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3A1 > 501-550 > Flashcards

501-550 Flashcards

1
Q
  1. Chemical compounds are formed by:

a. Mixing of two substances together.
b. Combining of two atoms of a one substance with one atom of another substance.
c. A chemical reaction involving the bonding of atoms of different elements.
d. Heating a mixture of elements to a specific temperature.

A

c. A chemical reaction involving the bonding of atoms of different elements.

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2
Q
  1. If carbon dioxide is present in the steam drums of a boiler this will cause _____________________.

a. corrosion in the steam drum
b. corrosion in the steam header
c. corrosion in the device using the steam
d. corrosion in the return lines

A

d. corrosion in the return lines

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3
Q
  1. The following is a balanced reaction: “One molecule of methane combines with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water.”

a. True
b. False

A

a. True

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4
Q
  1. The molecular mass of a substance can be found by?

a. Adding together the number of protons in each atom in the substance.
b. Adding together the number of atoms in the elements within the substance.
c. Adding together the atomic masses of the atoms of the elements in the chemical formula of the substance.
d. Adding all the atomic masses of the atoms on the right side of the chemical equation and subtracting that from the atomic masses of the atoms on the left side of the chemical equation.

A

c Adding together the atomic masses of the atoms of the elements in the chemical formula of the substance.

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5
Q
  1. The kilomole is defined as the:

a. Quantity of a substance that has a mass in kilograms equal to its molecular mass.
b. Number of molecules of a substance added together to give a balanced chemical equation.
c. Quantity of a substance that equals the atomic mass of the elements in the substance.
d. Number of moles of the substance that is equal to the atomic mass of the substance.

A

a. Quantity of a substance that has a mass in kilograms equal to its molecular mass.

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6
Q
  1. When dissolved in water, acids will yield OH- ions and bases will yield H+ ions.

a. True
b. False

A

b. False

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7
Q
  1. Salts are neutral compounds that, when in solution, will break up or disassociate into?

a. Positively charged ions called anions and negatively charged ions called cations.
b. The original elements from which the salt was formed, each having a neutral electrical charge.
c. Positively charged ions called cations and negatively charged ions called anions.
d. Acids and bases that have no electrical charge.

A

c. Positively charged ions called cations and negatively charged ions called anions.

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8
Q
  1. Hydrocarbon compounds contain?

a. A number of different elements as well as atoms of hydrogen and carbon.
b. Only atoms of carbon and hydrogen.
c. Atoms of carbon, hydrogen, oxygen and nitrogen.
d. Various organic and inorganic elements.

A

b. Only atoms of carbon and hydrogen.

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9
Q
  1. To stabilize itself the hydrogen and carbon atoms combine and _______________________.

a. form non-organic compounds
b. share electrons between themselves
c. share protons between themselves
d. the hydrogen atoms give up two electrons to the carbon atom

A

b. share electrons between themselves

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10
Q
  1. Carbon has the ability to bond strongly to itself and can form either straight, branched or ring type carbon compounds.

a. True
b. False

A

a. True

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11
Q
  1. Generally, the boiling point of a hydrocarbon compound will _______________________.

a. decrease with increased carbon chain length and increase with increased branching
b. decrease with increased carbon chain length and decrease with increased branching
c. increase with increased carbon chain length and increase with increased branching
d. increase with increased carbon chain length and decrease with increased branching

A

c. increase with increased carbon chain length and increase with increased branching

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12
Q
  1. Benzene is the basic building block for aromatic hydrocarbons which are a special class of unsaturated hydrocarbons with a ______________________.

a. cyclic molecular structure
b. straight chain molecular structure
c. branched chain molecular structure
d. straight chain molecular structure with one branch attached

A

a. cyclic molecular structure

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13
Q
  1. Coagulation is both a physical and chemical process that reduces turbidity and colour in water by?

a. Causing a chemical reaction in the water that traps the sediment at the surface of the water so it can be skimmed off readily.
b. Dissolving the sediment into very fine particles that are too small to cause problems.
c. Causing the fine sediment particles to combine into larger masses that settle rapidly to the bottom of a tank or settling pond.
d. Causing the fine sediment particles to combine into larger particles that will float on top the water so it can be skimmed off readily.

A

c. Causing the fine sediment particles to combine into larger masses that settle rapidly to the bottom of a tank or settling pond.

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14
Q
  1. 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

A

b. False

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15
Q
  1. 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

a. Glass like deposits on the turbine blades reducing efficiencies and increasing the potential for blade failures.

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16
Q
  1. 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.

A

c. The destruction of a metal by chemical or electrochemical reaction with its environment.

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17
Q
  1. 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.

A

c. Rearranging the carbon and hydrogen molecular structures to give the desired end products.

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18
Q
  1. 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

a. Sodium hydroxide, sodium sulphide and water.

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19
Q
  1. 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. 1, 2

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20
Q
  1. 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

a. Chemical formula = C4 H10 , structure =

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21
Q
  1. 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

A

d. equal numbers of atoms must appear on both sides

22
Q
  1. The compound of carbon, responsible for corrosion difficulties in a power plant is:

a. Graphite
b. Carbon dioxide
c. Charcoal
d. Carbon

A

b. Carbon dioxide

23
Q
  1. 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

A

e. will not return to its original shape after being deformed

24
Q
  1. 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

a. the body to return to its original shape after being deformed

25
Q
  1. Malleability property of material is that property which allows:

a. The material to be twisted a very large amount before breaking.
b. The material to be rolled to a desired shape without breaking.
c. The material to resist change in shape under an applied load.
d. The material to be heated to liquid state and poured into a mould.
e. The material to be lengthen without breaking.

