Multiple Choice Questions on

Understanding Corrosion

Questions 16 - 20

Page 4 of 4


16.

The two most common electrodes used for measurement of corrosion potentials are:

[  ]

Ag - AgCl

[  ]

Cu - CuSO4

[  ]

Hg - Hg2Cl2

[  ]

Hydrogen electrode


17.

The most common electrode used in cathodic protection measurement is

[  ]

calomel

[  ]

silver - silver chloride

[  ]

copper - copper sulphate

[  ]

hydrogen


18.

The emf series is

[  ]

a list of elements arranged according to their standard electrode potentials, the sign being positive for elements whose potentials are cathodic to hydrogen and negative for those anodic to hydrogen

[  ]

an orderly arrangement of potentials of metals and alloys in hydrogen

[  ]

an orderly arrangement of the electrode potentials of metals and alloys in a given environment

[  ]

an orderly arrangement of active metals with respect to the noble metals


19.

An active metal

[  ]

has a negative potential

[  ]

has a positive potential

[  ]

occupies a lower position in the emf series

[  ]

None of the above


20.

A galvanic series is

[  ]

a list of alloys arranged according to their corrosion potentials in a given environment

[  ]

a list of metals and alloys according to their corrosion potentials in a given environment

[  ]

a list of standard electrode potentials of alloys or metals arranged in order of their values

[  ]

a grouping of metals and alloys based on their ability to get oxidized in a stated environment