Electricity 2

Question 1

What is a battery?

Answer 1

A device that converts chemical energy into electrical energy.

Question 2

Name the two types of cells of a battery?

Answer 2

Primary Cells

Secondary Cells

Question 3

What would the hydrometer reading be for a fully charged Lead Acid Battery?

Answer 3

1.275 - 1.300

Question 4

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

Answer 4

After the positive

Question 5

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

Answer 5

Removes the memory of a nicad battery

Question 6

What will a measured discharge test tell the mechanic?

Answer 6

State of Charge

Question 7

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

Answer 7

Measured Discharge Test

Question 8

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

Answer 8

More susceptible to freezing

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

Between 1.55 & 1.80

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 battery?

Answer 12

Voltage & Amp Hour Capacity

Question 13

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

Answer 13

Baking Soda & Water

Question 14

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

Answer 14

Bicarbonate / Baking Soda

Question 15

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

Answer 15

AMPS

Question 16

What three factors affect the capacitance of a capacitor?

Answer 16

The Size of the Conductor
The Size of the Gap Between Them
The Dielectric

Question 17

What letter is used to represent capacitance?

Answer 17

C

Question 18

How does a capacitor store electrical energy?

Answer 18

In the electric field between opposingly charged plates.

Question 19

Transformers work off of what electrical principle?

Answer 19

Electromagnetic Induction

Question 20

What happens to inductive reactance if frequency is increased?

Answer 20

Short Circuit

Question 21

Inductance = ?

Answer 21

Lags

Question 22

Capacitance = ?

Answer 22

Leads

Question 23

How many cells does a 12-Volt lead acid battery have if the cells are connected in series?

Answer 23

6

Question 24

What is the number of cycles per second in an AC circuit called?

Answer 24

Frequency

Question 25

Inductance opposes the change in current by the generation of what?

Answer 25

Counter Electromotive Force

Question 26

If you measure the voltage at an AC house hold outlet on your multi-meter you're reading what value?

Answer 26

Effective Value

Question 27

What is the power factor of a purely resistive AC circuit?

Answer 27

1

Question 28

What is the power factor of a purely inductive circuit?

Answer 28

0

Question 29

In an AC circuit the effective value for voltage is what?

Answer 29

Less than peak

Question 30

What 3 things must be present in order to have electromagnetic induction to occur in a generator?

Answer 30

Conductor, Magnetic Field, And Relative Motion between the two

Question 31

How many degrees out of phase are each phase in a 3-Phase generator?

Answer 31

120

Question 32

When you have different rated inductors connected in series, what would the total inductance be?

Answer 32

Equal to the sum of all inductors

Question 33

The opposition to the flow of alternating current caused by a coil is called what?

Answer 33

Inductive Reactance

Question 34

What frequency of alternating current is most commonly used on an aircraft?

Answer 34

400

Question 35

In an inductive circuit the current will either lead, lag, or equal the voltage?

Answer 35

Lags the Voltage

Question 36

What are not one of the two ways to connect a 3-phase generator? a) TRIAC b) Y c) Delta

Answer 36

TRIAC is not a way

Question 37

What happens to current in a set up transformer with a ratio of 1:8

Answer 37

Current is reduced 8 times

Question 38

You have different rated capacitors connected in series what would your total capacitance be?

Answer 38

Less than the capacitance of the lowest rated capacitor

Question 39

What should the working voltage rating of the capacitor installed in an AC circuit be?

Answer 39

50% greater than the highest applied voltage

Question 40

In a capacitance circuit the current will either lead, lag or equal?

Answer 40

Lead

Question 41

What effect does increase either frequency or capacitance have on a capacitive reactance?

Answer 41

Inversely Proportionate

Question 42

What type of capacitors can be safely installed in an AC circuit?

Answer 42

Non-Electrolytic

Question 43

Self-Healing capacitors during closed and metal containers filled with what?

Answer 43

Oil Dielectric

Question 44

What is the formula of times constant with the capacitor circuit?

Answer 44

R*C

Question 45

What does a diode block in an AC circuit?

Answer 45

Current

Question 46

What does a rectifier convert in a circuit?

Answer 46

AC to DC

Question 47

The term forward bias means that the diode is what?

Answer 47

Conducting current flow

Question 48

When calculating power in a reactive or inductive AC circuit the true power is?

Answer 48

Less than apparent power

Question 49

When a reactive effects of a capacitor and an inductor are equal the circuit is said to be what?

Answer 49

Resonate

Question 50

What is the total opposition to the flow of current in an AC circuit?

Answer 50

Impedance