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Flashcards in Electronics Information Deck (57)
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31

This is the circuit symbol for a _____
a) Lamp
b) Transistor
c) Connected wires
d) Potentiometer

a) Lamp

32

In a closed electrical circuit current flows from
a) Low to high amps
b) High to low resistance
c) Positive to negative potentials
d) Negative to positive potentials

c) Positive to negative potentials

33

What is the voltage of most household electrical systems?
a) 60Hz
b) 60V
c) 220Hz
d) 110V

d) 110V

34

A rectifier
a) Is used to multiply the voltage in a circuit
b) Is another name for a variable resistor
c) Converts AC current to DC current
d) Converts DC current to AC current

c) Converts AC current to DC current

35

A capacitor to an electronic circuit is like a ____ to a house?
a) Driveway
b) Storage shed
c) Yard
d) Safe

b) Storage shed

36

A transistor to an electronic circuit is like a ____ to a house?
a) Driveway
b) Gate
c) Safe
d) Fence

b) Gate

37

Which of the following is a characteristic of direct current (DC)?
a) An example power source is a generator
b) An example power source is a battery
c) High voltage can produce low current
d) Electron flow periodically reverses direction

b) An example power source is a battery

38

Which of the following is not a purpose of a resistor in an electrical circuit?
a) Randomize the current in the circuit
b) Moderate the heat in the circuit
c) Control the voltage in the circuit
d) Limit the current in the circuit

a) Randomize the current in the circuit

39

What device is used to convert DC current to AC current?
a) Transformer
b) Regulator
c) Power inverter
d) Capacitor

c) Power inverter

40

How would you connect 4 [15V 25A] batteries to achieve a combined power output of 60V 25A?
a) Series parallel
b) Parallel series
c) Parallel
d) Series

d) Series

41

Which of the following statements about electrical resistance is false?
a) The more resistive the conductor is the faster electron flow will be
b) The more resistive the conductor is the slower electron flow will be
c) The less resistive the conductor is the faster electron flow will be
d) All materials have some resistive properties

a) The more resistive the conductor is the faster electron flow will be

42

What is the potential difference in an electrical circuit a measure of?
a) The load at a specific location in the circuit
b) The current at a specific location in the circuit
c) The resistance location in the circuit
d) The voltage at a specific location in the circuit

d) The voltage at a specific location in the circuit

43

Which of the following is the correct formula for Ohm’s Law?
a) V= R^2I
b) V= I x R
c) V= I/R
d) V= sqrt(RI)

b) V= I x R

44

Regarding magnets, what is the opposition that a substance offers to magnetic lines?
a) Permeability
b) Reluctance
c) Magnetic flux
d) Retentivity

b) Reluctance

45

An engineer who wants to document an electric circuit would create which of the following?
a) A schematic
b) A grid
c) A matrix
d) A diagram

a) A schematic

46

Which of the following is not a terminal on a transistor?
a) Emitter
b) Base
c) Collector
d) Input

d) Input

47

Capacitors connected in series produce _____ capacitance compared to capacitors connected in parallel.
a) Double
b) More
c) The same
d) Less

d) Less

48

This is the circuit symbol for a ______
a) Connected wires
b) Capacitor
c) Transistor
d) Battery

d) Battery

49

Suppose you have 10[12V 15A] batteries that you can connect together in series, in parallel, or in series-parallel. Which of the following voltage and ampere combinations cannot be attained using these 10 batteries?
a) 60V 300A
b) 60V 75A
c) 120V 75A
d) 12V 150A

a) 60V 300A

50

In an electronic circuit, a thermocouple is used to”
a) Provide an emergency ‘off’ switch for the circuit
b) Increase or decrease the temperature of a component in the circuit
c) Connect the circuit to ground
d) Open or close a circuit at a designated temperature

d) Open or close a circuit at a designated temperature

51

You would measure the amount of resistance at a certain point in a circuit with a/an
a) Thermometer
b) Battery
c) Voltmeter
d) Ohmmeter

d) Ohmmeter

52

Electricity cannot flow …
a) Through a circuit with resistance
b) Through a closed circuit
c) Through a circuit under load
d) Through an open circuit

d) Through an open circuit

53

Regarding magnet, what is the degree to which a substance remains magnetized after the magnetizing force is removed?
a) Magnetic flux
b) Permeability
c) Reluctance
d) Retentivity

d) Retentivity

54

Current in an electric circuit creates heat because:
a) Heat is created when the current overcomes resistance in the wire
b) Current is naturally hot
c) Voltage is naturally hot
d) Heat is created when the current overcomes voltage in the wire

a) Heat is created when the current overcomes resistance in the wire

55

This is the circuit symbol for a ______
a) Connected wires
b) Diode
c) Potentionmeter
d) Switch

b) Diode

56

Electromotive force is another name for:
a) Ac current
b) Resistance
c) Voltage
d) Heat

c) Voltage

57

Which of the following is not an advantage of semiconductors over conductors?
a) Materials to produce semiconductors are cheap and abundant
b) A semiconductor exhibits increased conductivity with increased temperatures
c) A semiconductor’s conductivity can be varied under an external electrical field
d) A semiconductor conducts current better than a conductor

d) A semiconductor conducts current better than a conductor