm

Back 10

5) 15 mm

Front 11

Dirt traps are installed on an "Igema" remote water level indicator:

1) To prevent osmosis from occurring

2) So that overfilling of the indicating section is prevented

3) To prevent indicating liquid contamination

4) To prevent mixing of the indicating liquid with boiler water

5) Because of the high amount of suspended solids collecting in the constant head

Back 11

3) To prevent indicating liquid contamination

Front 12

Each gauge glass shall be fitted with a drain cock or valve having an unrestricted drain opening of not less than _____ diameter to facilitate cleaning.

1) 2 mm

2) 10 mm

3) 6 mm

4) 25 mm

5) 15 mm

Back 12

3) 6 mm

Front 13

Gauge glasses show a water level that is:

1) Slightly less than the level if the vessel is at a lower temperature

2) The actual vessel level regardless of pressure, temperature, or density differences

3) Slightly higher than boiler level when the pressure is high

4) Slightly lower when the glass water density is higher

5) The same if all liquids have the same temperature

Back 13

4) Slightly lower when the glass water density is higher

Front 14

Transparent gauge glasses are lined with mica to:

1) Prevent erosion of glass

2) Increase strength of the glass

3) Provide a high temperature seal

4) Cool the glass

5) Make level easier to see

Back 14

1) Prevent erosion of glass

Front 15

A gauge glass which shows a clear liquid as being very dark is the:

1) Flat gauge glass

2) Tubular gauge glass

3) Igema indicator

4) Hopkinson indicator

5) Reflex gauge glass

Back 15

5) Reflex gauge glass

Front 16

The quick closing valves on the water gauge requires only a/an _____ of a turn of the valve spindle to change the valve from the full open to the full closed position and vice versa.

1) One-third

2) Fifth

3) Eighth

4) Half

5) Quarter

Back 16

5) Quarter

Front 17

A disadvantage of a gauge glass safety shutoff valve is:

1) It makes gauge glass replacement more difficult

2) The glass cannot be blowndown

3) It cannot withstand high pressure

4) Loss of water is not prevented

5) It requires more maintenance

Back 17

5) It requires more maintenance

Front 18

The following conditions may be encountered in level measurement and indication:

1) Extremes of heat and cold

2) Pressure variations

3) All of the above

4) Corrosive and explosive conditions

5) Solids or liquids

Back 18

3) All of the above

Front 19

The main operating element of a Hopkinson remote water level indicator is a:

1) Float

2) Ledoux bell

3) Capsule

4) Large diaphragm

5) Bourdon tube

Back 19

4) Large diaphragm

Front 20

For pressure above 2 800 kPa, a gauge glass housing is constructed of:

1) Cast iron

2) Aluminum

3) Stainless steel

4) Steel

5) Brass

Back 20

4) Steel

Front 21

For pressure above 2 410 kPa, a water column is constructed of:

1) Stainless steel

2) Steel

3) Brass

4) Cast iron

5) Aluminum

Back 21

2) Steel