SET 2 ECT

Question 1

What is the basic unit of capacitance?

Answer 1

The farad

Question 2

What type of electrical component stores energy in a magnetic field?

Answer 2

Inductor

Question 3

Suppose the resistance is 472 Ω, and the current is 875 mA. Thesource voltage must therefore be

Answer 3

413 V

Question 4

What formula is used to calculate voltage in a circuit?

Answer 4

Voltage (E) equals current (I) multiplied by resistance (R)

Question 5

Which of the following measurements are commonly made using a multimeter?

Answer 5

Voltage and resistance

Question 6

How is an ammeter usually connected to a circuit?

Answer 6

In series with the circuit

Question 7

A source delivers 12 V and the current is 777 mA. The bestexpression for the resistance is

Answer 7

15.4 Ω

Question 8

What does the abbreviation “LED” stand for?

Answer 8

Light Emitting Diode

Question 9

What formula is used to calculate resistance in a circuit?

Answer 9

Resistance (R) equals voltage (E) divided by current (I)

Question 10

What is the ability to store energy in an electric field called?

Answer 10

Capacitance

Question 11

Which of the following electronic components can amplify signals?

Answer 11

Transistor

Question 12

What type of electrical component consists of two or more conductive surfaces separated by an insulator?

Answer 12

Capacitor

Question 13

What is the voltage across a 2-ohmresistor if a current of 0.5 amperes flows through it?

Answer 13

1 volt

Question 14

What is the name for standardized representations of components in an electrical wiring diagram?

Answer 14

Schematic symbols

Question 15

Which semiconductor component has a gate electrode?

Answer 15

Field effect transistor

Question 16

What is the voltage across a 10-ohmresistor if a current of 1 ampere flows through it?

Answer 16

10 volts

Question 17

What is the basic unit of inductance?

Answer 17

The henry

Question 18

What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?

Answer 18

1.5 amperes

Question 19

What electronic component allows current to flow in only one direction?

Answer 19

Diode

Question 20

What is probably happening when an ohmmeter, connected across a circuit, initially indicates a low resistance and then shows increasing resistance with time?

Answer 20

The circuit contains a large capacitor

Question 21

Which instrument would you use to measure electric potential or electromotive force?

Answer 21

A voltmeter

Question 22

Which of the following might damage a multimeter?

Answer 22

Attempting to measure voltage when using the resistance setting

Question 23

What are the names of the two electrodes of a diode?

Answer 23

Anode and cathode

Question 24

What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes?

Answer 24

8 ohms

Question 25

What electrical parameter is controlled by a potentiometer?

Answer 25

Resistance

Question 26

Suppose the resistance is 473,332 Ω, and the current flowing through it is 4.4 mA. The best expression for the voltage of the source is

Answer 26

2.1 kV

Question 27

Suppose you double the voltage in a simple dc circuit, and cut the resistance in half. The current will

Answer 27

Become four times as great.

Question 28

Suppose the dc voltage is 550 mV and the current is 7.2 mA. Then the resistance is

Answer 28

76 Ω  

Question 29

Which of these components is made of three layers of semiconductor material?

Answer 29

Bipolar junction transistor

Question 30

Which semiconductor component has an emitter electrode?

Answer 30

Bipolar transistor

Question 31

What instrument is used to measure resistance?

Answer 31

An ohmmeter

Question 32

What electrical component is used to protect other circuit components from current overloads?

Answer 32

Fuse

Question 33

What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts?

Answer 33

30 ohms

Question 34

What class of electronic components is capable of using a voltage or current signal to control current flow?

Answer 34

Transistors

Question 35

An atom's atomic number is determined by the number of

Answer 35

Protons

Question 36

What does the abbreviation “FET” stand for?

Answer 36

Field Effect Transistor  

Question 37

What is the term that describes a transistor's ability to amplify a signal?

Answer 37

Gain

Question 38

Given a dc voltage source delivering 24 V and a resistance of 3.3 kΩ, what is the current?

Answer 38

7.3 mA

Question 39

Given a dc voltage source of 3.5 kV and a resistance of 220 Ω, what is the current?

Answer 39

15.91A  

Question 40

Which instrument is used to measure electric current?

Answer 40

An ammeter

Question 41

What is the ability to store energy in a magnetic field called?

Answer 41

Inductance

Question 42

What type of component is often used as an adjustable volume control?

Answer 42

Potentiometer

Question 43

What is the correct way to connect a voltmeter to a circuit?

Answer 43

In parallel with the circuit

Question 44

What is the resistance of a circuit that draws 4 amperes from a 12- volt source?

Answer 44

3 ohms

Question 45

What electrical component is used to connect or disconnect electrical circuits?

Answer 45

Switch

Question 46

What electrical component stores energy in an electric field?

Answer 46

Capacitor

Question 47

What is the current flowing through a 24-ohmresistor connected across 240 volts?

Answer 47

10 amperes

Question 48

What electrical component is usually composed of a coil of wire?

Answer 48

Inductor

Question 49

Which of these components can be used as an electronic switch or amplifier?

Answer 49

Transistor

Question 50

You can expect to find a wiring diagram

Answer 50

In the service/repair manual for a two-way radio.

Question 51

What electrical component is used to oppose the flow of current in a DC circuit?

Answer 51

Resistor

Question 52

What is the current flowing through a 100-ohmresistor connected across 200 volts?

Answer 52

2 amperes  

Question 53

What is the voltage across a 10-ohmresistor if a current of 2 amperes flows through it?

Answer 53

20 volts

Question 54

How is a semiconductor diode's cathode lead usually identified?

Answer 54

With a stripe

Question 55

Which of the following precautions should be taken when measuring circuit resistance with an ohmmeter?

Answer 55

Ensure that the circuit is not powered