Page 1 of 27
DC 1ST CLASS BOILER| DC THIRD CLASS
STATIONARY BOILER EXAM PRACTICE
QUESTIONS WITH VERIFIED SOLUTIONS
The ______ pump supplies the water to the condenser to condense the steam. --
ANSWER--Condensate
What is the first thing that happen for a three-element regulator to change the
output of the controller? -- ANSWER--Condensate Flow Increases
The primary reason for using wet scrubbers is to ? -- ANSWER--Remove flue
gas particulates
What is used on the outer rim of the blades or nozzles to stiffen the blade
against vibration and confine the steam to the ________ ? -- ANSWER--Shroud
Ring
The refrigerant in a condenser to usually sub cooled between _________ degree
F below the condensing temperature? -- ANSWER--.7 to 9 degrees
if you are operation a boiler with a three-element feed water regulator, when is
being measured and recorded by mechanically operated water ? -- ANSWER-
Steam Flow, Feedwater and drum level
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given thermocouples have both a hot junction and a cold junction. the cold
junction measured the ____________ point ? -- ANSWER--Reference
A water heating system that uses the same pipe for supply and return is called a
__________ system -- ANSWER--One pipe
a malfunction in the deaerate feed water tank is indicated by ? -- ANSWER-
Boiler requiring excessive amount of oxygen scavenge chemicals.
what uses the theory of centirifical force that applies to the roating element of
turbine and controls the speed of the turbine? -- ANSWER--Speed Governor
which of the following is a technique is control nitrous oxide emissions? --
ANSWER--S.C.R Selective Catalytic
a boiler is steaming at 50% of the load, and suddenly the fire goes out, in this
case what happens to the water level? -- ANSWER--water shrinks and trips the
LWCO
The function of the diffuser of the diffuser on a turbine type centrifugal pump is
to? -- ANSWER--convert high velocity to pressure
, Page 3 of 27
for what is the turbine extraction steam used? -- ANSWER--heating boiler feed
water
all of the following are types of synthetic refrigerant oil except? -- ANSWER-
Naphthenic
how do you ensure
that complete combustion will take place in the combustion chamber? --
ANSWER--increase excess air
to protect a circuit from over current fuses are connected in? -- ANSWER-series
which coal has the highest volume of carbon ? -- ANSWER--anthracite
which of the following are the correct definition of "Critical Pressure" and
critical temperature -- ANSWER--critical pressure is pressure at which water
and steam have the same density ect....
which of the following type of pumps can be started with the discharge valve
closed ? -- ANSWER--centrifugal
a chiller water coil is an example of _________ dehumidification? --
ANSWER--mechanical
DC 1ST CLASS BOILER| DC THIRD CLASS
STATIONARY BOILER EXAM PRACTICE
QUESTIONS WITH VERIFIED SOLUTIONS
The ______ pump supplies the water to the condenser to condense the steam. --
ANSWER--Condensate
What is the first thing that happen for a three-element regulator to change the
output of the controller? -- ANSWER--Condensate Flow Increases
The primary reason for using wet scrubbers is to ? -- ANSWER--Remove flue
gas particulates
What is used on the outer rim of the blades or nozzles to stiffen the blade
against vibration and confine the steam to the ________ ? -- ANSWER--Shroud
Ring
The refrigerant in a condenser to usually sub cooled between _________ degree
F below the condensing temperature? -- ANSWER--.7 to 9 degrees
if you are operation a boiler with a three-element feed water regulator, when is
being measured and recorded by mechanically operated water ? -- ANSWER-
Steam Flow, Feedwater and drum level
,Page 2 of 27
given thermocouples have both a hot junction and a cold junction. the cold
junction measured the ____________ point ? -- ANSWER--Reference
A water heating system that uses the same pipe for supply and return is called a
__________ system -- ANSWER--One pipe
a malfunction in the deaerate feed water tank is indicated by ? -- ANSWER-
Boiler requiring excessive amount of oxygen scavenge chemicals.
what uses the theory of centirifical force that applies to the roating element of
turbine and controls the speed of the turbine? -- ANSWER--Speed Governor
which of the following is a technique is control nitrous oxide emissions? --
ANSWER--S.C.R Selective Catalytic
a boiler is steaming at 50% of the load, and suddenly the fire goes out, in this
case what happens to the water level? -- ANSWER--water shrinks and trips the
LWCO
The function of the diffuser of the diffuser on a turbine type centrifugal pump is
to? -- ANSWER--convert high velocity to pressure
, Page 3 of 27
for what is the turbine extraction steam used? -- ANSWER--heating boiler feed
water
all of the following are types of synthetic refrigerant oil except? -- ANSWER-
Naphthenic
how do you ensure
that complete combustion will take place in the combustion chamber? --
ANSWER--increase excess air
to protect a circuit from over current fuses are connected in? -- ANSWER-series
which coal has the highest volume of carbon ? -- ANSWER--anthracite
which of the following are the correct definition of "Critical Pressure" and
critical temperature -- ANSWER--critical pressure is pressure at which water
and steam have the same density ect....
which of the following type of pumps can be started with the discharge valve
closed ? -- ANSWER--centrifugal
a chiller water coil is an example of _________ dehumidification? --
ANSWER--mechanical
