PHEP Chapter 6

Question 1

Why is a battery the most important power source?

Answer 1

Self contained, portable

Question 2

What are the classifications of a battery

Answer 2

Primary or secondary

Question 3

Which class is a storage battery?

Answer 3

Secondary

Question 4

What are the metal plates in a call called?

Answer 4

Electrodes

Question 5

What creates polarization in a battery?

Answer 5

Neutral gas bubbles collecting around positive electrode

Question 6

What will help to determine voltage and current output in a cell?

Answer 6

Chemical activity of electrolyte

Question 7

What is the basic unit of a battery

Answer 7

A cell

Question 8

What makes up a cell?

Answer 8

Electrodes made of different metals, electrolyte

Question 9

What are the two voltage ratings of a battery?

Answer 9

No-load, normal-load

Question 10

What type of battery should never be overcharged?

Answer 10

Lead acid

Question 11

How can the state of charge be determined ?

Answer 11

Measuring specific gravity with hydrometer

Question 12

What uses heat and chemical activity to generate a charge?

Answer 12

Thermionic generator

Question 13

How does a generator produce electricity?

Answer 13

Rotation of a group of conductors in a magnetic field

Question 14

When is an EMF induced in a conductor?

Answer 14

When the conductor cuts the lines of magnetic flux

Question 15

Which direction do electrons flow?

Answer 15

Negative to positive

Question 16

What does a commutator do?

Answer 16

Converts AC into DC

Question 17

What are the two types of generators?

Answer 17

AC and DC

Question 18

The current that excites the field winding of a dc generator must be …?

Answer 18

DC

Question 19

When is the excitation current supplied by a generators own output

Answer 19

Self excited generator

Question 20

What are compensating windings?

Answer 20

Small series windings set in the main pole pieces

Question 21

why does the neutral plane tend to shift when a generator is running

Answer 21

a result of armature reaction and self induction in the coils

Question 22

what are pigtails

Answer 22

braided copper wire used to connect brushes to brush holders

Question 23

what produces three equal voltage is 120 degrees out of phase

Answer 23

a 3-phase generator

Question 24

in a Delta connection what are the relationship between line voltage and phase voltage?

Answer 24

equal

Question 25

in a Delta connection how many times greater is line current than phase current

Answer 25

1.73

Question 26

what type of connection gives an increase in voltage but not in current

Answer 26

wye connection

Question 27

What coverts low DC voltage to high DC voltage

Answer 27

dynamotor