Boilermaker Exam Questions & Answers
(Grade A+)
The types of tray used in distillation columns are -
correct answer ✅sieve, valve and bubble-cap
sieve tray -
correct answer ✅A metal plate containing drilled holes through
which the rising vapour can pass into the liquid flowing across the
tray.
valve tray -
correct answer ✅Is fitted with a flapper valve which opens as
vapour passes through the hole.
valve tray -
correct answer ✅This type is used where vapour velocity is not
constant and prevent liquid from dumping through the holes at
times of low gas velocity.
bubble-cap -
correct answer ✅It consists of a number of 'Chimneys' or 'Risers'
(small, short pipes set into the tray), through which the vapour can
pass.
,Boilermaker Exam Questions & Answers
(Grade A+)
weir -
correct answer ✅Maintains the liquid level on the tray.
downcomer -
correct answer ✅Carries the liquid down to the tray below, acting
as a seal to prevent gas from bypassing the tray above.
tray type tower -
correct answer ✅Is a tall, cylindrical column. Inside, a series of
trays are placed, one above the other. They are used to bring the
rising vapour and falling liquid into intimate contact.
packed type tower -
correct answer ✅Is a vertical, steel column which contains 'Beds'
of packing material which are used to bring the rising vapours into
intimate contact with falling liquid within the tower. The heat
added to the mixture before entering the tower partially vaporises
the mixture and the vapours rise up the tower and begin to cool.
Cross-Bolting -
correct answer ✅The proper tightening sequence for a flange is a
______________pattern.
,Boilermaker Exam Questions & Answers
(Grade A+)
Torque -
correct answer ✅The proper amount of tightening force for a
flange is know as the _______________.
Safety Relief Valves -
correct answer ✅Are installed on equipment to prevent over-
pressure (or excess vacuum), which could cause damage, rupture or
collapse of the equipment.
Glove valve -
correct answer ✅Is used where control of fluid flow or pressure is
required and it can be operated in any position between open and
closed.
Gate valve -
correct answer ✅Is the most common type of valve in use in
industry and is used to start or stop the flow of fluids. It gives a
positive shut-off when closed and is often used as a 'Block Valve' for
isolating systems.
Check valve -
correct answer ✅These valves will allow fluid flow in ONE
DIRECTION ONLY. Their purpose is to prevent backflow
, Boilermaker Exam Questions & Answers
(Grade A+)
heat exchanger -
correct answer ✅Is a device used to transfer heat between one or
more fluids. The fluids may be separated by a solid wall to prevent
mixing or they may be in direct contact.
riley underfeed -
correct answer ✅A stoker is fitted with secondary pusher blocks.
This type would be know as a(n)
traveling grate -
correct answer ✅The type of mechanical stoker which uses hollow
grate bars is the ______________ stoker.
easier to clean fires -
correct answer ✅What is the advantage of dump grates over
stationary grates?
air pressure would decrease -
correct answer ✅If the ash pit is NOT continually cleaned on a
boiler having dump grates_________________.
(Grade A+)
The types of tray used in distillation columns are -
correct answer ✅sieve, valve and bubble-cap
sieve tray -
correct answer ✅A metal plate containing drilled holes through
which the rising vapour can pass into the liquid flowing across the
tray.
valve tray -
correct answer ✅Is fitted with a flapper valve which opens as
vapour passes through the hole.
valve tray -
correct answer ✅This type is used where vapour velocity is not
constant and prevent liquid from dumping through the holes at
times of low gas velocity.
bubble-cap -
correct answer ✅It consists of a number of 'Chimneys' or 'Risers'
(small, short pipes set into the tray), through which the vapour can
pass.
,Boilermaker Exam Questions & Answers
(Grade A+)
weir -
correct answer ✅Maintains the liquid level on the tray.
downcomer -
correct answer ✅Carries the liquid down to the tray below, acting
as a seal to prevent gas from bypassing the tray above.
tray type tower -
correct answer ✅Is a tall, cylindrical column. Inside, a series of
trays are placed, one above the other. They are used to bring the
rising vapour and falling liquid into intimate contact.
packed type tower -
correct answer ✅Is a vertical, steel column which contains 'Beds'
of packing material which are used to bring the rising vapours into
intimate contact with falling liquid within the tower. The heat
added to the mixture before entering the tower partially vaporises
the mixture and the vapours rise up the tower and begin to cool.
Cross-Bolting -
correct answer ✅The proper tightening sequence for a flange is a
______________pattern.
,Boilermaker Exam Questions & Answers
(Grade A+)
Torque -
correct answer ✅The proper amount of tightening force for a
flange is know as the _______________.
Safety Relief Valves -
correct answer ✅Are installed on equipment to prevent over-
pressure (or excess vacuum), which could cause damage, rupture or
collapse of the equipment.
Glove valve -
correct answer ✅Is used where control of fluid flow or pressure is
required and it can be operated in any position between open and
closed.
Gate valve -
correct answer ✅Is the most common type of valve in use in
industry and is used to start or stop the flow of fluids. It gives a
positive shut-off when closed and is often used as a 'Block Valve' for
isolating systems.
Check valve -
correct answer ✅These valves will allow fluid flow in ONE
DIRECTION ONLY. Their purpose is to prevent backflow
, Boilermaker Exam Questions & Answers
(Grade A+)
heat exchanger -
correct answer ✅Is a device used to transfer heat between one or
more fluids. The fluids may be separated by a solid wall to prevent
mixing or they may be in direct contact.
riley underfeed -
correct answer ✅A stoker is fitted with secondary pusher blocks.
This type would be know as a(n)
traveling grate -
correct answer ✅The type of mechanical stoker which uses hollow
grate bars is the ______________ stoker.
easier to clean fires -
correct answer ✅What is the advantage of dump grates over
stationary grates?
air pressure would decrease -
correct answer ✅If the ash pit is NOT continually cleaned on a
boiler having dump grates_________________.
