Steam Boilers Tech Check 4 Flashcards
The automatic city water makeup valve found on an open feedwater heater is used to
A. add city water to the boiler if returns are low
B. maintain a water level in the feedwater heater if there are insufficient condensate returns
C. start and stop the feedwater pump on demand
boiler
D. never found on open feedwater heaters
B. maintain a water level in the feedwater heater if there are insufficient condensate returns
The purpose of a feedwater regulator is to
A. shut down the boiler in the event of low water
B. prevent a furnace explosion
C. control water level in the feedwater heater
D, maintain a consistent water level in the boiler
D, maintain a consistent water level in the boiler
Feedwater regulator sensing elements are located
A. on the steam line
B. on the water line
C. on the blowdown line
D. at the NowL
D. at the NowL
The sequence of three numbers found on the data plate attached to a reciprocating feedwater pump indicates the
A. area of steam piston, area of water piston, and length of pump stroke
B. area of water piston, area of steam piston, and length of pump stroke
C. diameter of water piston, diameter of steam piston, and length of pump stroke
D, diameter of steam piston, diameter of water piston, and length of pump stroke
D, diameter of steam piston, diameter of water piston, and length
A(n) draft fan must be used to overcome resistance caused by gases of combustion leaving the boiler when an economizer is used.
A. induced
B. forced
C. natural
D. natural and forced
A. induced
A reciprocating feedwater pump must have a safety relief valve located between the
A pump discharge valve and the bailer
B, pump and the discharge valve
C. pump and the open feedwater heater
D because the reciprocating feedwater pump is a positive displacement pump, no safety relief valve is needed
B, pump and the discharge valve
An economizer is used in large boiler plants to heat
A fuel oil using flue gas temperature
B. air for combustion
C. feedwater using gases of combustion
D. steam before it enters the superheater
C. feedwater using gases of combustion
The theory of operation of a centrifugal pump is that the centrifugal force of a rotating element
A. will overcome kinetie energy
B. is converted into pressure
C will be less than potential energy
D is equal to atmospheric pressure
B. is converted into pressure
Centrifugal feedwater pumps can be started with their discharge valves
A. open
B. partly open
C, open or closed
D. they have no discharge valve
C, open or closed
A turbine feedwater pump differs from a centrifugal feedwater pump in that it is a
A. nonpositive displacement pump
B. positive displacement pump
C. pump that can only be steam driven
D. straight mechanical drive pump
B. positive displacement pump
To protect the turbine pump from excessive pressure, a(n)
A. safety relief valve must be installed on the discharge line
B. bypass line is installed
C. pump governor is installed
D. overs peed trip is installed
A. safety relief valve must be installed on the discharge line
The feedwater stop valve on the feedwater line is located closest to the shell of the boiler so that the
A. operator can reach it
B. boiler can be taken offline
C. check valve can be repaired without taking the boiler off-line
D. no valves are allowed between the boiler and the feedwater pump
C. check valve can be repaired without taking the boiler off-line
Water temperature that is too high in the open feedwater heater could cause
A. oxygen pitting in the boiler
B. thermal shock to the boiler
C. the feedwater pump to become steambound
D. the feedwater pump to become waterbound
C. the feedwater pump to become steambound
Water temperature that is too low in the open feedwater heater could cause
A. oxygen pitting in the boiler
B. the feedwater pump to become steambound
C. the feedwater pump to become waterbound.
D. no problem; extra heat would be made up in the combustion chamber
A. oxygen pitting in the boiler
By maintaining a constant water level in a boiler, it is possible to reduce
A. fuel consumption
B. thermal shock to boiler metal
C. the chance of high or low water in the boiler
D. all of the above
D. all of the above
