Power Engineering 3A1 ch 11-15 Questions With Complete
Solutions
Sand and silica can dissolve in water but will not deposit in
boiler tubes during the heating and boiling process. They will be
carried over with the steam and collect in the condensate return
system.
a. True
b. False
b
The silica that is carried over in the steam will cause?
a. Glass like deposits on the turbine blades reducing efficiencies
and increasing the potential for blade failures.
b. Only minor wear over time with some efficiency losses.
c. Pluggage in the small nozzles and governor valves
d. No real noticeable problems in this area.
a
Corrosion is defined as?
a. The loss of metal or wall thickness due to the flow of abrasive
materials.
b. The destruction of a metal by overheating
c. The destruction of a metal by chemical or electrochemical
reaction with its environment.
,d. The combination of a metal with other materials which cause
the metal to become harder.
c
In the petrochemical industry many different products are
developed by?
a. Adding or removing electrons from the hydrocarbon elements.
b. Separating the various elements into their final end products.
c. Rearranging the carbon and hydrogen molecular structures to
give the desired end products.
d. Sub-cooling the elements to get them to separate into their
end products.
c
White liquor which is used in Kraft pulp mills to cook the wood
chips is made up of a mixture of?
a. Sodium hydroxide, sodium sulphide and water.
b. Sodium hydroxide, sodium chloride and water.
c. Sodium chloride, sodium sulphite and water.
d. Sodium chloride, sodium sulphide and black liquor.
a
The gases present in water which can cause problems in a steam
are:
1. Oxygen
2. Carbon dioxide
3. Carbon monoxide
,4. Hydrogen
a. 1, 2
b. 1, 3
c. 2, 3
d. 2, 4
a
A butane molecule is a straight chain hydrocarbon molecule
which has the following chemical formula and structure:
a. Chemical formula = C4 H10 , structure =
b. Chemical formula = C3 H8, Structure =
c. Chemical formula = C3 H8, Structure =
d. Chemical formula = C4 H8, Structure =
a
In order for a chemical equation to be balanced
_______________.
a. weights must be added to the beam
b. the ductile components must be removed
c. physical changes are excluded
d. equal numbers of atoms must appear on both sides
e. equal numbers of molecules must appear on both sides
d
The compound of carbon, responsible for corrosion difficulties
in a power plant is:
, a. Graphite
b. Carbon dioxide
c. Charcoal
d. Carbon
b
The term "plasticity" is applied to material which
____________________.
a. is brittle in its composition
b. is not capable of being reshaped
c. will return to its original shape after being deformed
d. will return to its original shape after the yield point is reached
e. will not return to its original shape after being deformed
e
Elasticity is the property a body possesses that allows
_________________________.
a. the body to return to its original shape after being deformed
b. the body to withstand great deformation under high loads
before rupturing
c. the body to be rolled into the desired shape without breaking
d. the body to remain deformed after the effort causing
deformation is removed
e. the body to return to its original shape before the yield point is
reached
a
Solutions
Sand and silica can dissolve in water but will not deposit in
boiler tubes during the heating and boiling process. They will be
carried over with the steam and collect in the condensate return
system.
a. True
b. False
b
The silica that is carried over in the steam will cause?
a. Glass like deposits on the turbine blades reducing efficiencies
and increasing the potential for blade failures.
b. Only minor wear over time with some efficiency losses.
c. Pluggage in the small nozzles and governor valves
d. No real noticeable problems in this area.
a
Corrosion is defined as?
a. The loss of metal or wall thickness due to the flow of abrasive
materials.
b. The destruction of a metal by overheating
c. The destruction of a metal by chemical or electrochemical
reaction with its environment.
,d. The combination of a metal with other materials which cause
the metal to become harder.
c
In the petrochemical industry many different products are
developed by?
a. Adding or removing electrons from the hydrocarbon elements.
b. Separating the various elements into their final end products.
c. Rearranging the carbon and hydrogen molecular structures to
give the desired end products.
d. Sub-cooling the elements to get them to separate into their
end products.
c
White liquor which is used in Kraft pulp mills to cook the wood
chips is made up of a mixture of?
a. Sodium hydroxide, sodium sulphide and water.
b. Sodium hydroxide, sodium chloride and water.
c. Sodium chloride, sodium sulphite and water.
d. Sodium chloride, sodium sulphide and black liquor.
a
The gases present in water which can cause problems in a steam
are:
1. Oxygen
2. Carbon dioxide
3. Carbon monoxide
,4. Hydrogen
a. 1, 2
b. 1, 3
c. 2, 3
d. 2, 4
a
A butane molecule is a straight chain hydrocarbon molecule
which has the following chemical formula and structure:
a. Chemical formula = C4 H10 , structure =
b. Chemical formula = C3 H8, Structure =
c. Chemical formula = C3 H8, Structure =
d. Chemical formula = C4 H8, Structure =
a
In order for a chemical equation to be balanced
_______________.
a. weights must be added to the beam
b. the ductile components must be removed
c. physical changes are excluded
d. equal numbers of atoms must appear on both sides
e. equal numbers of molecules must appear on both sides
d
The compound of carbon, responsible for corrosion difficulties
in a power plant is:
, a. Graphite
b. Carbon dioxide
c. Charcoal
d. Carbon
b
The term "plasticity" is applied to material which
____________________.
a. is brittle in its composition
b. is not capable of being reshaped
c. will return to its original shape after being deformed
d. will return to its original shape after the yield point is reached
e. will not return to its original shape after being deformed
e
Elasticity is the property a body possesses that allows
_________________________.
a. the body to return to its original shape after being deformed
b. the body to withstand great deformation under high loads
before rupturing
c. the body to be rolled into the desired shape without breaking
d. the body to remain deformed after the effort causing
deformation is removed
e. the body to return to its original shape before the yield point is
reached
a
