EASA DGCA Module 3.2Static Electricity and Conduction(1of3)

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Sub-Module 02 - LEVEL-2 Static Electricity and Conduction Static electricity and distribution of electrostatic charges; Electrostatic laws of attraction and repulsion; Units of charge, Coulomb's Law; Conduction of electricity in solids, liquids, gases and a vacuum.

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How is static electricity usually generated?
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1 point

By rubbing non-conductive materials together

By heating conductive materials

By cooling non-conductive materials

Static charges remaining in an aircraft are dissipated by.

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earthing the aircraft as soon as possible.

the use of a conducting type nose wheel.

bonding the aircraft to a refuel tanker.

Ion current is found in

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conductors and semi-conductors.

liquids and gasses.

semi-conductors.

The risk of a fire due to static electricity is overcome.

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by connecting all metal components by bonding.

by fitting static wicks and isolating the battery from inflammable gas sources.

by fitting static wicks and insulating all metal components.

What differentiates static electricity from dynamic electricity?
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Static electricity has current flowing

Dynamic electricity is caused by friction

Static electricity involves electrons at rest

The purpose of bonding is to.

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ensure all components have been securely fitted.

Option B. stop different potentials developing with subsequent fire risks.

Option C. give generated static an easy return path to the generator.

A charged body is said to have.

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a surplus or deficiency of electrons.

a deficiency of neutrons.

a surplus of protons

If a negatively charged conductor is placed next to an insulated rod.

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the rod becomes negatively charged.

the rod has no charge.

the rod becomes positively charged.

How does a positively charged rod affect a nearby uncharged metal bar by induction?
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It attracts electrons to the end closest to the rod

It repels electrons from the end closest to the rod

It neutralizes the bar without any electron movement

The resistance of the current return path through the aircraft is always considered negligible, provided the.

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structure is adequately bonded.

voltage drop across the circuit is checked.

generator is properly grounded.

What is one of the most frequent causes of damage to solid-state components?
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Electrostatic discharge from the human body

Excessive voltage

Physical impact

What determines the direction of an electrostatic field?
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It always points towards a positive charge

It is indicated by the number of lines per unit area

It points in the direction a positive test charge would move

How can a charged rod influence an uncharged metal bar by contact?
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It can transfer electrons to or from the metal bar

It can neutralize the charge without contact

It can only influence the bar if they are both conductors

What happens to the charge distribution on an irregularly shaped object?
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It becomes evenly distributed

It concentrates on the flat surfaces

It concentrates at the points or sharpest curvatures

A semi-conductor will have.

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two electrons in the outer shell.

eight electrons in the outer shell.

four electrons in the outer shell.

According to Coulomb's law, what is the relationship between force and distance between charges?
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Force increases with distance

Force is inversely proportional to the square of the distance

Force is directly proportional to the square of the distance

What unit measures electrical charge?
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Ampere

Volt

Coulomb

If an insulated conductor is placed near to a negatively charged rod,the nearest end of the conductor becomes.

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No change will occur.

negatively charged.

positively charged.

The electromagnetic force between two charged bodies is.

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inversely proportional to the distance between them.

inversely proportional to the square of the distance between them.

proportional to the distance between them.

The various parts of an aircraft airframe are maintained at the same potential by.

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the supply bus-bars.

bonding.

static discharge wicks.

Electricity conducts through

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vacuum.

solids and liquids only.

solids only.

An element could be considered to be a conductor if it has.

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a small number of electrons in its outer orbit.

a large number of electrons in its outer orbit.

a large number of electrons.

How is the charge distributed on a uniformly shaped metal object?
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Evenly over the entire surface

Only on the outer edges

Concentrated at the center

What happens when two objects have an imbalance of charges?
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They neither attract nor repel each other

They exhibit an attractive or repulsive force

They become neutral

An example of a good electrical insulator is.

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aluminium.

glass.

mercury.

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