EASA Module 3 Electrical Fundamentals

Module3 electrical fundamentals from lpapadop

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SAFETY AND CONTROL DEVICES Switches, types of switches

SAFETY AND CONTROL DEVICES 

A switch is used to start, stop or change the direction of the current in a circuit These are used to control current in electrical circuits

Switches

Most of them are meant to operate at certain times under certain conditions to perform very definite functions

 

LIGHTS on Airplanes explained by "CAPTAIN"Joe :-

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SAFETY AND CONTROL DEVICES ,Fuses And Circuit Breaker

Safety Devices

To protect electrical system from damage and failure caused by excessive current, several kinds of protective devices are installed in the systems.

Circuit Breaker

It is a device which breaks the circuit and stops the current flow whenever the current exceeds a predetermined value.

 

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M3 Electrical Fundamentals Sub-Module No 11 (Quiz No:1)

Inductance

Quiz

 

1. The primary aspect of the operation of a coil is its property to oppose any change in current through it. This property is called-----------------?
   1.   Transister
   2.   Capacitance
   3.   Inductance
2. If more turns are used on the coil, meter deflection is------------------ and is proportional to the number of turns (n) ?
   1.   Less
   2.   Greater
   3.   Constant
3. It opposes the rate of change of current flowing through it due to the build up of self-induced energy within its magnetic field ?
   1.   Saturation current
   2.   Inductor
   3.   Capacitance
4. It is a qualitative law that specifies the direction of induced current but says nothing about its magnitude ?
   1.   Lenz's law
   2.   Electromagnetic induction
   3.   Faraday’s law
5. Eddy currents flow in closed loops within conductors, in planes------------------- to the magnetic field ?
   1.   Horizontal
   2.   Perpendicular
   3.   Longitudinal
6. They are also used in electronic filters to separate signals of different frequencies ?
   1.   Transister
   2.   Resistors
   3.   Inductors
7. They are used to block ac while allowing dc to pass, designed for this purpose are called ---------------?
   1.   Transister
   2.   Chokes
   3.   Capacitor
8. The permeability of ferromagnetic materials is------------------, but depends on h ?
   1.   Not Constant
   2.   Constant
   3.   Decreases
9. Eddy currents are also called ------------------?
   1.   Foucault currents
   2.   Saturation current
   3.   Self-induction
10. It is also called a choke ?
    1.   Capacitance
    2.   Transister
    3.   Inductor

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M3 Electrical Fundamentals Sub-Module No 5 (Quiz No:1)

Magnetism

Quiz

 

1. Heating or sudden shock will cause misalignment of the molecules, causing the strength of a magnet ?
   1.   Increase
   2.   Decrease
   3.   No effect
2. Where no more lines of force can be induced or introduced, the material is then said to be ?
   1.   Non magnetic
   2.   Charged
   3.   Saturated
3. Any substance, such as bismuth, having a permeability of less than one, is considered ?
   1.   Paramagnetic
   2.   Diamagnetic
   3.   Ferromagnetic
4. Measure of opposition to the lines of force through a material, can be compared to the resistance of an electrical circuit ?
   1.   Reluctance
   2.   Inductance
   3.   Capacitance
5. Reluctance of soft iron, for instance, is……...Than that of air ?
   1.   Much lower
   2.   Higher
   3.   Equal
6. Nonferrous metals with a permeability greater than one, such as nickel and cobalt, are called ?
   1.   Diamagnetic
   2.   Para magnetic
   3.   Ferromagnetic
7. Ability of a magnet to hold its magnetism varies greatly with the type of metal and is known as ?
   1.   Resistivity
   2.   Retentively
   3.   Capacitance
8. When a wire contains many loops, it is called a ?
   1.   Wire
   2.   Cable
   3.   Coil
9. Standard unit of magnetomotive force is the ?
   1.   Ampere-turn (at)
   2.   Volt-turn (VT)
   3.   Voltage
10. Gilbert is defined differently, and is a…...Unit than the ampere-turn ?
    1.   Slightly higher
    2.   Very small
    3.   Slightly smaller

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