A

b. The material to be rolled to a desired shape without breaking.

26
Q
  1. Hardness property of material is a body’s ability to ____________________.

a. absorb impact
b. resist penetration
c. resist bending
d. absorb heat
e. resist breaking

A

b. resist penetration

27
Q
  1. An example of a material with the mechanical property of brittleness is _______________.

a. carbon tool steel
b. cast iron
c. babbit
d. copper
e. lead

A

b. cast iron

28
Q
  1. The malleability of most materials will _________ when the material is heated.

a. stay the same
b. decrease
c. increase
d. most materials are not malleable
e. disappear

A

c. increase

29
Q
  1. The mechanical property that determines whether a material will break or stand up under a sudden impact or hard blow is:

a. Malleability
b. Plasticity
c. Ductility
d. Brittleness
e. Toughness

A

e. Toughness

30
Q
  1. Materials which break rather than bend, even though great force is required to break them, are said to be __________.

a. hard
b. brittle
c. malleable
d. tough
e. ductile

A

b. brittle

31
Q
  1. A material is said to possess ____________if it is very soft and easily deformed.

a. plasticity
b. hardness
c. ductility
d. brittleness
e. elasticity

A

a. plasticity

32
Q
  1. _________ is that property of a material, which enables it to be deformed under tension or stretched without rupture.

a. Hardness
b. Brittleness
c. Toughness
d. Ductility
e. Malleability

A

d. Ductility

33
Q
  1. __________ refers to that property of a material which enables it to resist wear, abrasion and penetration.

a. Brittleness
b. Stiffness
c. Hardness
d. Toughness
e. Elasticity

A

c. Hardness

34
Q
  1. The material property of toughness can be tested by:
1.     Drop test
2.     Charpy test
3.     Izod test
4.     Brinell test

a. 1, 2
b. 1, 3
c. 2, 4
d. 3, 4
e. 2, 3

A

e. 2, 3

35
Q
  1. A material’s ability to withstand great deformation under high loads before rupturing is a measure of its __________.

a. toughness
b. ductility
c. ultimate strength
d. malleability
e. stiffness

A

b. ductility

36
Q
  1. A body’s ability to resist change in shape and size under an applied load is known as _________________.

a. stiffness
b. ductility
c. toughness
d. malleability
e. hardness

A

e. hardness

37
Q
  1. A material that will break suddenly without very much deformation occurring before fracture is called ________.

a. stiff
b. hard
c. brittle
d. ductile
e. stress

A

c. brittle

38
Q
  1. If a material does not have the property of ductility then it will be _____________.

a. tough
b. hard
c. malleable
d. brittle
e. plastic

A

d. brittle

39
Q
  1. Examples of materials that have the mechanical property of hardness are:
1.     Stellite
2.     Babbit
3.     Carbon tool steel
4.     Diamond

a. 1, 2
b. 1, 3, 4
c. 2, 3, 4
d. 1, 2, 3
e. 1, 2, 3, 4

A

b. 1, 3, 4

40
Q
  1. If a material is said to have a high Brinell number, this means the material is _________________.

a. very hard
b. very tough
c. not very hard
d. not very tough
e. very brittle

A

a. very hard

41
Q
  1. Two common tests used to determine the toughness of a material are the Charpy and _____________ tests.

a. Rockwell
b. Brinnell
c. Izod
d. Shore scleroscope
e. Notcher

A

a. Rockwell

42
Q
  1. The ultimate strength of a material is determined by a test known as the tensile test.

a. True
b. False

A

a. True

43
Q
  1. A tensile test is performed by subjecting the specimen to a/an ______________.

a. Charpy test
b. Izod test
c. Brinell test
d. Stretching type load
e. Compactor

A

d. Stretching type load

44
Q
  1. A material that has the mechanical property “toughness” can be tested for this by which of the following tests:
1.     Drop test
2.     Charpy test
3.     Izod test
4.     Brinell test

a. 1, 2
b. 1, 3
c. 2, 3
d. 1, 3, 4
e. 2, 3, 4

A

c. 2, 3

45
Q
  1. Cast iron is produced, by melting pig iron together with ___________.

a. limestone
b. scrap iron
c. wrought iron
d. steel
e. coke

A

a. limestone

46
Q
  1. Iron is produced in a blast furnace from _____________.

a. steel ore
b. pig iron
c. iron ore
d. cast iron
e. wrought iron

A

b. pig iron

47
Q
  1. Cast iron has a certain percentage of carbon present. This percentage is __________.

a. 1-3%
b. 2-3%
c. 2-4%
d. 3-5%
e. 4-6%

A

c. 2-4%

48
Q
  1. The most important property a metal must posses to be used in the construction of a spring is ___________.

a. malleability
b. hardness
c. toughness
d. elasticity

A

d. elasticity

49
Q
  1. White metal used for slow speed and heavy load applications is composed of _____________.

a. 5% tin, 15% antimony and 80% lead
b. 5% tin, 20% antimony and 75% lead
c. 10% tin, 15% antimony and 75% lead
d. 15% tin, 10% antimony and 75% lead
e. 20% tin, 5% antimony and 75% lead

A

c. 10% tin, 15% antimony and 75% lead

50
Q
  1. Of all the materials listed below, the one which the property of brittleness is the highest is ______________.

a. aluminum
b. cast iron
c. babbit
d. copper

A

b. cast iron

3A1 (12 decks)

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