Basic Electricity

Question 1

When charging current is applied to a nickel cadmium battery, the cells emit gas..

Answer 1

Toward the end of the charging cycle.

Question 2

What is the purpose of the ground symbol used in electrical circuit diagrams?

Answer 2

To show that there is a return path for the current.

Question 3

Transfer of electric energy from one circuit to another without the aid of electrical connections

Answer 3

is called induction.

Question 4

A thermal switch, or thermal protector, as used in an electric motor, is designed to

Answer 4

Open the circuit to allow cooling.

Question 5

What is commonly used as a rectifier in electrical circuits?

Answer 5

Diodes

Question 6

What describes the combined resistive forces in an AC circuit?

Answer 6

Impedance

Question 7

Typical application for zener diodes is as

Answer 7

a voltage regulator

Question 8

What may result if water is added to a nickel-cadmium battery when it is not fully charged?

Answer 8

Excessive spewing can occur while charging.

Question 9

A fully charged lead-acid battery will not freeze until extreme low temperatures are reached because..

Answer 9

most of the acid is in the solution.

Question 10

The potential difference between two conductors which are insulated from each other is measured in ….

Answer 10

Volts

Question 11

What factors strengthen a coil inductor?

Answer 11

Adding coils close together.

Question 12

What will a voltmeter read when properly connected across a closed circuit that is powered on?

Answer 12

0 voltage

Question 13

Foward biasing of a solid- state device will cause the device to

Answer 13

conduct

Question 14

In an AC circuit, the effective voltage is

Answer 14

less than the maximum instantaneous voltage.

Question 15

The basis for transformer operation in the use of alternating current is mutual

Answer 15

inductance

Question 16

What is the basic unit of electrical quantity?

Answer 16

Coulomb

Question 17

The presence of any small amount of potassium carbonate deposits on the top of nickel-cadmum battery cells in service is an indication of

Answer 17

normal operation

Question 18

The working voltage of a capacitor in an ac circuit should be

Answer 18

at least 50% greater than the highest applied voltage.

Question 19

What unit is used to express electrical power?

Answer 19

Watt

Question 20

Unless otherwise specified, any values given for current or voltage in an ac circuit are assumed to be

Answer 20

effective values

Question 21

What does the letter Q symbolize when measuring electrical charge?

Answer 21

Coulomb

Question 22

When referring to an electrical circuit diagram, what point is considered to be at zero voltage?

Answer 22

The ground reference

Question 23

The electrolyte of a nickel cadmium battery is highest when the battery is

Answer 23

in a fully charged condition

Question 24

In nickel-cadmium batteries, a rise in cell temperature

Answer 24

causes a decrease in internal resistance

Question 25

What is the opposition to the flow of ac produced by an electromagnetic field with generated back voltage called?

Answer 25

inductive reactance

Question 26

A condition of improperly torqued cell link connections on a nickel-cadmium battery

Answer 26

heat or burn marks of hardware

Question 26

A condition of improperly torqued cell link connections on a nickel-cadmium battery

Answer 26

heat or burn marks on hardware

Question 27

In a P-N-P transistor application, the solid-state device is turned on when the

Answer 27

base is negative with respect to the emitter

Question 28

What determines the amount of current which will flow through a battery while it is being charged by a constant voltage sourece

Answer 28

the state-of-charge of the battery

Question 29

How can the state-of-charge of a nickel-cadmium battery be determined?

Answer 29

By a measured discharge

Question 30

During discharge , nickel-cadmium batteries will show a lower liquid level than when at full charge because

Answer 30

the electrolyte becomes absorbed into the plates

Question 31

The method used to rapidly charge a nickel-cadmium battery utilizes

Answer 31

constant voltage with varying current

Question 32

The voltage drop in a circuit of known resistance is dependent on

Answer 32

the amperage of the circuit

Question 33

Electrostatic fields are also known as

Answer 33

dielectric fields

Question 34

what is the purpose of providing a space beneath lead-acid battery plates

Answer 34

to prevent sediment buildup from contacting the plates and causing a short circuit.

Question 35

When calculating power in a reactive circuit, the true power is

Answer 35

less than the apparent power

Question 36

capacitors are sometimes used in DC circuits to

Answer 36

smooth out slight pulsations in current/ voltage