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WorksheetsBoilers Important Quiz 1
Total questions: 10
Worksheet time: 5mins
Why is high-quality still used to make boilers
Its cheaper to produce
It's easier to bend and use in the manufacturing process
Because boilers are subjected to high stress and heat during operation
to reduce cost
which has more effect on a boiler shell
pressure
temperature
both temperature and pressure have the same effect
all of the above
why is riveting no longer used on a boiler
because it's more expensive than welding
because its slower during production of a boiler
because the seams are weaker than if they were welded
because rivets are no longer used
What forces are a boiler subjected to during operation
compression
tension
shear
all of the above
what do we mean by stress relieving on a boiler
it is putting the boiler under an extremely high steam pressure to make sure you have no leaks
it is placing the boiler inside and oven to at least 1100 degrees for a specified time depending on the metal thickness to relieve the concentrated stresses
checking the boiler seams with x-rays
none of the above
Fire tubes in a fire tube boiler are
rolled
beaded
flared
all of the above
water tubes placed inside of a water tube boiler are
rolled only
beaded only
rolled and flared
none of the above
Why do nearly all tube leaks occur in a firetube boiler at the tube ends
the metal is thinner in this area
the water around the tubes causes them to corrode
the tubes expand and contract more in the tube sheet than in the shell area
they were not installed properly
Why are diagonal stays and horizontal through stays used on fire tube boilers
As braces on the upper portion of the boiler drum to prevent it from bulging outward
so the metal of the heads on the boiler can be made of thinner metal
so that if the boiler is relocated to another facility it would prevent the heads from shifting
none of the above
a staybolt that has a small hole drilled in the center is
a staybolt
a telltale stay
a diagonal stay
a through stay
