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Review For Board Exam > SET 2 ECT > Flashcards

SET 2 ECT Flashcards

1
Q

What is the basic unit of capacitance?

A

The farad

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2
Q

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

A

Inductor

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3
Q

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

A

413 V

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4
Q

What formula is used to calculate voltage in a circuit?

A

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

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5
Q

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

A

Voltage and resistance

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6
Q

How is an ammeter usually connected to a circuit?

A

In series with the circuit

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7
Q

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

A

15.4 Ω

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8
Q

What does the abbreviation “LED” stand for?

A

Light Emitting Diode

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9
Q

What formula is used to calculate resistance in a circuit?

A

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

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10
Q

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

A

Capacitance

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11
Q

Which of the following electronic components can amplify signals?

A

Transistor

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12
Q

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

A

Capacitor

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13
Q

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

A

1 volt

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14
Q

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

A

Schematic symbols

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15
Q

Which semiconductor component has a gate electrode?

A

Field effect transistor

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16
Q

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

A

10 volts

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17
Q

What is the basic unit of inductance?

A

The henry

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18
Q

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

A

1.5 amperes

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19
Q

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

A

Diode

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20
Q

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

A

The circuit contains a large capacitor

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21
Q

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

A

A voltmeter

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22
Q

Which of the following might damage a multimeter?

A

Attempting to measure voltage when using the resistance setting

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23
Q

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

A

Anode and cathode

24
Q

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

A

8 ohms

25
Q

What electrical parameter is controlled by a potentiometer?

A

Resistance

26
Q

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

A

2.1 kV

27
Q

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

A

Become four times as great.

28
Q

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

A

76 Ω

29
Q

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

A

Bipolar junction transistor

30
Q

Which semiconductor component has an emitter electrode?

A

Bipolar transistor

31
Q

What instrument is used to measure resistance?

A

An ohmmeter

32
Q

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

A

Fuse

33
Q

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

A

30 ohms

34
Q

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

A

Transistors

35
Q

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

A

Protons

36
Q

What does the abbreviation “FET” stand for?

A

Field Effect Transistor

37
Q

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

A

Gain

38
Q

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

A

7.3 mA

39
Q

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

A

15.91A

40
Q

Which instrument is used to measure electric current?

A

An ammeter

41
Q

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

A

Inductance

42
Q

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

A

Potentiometer

43
Q

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

A

In parallel with the circuit

44
Q

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

A

3 ohms

45
Q

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

A

Switch

46
Q

What electrical component stores energy in an electric field?

A

Capacitor

47
Q

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

A

10 amperes

48
Q

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

A

Inductor

49
Q

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

A

Transistor

50
Q

You can expect to find a wiring diagram

A

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

51
Q

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

A

Resistor

52
Q

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

A

2 amperes

53
Q

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

A

20 volts

54
Q

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

A

With a stripe

55
Q

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

A

Ensure that the circuit is not powered

Review For Board Exam (17 decks)

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