Electricity 6 Of 7

Question 1

The battery is the most important power source in use because?

Answer 1

It’s energy is self-contained

Question 2

The battery is used mostly wherever a ___________ Power source is required.

Answer 2

Portable

Question 3

The battery is also used as a _________ source of voltage in a voltage standard.

Answer 3

Calibrated

Question 4

What are the two classes of battery’s?

Answer 4

Primary and secondary.

Question 5

The __________ battery converts chemical energy into electrical energy directly, using the chemical materials within the cell to start the action.

Answer 5

Primary

Question 6

The _________ battery must first be charged before it can convert chemical energy into electrical energy.

Answer 6

Secondary

Question 7

The secondary battery is frequently called?

Answer 7

A storage battery.

Question 8

The ______ is the basic unit of the battery.

Answer 8

Cell

Question 9

The ______ battery is used when limited current is required and the _________ battery is used when a heavy current is required.

Answer 9

Primary,

Secondary

Question 10

The metals in a cell are called?

Answer 10

Electrodes

Question 11

The amount of chemical activity that the electrolyte causes and the type of metal used for the electrodes will help determine the__________ and __________ output of the cell

Answer 11

Voltage and current

Question 12

What is a disadvantage of the primary wet cell?

Answer 12

As the battery is used, the negative electrode disintegrates.

Question 13

The basic primary wet cell is usually called the __________.

Answer 13

Voltaic cell

Question 14

3, 1.5 volt batteries connected in series produces how much voltage?

Answer 14

4.5v

Question 15

How many voltage ratings do batteries have?

Answer 15

Two.
A no-load rating, and
A normal load rating

Question 16

What determines the useful life of a cell?

Answer 16

The amount of current flowing through a cell.

Question 17

A cell’s ratings and life depend on its _____________.

Answer 17

Internal resistance.

Question 18

Lead-acid batteries should never be overcharged because?

Answer 18

Overcharging causes explosive hydrogen and oxygen gases.

Question 19

When an electric charging current is applied to a lead-acid battery, one electrode turns into _____ and the other turns into ___________.

Answer 19

Spongy lead

Lead peroxide

Question 20

To reduce Sulfation, the lead-acid cell must be kept _________, and the electorate level must be kept at least 3/8 inch above the plates.

Answer 20

Charged.

Question 21

The state of charge can be determined by measuring the specific gravity of the electrolyte with a __________.

Answer 21

Hydrometer.

Question 22

The photoconductive cell is basically a variable resistive device that permits more current to flow in a circuit when it is struck by____________.

Answer 22

Light

Question 23

A photovoltaic cell uses dissimilar __________ materials and a thermoelectric cell used dissimilar metals.

Answer 23

Semiconductors

Question 24

A ________ generator uses heat and chemical activity to generate a charge.

Answer 24

Thermionic

Question 25

A generator produces electricity by the ____________ of a group of conductors in a magnetic field.

Answer 25

Rotation

Question 26

What are the two types of generators?

Answer 26

Ac, and | Dc generators

Question 27

When excitation current is produced from the generators own output, the generator is a _____________ generator.

Answer 27

Self-excited.

Question 28

Batteries are rated according to the amount of ________ they can supply in a given amount of time.

Answer 28

Current

Question 29

A simple dc generator consist of 4 basic parts. What are they?

Answer 29

1) a magnetic field 2) a conductor, in the form of a loop 3) a commutator 4) and brushes

Question 30

The magnetic field of a generator can be produced by what two things?

Answer 30

A magnet or electromagnet

Question 31

Armature reaction and self-induction of the armature coils tend to shift the position of the _________.

Answer 31

Neutral plane

Question 32

Interpoles are connected in ___________ with the armature winding to oppose the magnetic field of the armature winding.

Answer 32

Series

Question 33

In many generators, the brushes are electrically connected to the brush holders by braided copper wires called ___________.

Answer 33

Pigtails

Question 34

The simplest ac generator consists of?

Answer 34

A magnetic field and a single rotating loop.

Question 35

In an ac generator, the ends of the loop are some way connected directly to__________ instead of a commutator like the dc generator.

Answer 35

The brushes

Question 36

How many degrees apart are the voltages of a three phase generator?

Answer 36

120 degrees

Question 37

The wye connection gives an increase in ____________ but not __________

Answer 37

Voltage | Current

Question 38

The delta connection increases ________ but not _________.

Answer 38

Current | Voltage

Question 39

``` Control bus batteries are used to supply electrical power to: A) operate oil circuit breakers B) emergency pumps C) emergency lighting systems D) all of the above ```

Answer 39

D

Question 40

The dry cell battery is a?

Answer 40

Primary cell

Question 41

What is the main difference between a primary and secondary battery?

Answer 41

A primary battery cannot be charged while a secondary battery can.

Question 42

Polarization is due to the neutral gas bubbles that collect around the?

Answer 42

positive electrode

Question 43

A battery being charged begins to gas freely. The current should be?

Answer 43

Decreased

Question 44

The number of negative plates in a lead-acid cell is?

Answer 44

Always 1 more than the number of positive plates.