First Quarter Exam Flashcards
The maximum size bottom blowdown valves on boiler is ______”
1
1 1/2
2
2 1/2
2 1/2”
Boilers in battery equipped with_____must have two main steam stop valve and a free-blowing drain between them
Common blowdown lines
Manhole openings
Handhole opening
Continúes blowdown
Manhole openings
Continues blowdown line is located ______
At the NOWL
in the mud drum
In the flash tank
In the steam and water well below the NOWL
In the steam and water well below the NOWL
A manometer is read in________
Inches of water
Psig
Psia
None of the above
Inches of water
The boiling point of water will_____with an increase in pressure
Not change
Be raised
Be lowered
Raised until 212
Be raised
The range of a pressure gauge should be twice the safety valve setting, but not less than______times the safety valve setting
1
1 1/4
1 1/2
1 3/4
1 1/2
The superheater drain is used to______
Remove gases from the superheater
Remove condensate
Relieve pressure
Establish steam flow
Establish steam flow
Waterwalls tubes protect the refractory and_____
Increase boiler heating surface
Act as stays for tubes sheets
Allow the operator to blowdown while steaming
Help control water circulation
Increase boiler heating surface
Steam at 250 psia and 400f i considered
Supersaturaed
Saturated
Superheated
Saturated
The safety valve setting on the steam and water drum is _______the superheated safety valve
Lower than
Higher than
The same as
None of the above
Higher than
Sensible heat is heat_____
Changes a substance state but not its temperature
Changes a substance temperature and its state
Changes a substance temperature but not its state
Changes a substance temperature but not its state
Extra heave pipe must be used on blowdown line when the steam pressure exceeds______ psi
15
100
125
200
125 psi
A safety valve on a boiler pops___
When the boiler reaches its working pressure
Between the working pressure and the MAWP
At 15 psi
At 150 psi
Between the working pressure and the MAWP
As the steam pressure in the boiler increases there is a corresponding increase in the
BHP
water level
Volume of steam
Temperature of steam and water
Temperature of steam and water
Normally a water column and gauge glass should be blowdown
At the start of a shift and when ever in doubt of the water level
At least once at day
When ever the water level is high
At the start of a shift and when ever in doubt of the water level
Baffles are used in the steam and water drum of watertube boilers to ______
Provide better circulation
Prevent water carryover with the steam
Clean the steam
Prevent water carryover with the steam
The tubes in a watertube boiler are fastened by
Expending and welding
Rolling and expanding in drums and headers
Rolling and beading in drums and headers
Ring welding
Rolling and expanding in drums and headers
Heat that changes the temperature of a substance but not its state is_____
Latent heat
Heat of evaporation
Sensible heat
Heat of fusion
Sensible heat
If a boiler is equipped with an automatic return valve. It must be
On the bLowdown line
On the feedwater line next to the boiler
The valve closest to the boiler shell
Between the main steam stop valve and header
The valve closest to the boiler shell
A broken baffle on a watertube boiler would cause
Tubes to leak
Increase in steam pressure
Increase in chimney temperature
Carryover
Increase in chimney temperature
The minimum size manhole is_____
11” x 11”
12” x 12”
11” x 13”
11” x 15”
11” x 15”
Cast iron water columns may be used for pressures up to______psi
100
250
300
500
250 psi
All high pressure boilers must have more than one method to determine water level. A gauge glass and_____
Low water fuel cutoff
Whistle valve
Water columns
Try cocks
Try cocks
Water walls should be blowdown
Daily
Weekly
When the furnace is cool
Once every six month
When the furnace is cool
An automatic non return valve is used with
Engine
Pump
Boiler
Condenser
Boiler
______gauge glasses are used on boilers with pressure exceeding 250 psi
Tubular
Flat
Cast iron
None of the above
Flat
The dry pipe is located in the_____
Upper part of the steam and water drum
Superheater outlet header
Main steam line
Line before the turbine throttle
Upper part of the steam and water drum
Boiler in battery equipped with manhole openings must have_____according to the ASME code
Two main steam stop valves
One main steam stop valve
No valves between boilers and headers
Boilers in battery have no manhole openings
Two main steam stop valves
The boiler superheater raises the temperature of the ______
Feedwater
Gases of combustion
Air for combustion
Steam leaving the boiler
Steam leaving the boiler
The range of a boiler pressure gauge must not be less than______times the safety valve setting
1 1/2”
2”
2 1/2”
3”
1 1/2”
Boiler safety valves capacity must be such that the steam pressure can never go higher than______%
4%
5%
6%
10%
6%
The best time to blown down a boiler is when it is
At its peak load
At 75% of its peak load
At its lowest load
Bein taken out of service
At its lowest low
The superheater drain______the superheater
Removes gases from
Removes condensate from
Relieves pressure from
Establishes a steam flow through
Establishes a steam flow through
A flash tank_____
Acts as separator
Recovers steam and condensate
Controls blowdown
Recovers low pressure steam
Recovers low pressure steam
A slow opening valve requires_____ complete turns to be fully opened or close
Three
Five
Seven
Nine
Five
According to the ASME code the maximum size of the boiler bottom blowdown line is_____
1 1/2”
2”
2 1/2”
3”
2 1/2”
When testing the safety valve by hand______
There should be no pressure on the boiler
Notify the boiler inspector
The boiler should be at least 75% of popping pressure before testing
The boiler should be at least 75% of popping pressure before testing
An automatic nonreturn valve is found on the_____
Discharge size of the feedwater pump
Inlet line to the open feedwater heater
Boiler main steam line between the boiler and the main stop valve
Boiler main steam line between the boiler and the main stop valve
A Broken baffle in a watertube boiler causes
Smoke to come from the chimney
A rise in chimney temperature
A drop in chimney temperature
A rise in chimney temperature
A safe maximum water concentration of contaminates in steam generator serving low makeup plants is maintained by______
Daily blowdown
Continues blowdown
Surface blowdown
Continues blowdown
An automatic nonreturn valve is used with
Engine
Pump
Boiler
Condenser
Boiler
Draft is measured with a______
Pyrometer
Hydrometer
Manometer
Pressure gauge
Manometer
A dry pipe_____
Removes moisture from the steam
Connects the dry drum to the steam and water drum
Increase water circulation
Removes moisture from the steam
A hot water boiler is rated at 32,000,000 btu’s/hr, the equivalent boiler horsepower is
Divided by
33,000
33,475
- 5
- 3
33,475
A steam boiler is rated at 50,000 lbs of steam/hr. What is the boiler horsepower
Divide by
970.3
33,000
34.5
34.5
A boiler has a pressure of 600 psi and a 3 inch diameter safety valve disc. What is the total force acting on the safety valve
.7854 x3x3= times 600 psi
How high is a column of water that exerts 42.43 psi on a gauge located at the bottom of the column
Times
Times 2.31
Before blowing tubes in a boiler equipped with steam soot blowers, you should____
Increase boiler ester level
Decrease the boiler water level
Reduce the forced draft fam speed
Increase the boiler water level
Bicolor water level indicator connected directly to the boiler drum operates on the principle of
Different refractive properties of steam
Special insoluble
Indicating fluids
Different refractive properties of steam
The purpose of the mica used in a gauge glass assembly is to prevent______the glass
Overheating of
Light refraction in
Etching of
Leakage from
Etching of
