Steam Boilers Tech Check 3 Flashcards
A boiler generating 20,000 lb of steam ust be supplied with at least
A. 1Mh times its MAWP
B. 10,000 lb of water/hr
C. 20,000 lb of waterhr
D. 20,000 lb of water per shift
C. 20,000 lb of waterhr
oxygen and other noncondensable gases are separated from the feedwater
A. in the closed feedwater heater
B. in the economizer
C. in the open dearator feedwater heater
D by using steam traps
C. in the open dearator feedwater heater
The four systems required to operate a steam boiler are
A. steam, exhaust, condensate, and return
B. fuel, condensate, air, and return
C. steam, feedwater, fuel, and draft
D. steam, condensate, fuel, and draft
C. steam, feedwater, fuel, and draft
In order to produce one pound of steam, it is necessary to evaporate
A. 144 Btu
B. 970.3 Btu
C. 1 lb of water
D. 3 lb of water
C. 1 lb of water
Steam that has lost its heat and has turned back into water is
A returned steam
B. condensate
C. exhaust steam
D reclaimed steam
B. condensate
Steam is extracted from the turbine after it has passed through some of the turbine stages to
A. reduce back pressure
B. increase back pressure
C. prevent excessive speed within the turbine
D. be used for process work and heating
D. be used for process work and heating
Water from an open deaerating feedwater heater flows
A. to a closed feedwater heater
B. to the boiler
C. to the feedwater pump
D. directly to the sewer
C. to the feedwater pump
A safe and efficient boiler plant should include pump(s)
A, one steam and one electric feedwater
B, two steam feedwater (reciprocating)
C. one steam turbine and one steam reciprocating
D. two electric high-capacity feedwater
A, one steam and one electric feedwater
A surface condenser has water
A, and steam mixed together to ereate a vacuum
B. passed around the tubes with steam inside the tubes to create a vacuum
C. and air mixed to create a vacuum
D passed through tubes to cause steam to condense, causing a vacuum
D passed through tubes to cause steam to condense, causing a vacuum
On the feedwater line near the boil a valve and a stop valve The valve closest to the shell of the boiler is the
valve.
A. check
B. stop
C. automatic nonreturn
D. no valves are allowed on this line
B. stop
On a boiler burning low pressure gas, the volume (amount) of gas burned is controlled by the
A, pressure-regulating valve
B. pressure reducing governor tube
c. volume of air passing through the venturi
D., manual reset valve
c. volume of air passing through the venturi
On the fuel oil system, the purpose of the duplex strainers on the suction line between the tank and fuel oil pump is to
A. isolate the system in the event of fire
B. allow one strainer to be cleaned without securing the boiler
C. to remove water from the fuel oil
D. prevent return flow to the tank
B. allow one strainer to be cleaned without securing the boiler
A draft fan located between the boiler and chimney is used in a(n) draft system.
A, natural
B. forced
C. induced
D. furnace induction
C. induced
When steam is superheated it has
A, higher pressure, thus producing more work
B. a large volume
C. more heat energy, thus producing more work
D a higher temperature and pressure
C. more heat energy, thus producing more work
The vacuum on the exhaust side of the turbine
A. reduces back pressure and steam flow rate
B, reduces back pressure and increases water rate
C. prevents excessive speed within the turbine
D vacuum is never allowed on a turbine
A. reduces back pressure and steam flow rate
The open feedwater heater is located
A. above the feedwater pump (s)
B. below the feedwater pump(s)
C, after the closed feedwater heater
D, none of the above
A. above the feedwater pump (s)
No. fuel oil must be heated in order to be pumped.
A.2
B. 4
D, 6
D, 6
Coal stokers were developed because
A. all grades of coal could be burned
B. coal is easy to burn
C. coal has less sulfur than fuel oil or gas
D. hand firing was inefficient in larger-sized boilers
D. hand firing was inefficient in larger-sized boilers
Pulverized coal has the consistency of talcum powder so that it
A. can be stored more easily
B. can come in closer contact with the oxygen for complete combustion
C. can burn better on the grates
D is easier to hand fire
B. can come in closer contact with the oxygen for complete combustion
Draft is defined as a difference in pressure that causes
A. air or gases to flow
B. a balance of pressure
C. a back pressure
D. none of the above
A. air or gases to flow
Air is mixed inside of the burner register in a gas system.
A. low pressure
B. high pressure
C. equalizing
D. fuel oil
B. high pressure
Natural draft is produced by a
A. forced draft fan
B. induced draft fan (used in larger plants)
C, difference in temperature of a column of gas inside the chimney from a column of air outside the chimney
D., clean coal bed
C, difference in temperature of a column of gas inside the chimney from a column of air outside the chimney
Pulverized coal is burned in
in the furnace.
A. the scale
B. the grates
C. suspension
D large particles
C. suspension
Gas leaks should be located and repaired by a
A. boiler operator
B. shift foreman
C. fuel superintendent
D gas company representative
D gas company representative
Water weighs approximately lb/gal
A. 2
B. 6.4
C. 8.3
D. 10
C. 8.3
