Exam (elaborations)
POWER ENGINEERING TECHNOLOGY (PET YR 1): 4B POWER BOILERS EXAM
- Course
- Institution
POWER ENGINEERING TECHNOLOGY (PET YR 1): 4B POWER BOILERS EXAM
[Show more]
Content preview
POWER ENGINEERING TECHNOLOGY(PET YR 1): 4B POWER BOILERS EXAM
A6boiler6with6a6single6safety6valve6has6a6MAWP6or610006kPa.6What6is6the6maximum6boil
er6pressure6permissible6when6the6safety6valve6is6blowing?
a.610606kPa
b.610006kPa
c.610306kPa
d.611006kPa6-6ans--a
If6a6high6pressure6boiler6is6on6high6fire6with6the6main6steam6stop6valve6closed,6the6safety6
valves6must6ensure6that6the:
a.6boiler6pressure6does6not6exceed6the6maximum6allowable6working6pressure6of6the6boil
er6by6more6than66%
b.6boiler6pressure6does6not6exceed6the6set6point6of6the6safety6valve
c.6steam6pressure6does6not6exceed6the6MAWP6of6the6boiler
d.6boiler6pressure6does6not6exceed6the6hydrostatic6test6pressure6-6ans--a
If6a6boilers6safety6valves6have6insufficient6relief6capacity,6the6boiler6pressure6may:
a.6not6rude6more6than615%6of6the6MAWP
b.6remain6at6the6MAWP
c.6force6water6from6the6boiler6causing6a6low6water6condition
d.6rise6more6than66%6of6the6MAWP6-6ans--d
The6blowdown6on6a6safety6valve6is6adjusted6by6turning6the:
a.6valve6disc
b.6adjusting6nut
c.6adjusting6ring
d.6valve6seat6-6ans--c
The6popping6pressure6of6a6safety6valve6____________6without6replacing6its6spring.
a.6cannot6be6changed
b.6can6only6be6increased6by65%
c.6can6only6be6decreased6by65%
d.6can6be6changed6by6plus6or6minus65%6-6ans--d
The6safety6valves6on6a6boiler6are6set6to6open6at613806kPa.6The6boiler6MAWP6is613806kP
a.6How6much6higher6can6the6boiler6pressure6rise6above613806kPa6if6it6is6fired6at6full6capa
city6with6the6steam6outlet6valve6closed?
a.637.56kPa
b.641.46kPa
c.606kPa
,d.682.86kPa6-6ans--d
What6is6responsible6for6the6popping6action6of6a6safety6valve?
a.6amount6of6spring6compression
b.6blow6down6ring6adjustment
c.6a6lip6on6the6valve6disc
d.6temperature6of6the6steam6-6ans--c
To6increase6the6opening6pressure6of6a6safety6valve:
a.6raise6the6blowdown6ring
b.6increase6spring6compression
c.6reduce6spring6compression
d.6lower6the6blowdown6ring6-6ans--b
A6safety6relief6valve6is6similar6to6a6safety6valve6except6that6it:
a.6does6not6have6a6blowdown6ring6or6bottom6guides
b.6must6have6greater6blowdown
c.6may6have6an6isolation6valve6placed6between6it6and6the6pressure6vessel
d.6must6discharge6directly6to6the6atmosphere6-6ans--a
When6is6a6stop6valve6allowed6between6a6heating6boilers6safety6valve6and6the6boiler6dru
m?
a.6only6if6the6stop6valve6is6locked6open
b.6if6there6is6more6than6one6safety6valve
c.6never
d.6if6the6stop6valve6is6the6quick6opening6design6-6ans--c
If6a6safety6valve6leaks6after6a6try6lever6test,6the6operator6should:6
a.6reduce6the6boiler6pressure
b.6operate6the6try6lever6several6times6to6blow6away6foreign6material
c.6for6a6gag6to6the6safety6valve
d.6reduce6boiler6pressure6and6call6the6chief6engineer6-6ans--b
Temperature6relief6devices6can6open6on6a6rise6in6temperature6by6the6expansion6of6a6wax
6filled6rod6or6by6the:
a.6melting6of6the6alloy6in6a6fusible6plug
b.6melting6of6a6fusible6link
c.6action6of6a6bi6metal6strip
d.6action6of6a6bellows6-6ans--a
A6high6gas6pressure6fuel6cut6off6switch:
a.6closes6when6gas6pressure6is6too6high
b.6automatically6resets6itself6when6the6gas6pressure6is6restored
c.6is6located6upstream6of6the6automatic6fuel6valve
d.6prevents6excessive6fuel6pressure6from6creating6an6unstable6flame6condition6-6ans--d
, A6flame6failure6device6is6unresponsive6to:6
a)6ultraviolet6light6
b)6infra-red6light6
c)6visible6light6
d)6fuel6flow6-6ans--d
A6photoelectric6flame6scanner:
a.6uses6a6pilot6stat
b.6conducts6current6through6the6flame
c.6requires6a6clear6line6of6sight6to6the6flame
d.6produces6a6steady6voltage6signal6-6ans--c
All6flame6safeguard6devices6have6the6following6in6common:
a.6close6the6safety6shut6off6valves6in6case6of6pilot6flame6failure6or6main6burner6failure
b.6are6limited6to6temperature6comfortable6to6the6hand
c.6monitor6the6pilot6flame6and6main6burner6simultaneously
d.6activate6an6alarm6system6if6flame6failure6is6detected6-6ans--a
If6a6shutdown6occurs6during6normal6firing6of6a6boiler6and6the6steam6pressure6is6below6th
e6normal6cut6off6value,6the6problem6could6be:6
a.6an6interlock6such6as6the6combustion6air6proving6switch6has6failed
b.6main6flame6trial6failure
c.6pilot6flame6trial6failure
d.6igniter6transformer6failure6-6ans--a
A6low6fire6start6switch
a.6is6a6type6of6manual6over6ride
b.6ensures6the6purge6takes6place6with6the6damper6in6the6low6fire6position
c.6acts6as6a6pre6ignition6interlock6to6ensure6minimum6damper6setting6during6ignition6
d.6is6closed6when6the6damper6is6at6high6fire6-6ans--c
The6primary6function6of6a6burner6management6system6is6to:
a.6alert6the6operator6of6adverse6operating6conditions
b.6maintain6the6air-fuel6ratio6of6the6burner
c.6start6of6stop6a6burner6following6a6safe6sequence
d.6regulate6the6air6flow6and6the6fuel6flow6in6accordance6with6steam6demand6-6ans--c
When6an6automatic6unattended6boiler6starts6up,6the6programming6control6will6first:
a.6energize6the6ignition6transformer6and6pilot6gas6solenoid6valve
b.6start6the6post6purge6period
c.6start6the6forced6draft6fan
d.6energize6the6main6gas6valve6-6ans--c
At6the6end6of6the6pre6purge6period,6the6programming6control:
a.6opens6the6main6fuel6valve
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller AGRADEPROMASTER. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67096 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now