1|Page
DC BOILER EXAM LATEST 2026 ACTUAL EXAM WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS (100% VERIFIED
ANSWERS) |ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
A ___ is a valve connected to the top of a boiler that allows air to
be removed from the boiler when filling and heating and allows air
to be drawn in when the pressure drops during cool-down or
when draining the boiler. - ANSWER-boiler vent
Saturation temperature is the temperature at which ___. -
ANSWER-water and steam are at the same pressure
Steam ___ is the condition where steam strikes a metal surface,
causing erosion of that surface. - ANSWER-impingement
If steam has a quality of 98%, it contains 2% ___. - ANSWER-
water
A(n) ___ is used to directly measure the moisture content in
steam. - ANSWER-Throttling Calorimeter
,2|Page
A superheater is a bank of tubes through which steam passes
___. - ANSWER-after leaving the boiler where additional heat is
added to the steam
A consistent steam temperature during fluctuations in load can be
maintained by using ___. - ANSWER-both radiant and conversion
superheaters in the same unit
A superheater safety valve must be of sufficient capacity to relieve
___% of the steam that the boiler can produce. - ANSWER-25
The flow of steam through a superheater should never be less
than ___% of boiler capacity. - ANSWER-25
A(n) ___ routes steam back through coils of submerged piping
within the steam drum. - ANSWER-drum desuperheater
In an average steam turbine, there is a gain of about ___% in
efficiency for every 35°F of superheat. - ANSWER-1
,3|Page
Noncondensing steam turbines are normally used in steam plants
that require large amounts of ___. - ANSWER-low-pressure
process or heating steam
Condensing steam turbines are commonly used on medium to
large units and operate with an exhaust pressure of ___ vacuum.
- ANSWER-26 in. Hg to 29 in. Hg
To produce the force in an impulse steam turbine, a ___ is located
before each stage. - ANSWER-nozzle
Most steam turbines are designed to have a steam velocity that is
___. - ANSWER-twice as great as the blade velocity
___ is a method in which the energy from steam is extracted
using multiple stages in a turbine to reduce the steam velocity and
pressure in a short time. - ANSWER-velocity compounding
, 4|Page
___ steam is steam that is removed from the turbine at a
controlled pressure after it has passed through some of the
turbine stages. - ANSWER-extraction
The temperature drop across a steam is called ___. - ANSWER-
subcooling
Most thermostatic steam traps operate with ___ subcooling. -
ANSWER-20°F to 40°F
Float thermostatic steam traps are generally used in plants with
pressures up to ___ psi. - ANSWER-125
A(n) ___ steam trap has no condensate backup. - ANSWER-
inverted bucket
Bimetallic steam traps normally operate with ___ subcooling. -
ANSWER-50°F to 100°F
DC BOILER EXAM LATEST 2026 ACTUAL EXAM WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS (100% VERIFIED
ANSWERS) |ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
A ___ is a valve connected to the top of a boiler that allows air to
be removed from the boiler when filling and heating and allows air
to be drawn in when the pressure drops during cool-down or
when draining the boiler. - ANSWER-boiler vent
Saturation temperature is the temperature at which ___. -
ANSWER-water and steam are at the same pressure
Steam ___ is the condition where steam strikes a metal surface,
causing erosion of that surface. - ANSWER-impingement
If steam has a quality of 98%, it contains 2% ___. - ANSWER-
water
A(n) ___ is used to directly measure the moisture content in
steam. - ANSWER-Throttling Calorimeter
,2|Page
A superheater is a bank of tubes through which steam passes
___. - ANSWER-after leaving the boiler where additional heat is
added to the steam
A consistent steam temperature during fluctuations in load can be
maintained by using ___. - ANSWER-both radiant and conversion
superheaters in the same unit
A superheater safety valve must be of sufficient capacity to relieve
___% of the steam that the boiler can produce. - ANSWER-25
The flow of steam through a superheater should never be less
than ___% of boiler capacity. - ANSWER-25
A(n) ___ routes steam back through coils of submerged piping
within the steam drum. - ANSWER-drum desuperheater
In an average steam turbine, there is a gain of about ___% in
efficiency for every 35°F of superheat. - ANSWER-1
,3|Page
Noncondensing steam turbines are normally used in steam plants
that require large amounts of ___. - ANSWER-low-pressure
process or heating steam
Condensing steam turbines are commonly used on medium to
large units and operate with an exhaust pressure of ___ vacuum.
- ANSWER-26 in. Hg to 29 in. Hg
To produce the force in an impulse steam turbine, a ___ is located
before each stage. - ANSWER-nozzle
Most steam turbines are designed to have a steam velocity that is
___. - ANSWER-twice as great as the blade velocity
___ is a method in which the energy from steam is extracted
using multiple stages in a turbine to reduce the steam velocity and
pressure in a short time. - ANSWER-velocity compounding
, 4|Page
___ steam is steam that is removed from the turbine at a
controlled pressure after it has passed through some of the
turbine stages. - ANSWER-extraction
The temperature drop across a steam is called ___. - ANSWER-
subcooling
Most thermostatic steam traps operate with ___ subcooling. -
ANSWER-20°F to 40°F
Float thermostatic steam traps are generally used in plants with
pressures up to ___ psi. - ANSWER-125
A(n) ___ steam trap has no condensate backup. - ANSWER-
inverted bucket
Bimetallic steam traps normally operate with ___ subcooling. -
ANSWER-50°F to 100°F
