MODULE 3 CHAPTER 2 QUIZ 1

02. Static Electricity and Conduction.

Question Number. 1. A semi-conductor will have.

Option A. two electrons in the outer shell

. Option B. four electrons in the outer shell.

 Option C. eight electrons in the outer shell.

Correct Answer is. four electrons in the outer shell. Explanation. NIL.

Question Number. 2. Ion current is found in.

Option A. conductors and semi-conductors.

 Option B. liquids and gasses.

 Option C. semi-conductors.

 Correct Answer is. liquids and gasses. Explanation. NIL.

Question Number. 3. Electricity conducts through.

 Option A. vacuum.

Option B. solids and liquids only.

Option C. solids only.

Correct Answer is. solids and liquids only. Explanation. Electricity can conduct through a vacuum by thermionic emmission.

Question Number. 4. An example of a good electrical insulator is.

Option A. aluminium.

 Option B. glass.

Option C. mercury. Correct Answer is. glass. Explanation. You MUST know that surely!.

Question Number. 5. Static charges remaining in an aircraft are dissipated by.

 Option A. earthing the aircraft as soon as possible.

 Option B. the use of a conducting type nose wheel.

Option C. bonding the aircraft to a refuel tanker.

Correct Answer is. the use of a conducting type nose wheel. Explanation. Usually, the nose wheel tyre contains graphite, to dissipate the static electricity on landing ..................................

Question Number. 6. An element could be considered to be a conductor if it has.

Option A. a small number of electrons in its outer orbit.

 Option B. a large number of electrons in its outer orbit.

Option C. a large number of electrons.

Correct Answer is. a small number of electrons in its outer orbit. Explanation. The lower the number of electrons in the outer shell, the more readily it will give them up ..................................

Question Number. 7. A charged body is said to have.

 Option A. a surplus or deficiency of electrons.

Option B. a deficiency of neutrons.

 Option C. a surplus of protons.

 Correct Answer is. a surplus or deficiency of electrons.

 Explanation. If it has a surplus of electrons it is negatively charged. A deficiency of electrons makes it positively charged ..................................

Question Number. 8. The risk of a fire due to static electricity is overcome.

 Option A. by connecting all metal components by bonding.

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

Option C. by fitting static wicks and insulating all metal components.

Correct Answer is. by connecting all metal components by bonding

. Explanation. NIL ..................................

Question Number. 9. The purpose of bonding is to.

 Option A. 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.

 Correct Answer is. stop different potentials developing with subsequent fire risks.

Explanation. NIL ..................................

Question Number. 10. The various parts of an aircraft airframe are maintained at the same potential by. Option A. the supply bus-bars.

Option B. bonding.

Option C. static discharge wicks

. Correct Answer is. bonding.

 Explanation. NIL ..................................