Basic Electricity

Question 1

1 kW is equal to how many watts?

Answer 1

1000 watts

Question 2

What is a common cause of damage to solid-state components and/or integrated circuits?

Answer 2

Electrostatic discharge from the human body during handling

Question 3

Describe magnetism

Answer 3

An object properties which attract metallic substances

Question 4

When the external magnetizing force is removed, what is the difference between permanent/temporary magnets?

Answer 4

Permanent magnets retain their magnetism, and temporary magnets rapidly lose their magnetism

Question 5

What makes up an electrical circuit?

Answer 5

Source of electrical energy, a resistance, and a conductor

Question 6

What law governs the basic study of electricity?

Answer 6

Ohms law

Question 7

What are the basic elements of ohms law?

Answer 7

E Dash voltage, R Dash resistance, I – current

Question 8

Which change occurs in a DC circuit when applied voltage is increased and resistance remains constant?

Answer 8

Current increases

Question 9

Ohms law expressed as an equation

Answer 9

E= IxR, R= E/I, I= E/R

Question 10

Scientifically, power is measured in

Answer 10

Watts

Question 11

Common methods electrical energy can be produced

Answer 11

Pressure, chemical, thermal, sunlight

Question 12

The law relevant to voltage law

Answer 12

Kirchhoff’s law

Question 13

Three types of DC electrical circuits

Answer 13

Series, parallel, and series/parallel (complex)

Question 14

Types of circuits aircraft mechanics encounter on aircraft?

Answer 14

A combination circuit, series-parallel

Question 15

Compare AC & DC circuits in aircraft

Answer 15

DC flows constantly in one direction. AC has ability to change direction at or during regular intervals, is lighter weight, and its voltage can be stepped up and down by using a transformer.

Question 16

How much voltage do most aircraft systems require for special equipment?

Answer 16

Most need 24 V, needs 400 Hz AC current

Question 17

You must apply a correction to the specific gravity that varies between what two values?

Answer 17

When the temperature is less than 70°F or more than 90°F

Question 18

The functions of a capacitor in an AC circuit

Answer 18

The store electricity

Question 19

How is capacitance represented in an AC circuit

Answer 19

Buy a capacitor

Question 20

How is inductance represented in an AC circuit

Answer 20

By a coil

Question 21

Describe inductance

Answer 21

Inducted voltage - which is opposite in direction to the applied voltage

Question 22

What properties of an AC circuit oppose any change in current?

Answer 22

Resistance, inductive reactance, and capacitive reactance

Question 23

Describe impedance in an AC circuit?

Answer 23

The components delay or slow down the AC current or voltage due to their internal resistance

Question 24

What is the common use of most multimeters?

Answer 24

Troubleshooting and measurement of voltage, resistance, current continuity, capacitance, and inductance

Question 25

Describe short circuit

Answer 25

Low resistance path between two poles

Question 26

Using a multimeter, how would a technician read current?

Answer 26

Inserting the ammeter or multimeter in series by opening or breaking the circuit. The positive side of the meter read is connected towards a positive voltage source and negative Jack to the black.

Question 27

Why would you not perform a specific gravity check of electrolyte NI-CAD battery?

Answer 27

Because the specific gravity does not change with the state of charge

Question 28

How many cells make up a lead acid battery rated at 24 Volts?

Answer 28

12 cells

Question 29

When reading a specific gravity of a fully charged lead acid battery, what indicates the high state of charge?

Answer 29

Specific of gravity of the battery liquid between 1.275 and 1.310

Question 30

What is considered to be the open circuit voltage of a fully charged 12 cell lead acid battery?

Answer 30

Approximately 26.4 Volts or 12×2.2 Volts which equals 28 Volts are required for charging.

Question 31

What is the open circuit cell voltage of a NiCad battery?

Answer 31

1.25 Volts

Question 32

What is a hazard when storing NiCad batteries and lead acid batteries in the same area?

Answer 32

The fumes from one type can contaminate the electrolyte and the other type

Question 33

Can NiCad batteries be interchangeable with lead acid types?

Answer 33

Yes

Question 34

How does a capacitor store electricity?

Answer 34

In the form of a electrostatic charge or field that exists between two conductors separated by an insulator

Question 35

What should be done when interchanging a NiCad battery with a lead battery?

Answer 35

Clean, dry and neutralize with boric acid or ammonia, then completely air/oven dried

Question 36

What is a probable cause when troubleshooting the NiCad battery for failing to deliver it’s rated capacity?

Answer 36

Faulty cells or cell imbalance