AS113-4 Course Review

Question 1

What is a battery?

Answer 1

A Device that convert chemical energy into electrical Energy

Question 2

Name the two types of cells of a battery.

Answer 2

Primary cell Dry
Secondary cell Wet

Question 3

What would the hydrometer reading be for a fully charge lead-acid battery? __________

Answer 3

1.275 or 1.3

Question 4

During an installation of a battery into an aircraft, when should the negative terminal be connected?

Answer 4

Second after the positive lead

Question 5

What is “deep cycling” or equalization of a battery?

Answer 5

Continue to discharge the battery but at a slower rate

When cells voltage gets to .2VDC per cell, short the cells with shorting strips

Leave straps on 3 to 8 hours

Question 6

What will a measured discharge test tell the mechanic?

Answer 6

The state of the battery

Capacity of a Nickel Cadmium Battery

Question 7

How do you check the state of charge for a lead-acid battery? _________________

Answer 7

Hydrometer

Question 8

What happens to the electrolyte in a lead acid battery during discharge?

Answer 8

Dilutes

Question 9

What is used to check specific gravity of a lead acid battery?

Answer 9

Hydrometer

Question 10

How many volts per cell are in a NiCad battery?

Answer 10

1.5 to 1.8

Question 11

How many volts per cell are in a lead acid battery?

Answer 11

2.1

Question 12

What are two ratings found on aircraft batteries?

Answer 12

Voltage
Ampere Hour capacity rating

Question 13

What is used to neutralize a NiCad battery’s electrolyte?

Answer 13

Boric Acid and Vinegar

Question 14

What is used to neutralize a lead acid battery’s electrolyte?

Answer 14

Sodium Bicarbonate

Question 15

If batteries are connected in parallel with each other, what increases?

Answer 15

Amps / Capacity

Question 16

What is one complete sequence from zero to positive peak to zero, then to negative peak and back to zero?

Answer 16

Cycle

Question 17

What is the definition of frequency?

Answer 17

of cycles in 1 sec, measured in Hz

Question 18

What is another name for RMS Value?

Answer 18

Effective Value

Question 19

What is the power factor of a purely resistive circuit?

Answer 19

1

Question 20

What is the phase angle when current and voltage are in phase?

Answer 20

0

Question 21

What is the power factor when current and voltage are in phase?

Answer 21

1

Question 22

What is the power factor of a purely capacitive circuit?

Answer 22

0

Question 23

What value does a meter read when measuring AC?

Answer 23

RMS

Question 24

In an AC circuit, effective value is always (greater or less) than peak?

Answer 24

Less

Question 25

True power will never be (greater or less) than apparent power?

Answer 25

Greater

Question 26

Looking at the frequency formula, what factors affect output frequency? _

Answer 26

of poles and RPM

Question 27

An inductor is defined as:

Answer 27

A coil of wire.
Changes the values of alternating current and voltage

Question 28

What letter is used to represent inductance?

Answer 28

L

Question 29

What four factors affect the inductance of a coil?

Answer 29

Type of core

Size of wire

Number windings

Spacing and shape in coil

Question 30

Inductive reactance is defined as:

Answer 30

The opposition to AC current flow that is caused by the presence of an inductor in the circuit

Question 31

What does current do with respect to voltage in an inductive circuit?

Answer 31

Lags

Question 32

What happens to inductive reactance if frequency is increased?

Answer 32

increases

Question 33

Transformers work off of what electrical principle?

Answer 33

Mutual Inductance

Question 34

If a transformer has a 10:1 turns ratio with an input of 28 volts and 1 amp, what will the output be?

Answer 34

2.8 V, 10 Amps

Question 35

What type of transformer is in the question above?

Answer 35

Step Down

Question 36

A capacitor is defined as:

Answer 36

A device used to store electrical energy in the form of electro static fields.

A capacitor is essentially two conductors separated by an insulator

Question 37

How does a capacitor store electrical energy?

Answer 37

Electrostatic Fields

Question 39

What letter is used to represent capacitance?

Answer 39

C

Question 40

What three factors affect the capacitance of a capacitor?

Answer 40

Area of plates
Separation between plates
Composition of dielectric

Question 41

What are two ratings found on capacitors?

Answer 41

Capacitance
Voltage

Question 42

What does the working voltage of a capacitor have to be compared to the applied voltage?

Answer 42

50% higher than the highest voltage

Question 43

What dielectric does a self healing capacitor have?

Answer 43

Oil

Question 44

Capacitive reactance is defined as:

Answer 44

Opposition offered by a capacitor to the flow of alternating current though it

Question 45

What does current do with respect to voltage in a capacitive circuit?

Answer 45

Leads

Question 46

What happens to capacitive reactance if frequency is increased?

Answer 46

Decreases

Question 47

Impedance is defined as:

Answer 47

measure of the opposition to electricity flow

Question 48

What is the name of a device that changes AC into DC?

Answer 48

Rectifier

Question 49

What happens when a capacitor is placed into a rectifier circuit?

Answer 49

Smooths out the voltage

Question 50

Resonant frequency is defined as:

Answer 50

Frequency at which the inductive and capacitive reactance are the same