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Canadian Amateur Radio Certificate - BASIC > 004 - Circuit Components > Flashcards

004 - Circuit Components Flashcards

1
Q

B-004-001-001
A circuit designed to increase the level of its input signal is called:

(a) a modulator
(b) an amplifier
(c) an oscillator
(d) a receiver

A

B-004-001-001
A circuit designed to increase the level of its input signal is called:

(b) an amplifier

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2
Q

B-004-001-002
If an amplifier becomes non-linear, the output signal would:

(a) become distorted
(b) be saturated
(c) cause oscillations
(d) overload the power supply

A

B-004-001-002
If an amplifier becomes non-linear, the output signal would:

(a) become distorted

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3
Q

B-004-001-003
To increase the level of very weak radio signals from an antenna, you would use:

(a) an RF oscillator
(b) an audio oscillator
(c) an audio amplifier
(d) an RF amplifier

A

B-004-001-003
To increase the level of very weak radio signals from an antenna, you would use:

(d) an RF amplifier

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4
Q

B-004-001-004
To increase the level of very weak signals from a microphone you would use:

(a) an RF oscillator
(b) an RF amplifier
(c) an audio oscillator
(d) an audio amplifier

A

B-004-001-004
To increase the level of very weak signals from a microphone you would use:

(d) an audio amplifier

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5
Q

B-004-001-005
The range of frequencies to be amplified by a speech amplifier is typically:

(a) 3 to 300 Hz
(b) 300 to 3000 Hz
(c) 300 to 1000 Hz
(d) 40 to 40 000 Hz

A

B-004-001-005
The range of frequencies to be amplified by a speech amplifier is typically:

(b) 300 to 3000 Hz

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6
Q

B-004-001-006
Which of the following is not amplified by an amplifier?

(a) Current
(b) Resistance
(c) Power
(d) Voltage

A

B-004-001-006
Which of the following is not amplified by an amplifier?

(b) Resistance

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7
Q

B-004-001-007
The increase in signal level by an amplifier is called:

(a) attenuation
(b) amplitude
(c) gain
(d) modulation

A

B-004-001-007
The increase in signal level by an amplifier is called:

(c) gain

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8
Q

B-004-001-008
A device with gain has the property of:

(a) amplification
(b) attenuation
(c) oscillation
(d) modulation

A

B-004-001-008
A device with gain has the property of:

(a) amplification

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9
Q

B-004-001-009
A device labelled “Gain = 10 dB” is likely to be an:

(a) attenuator
(b) oscillator
(c) audio fader
(d) amplifier

A

B-004-001-009
A device labelled “Gain = 10 dB” is likely to be an:

(d) amplifier

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10
Q

B-004-001-010
Amplifiers can amplify:

(a) current, power, or inductance
(b) voltage, current, or power
(c) voltage, power, or inductance
(d) voltage, current, or inductance

A

B-004-001-010
Amplifiers can amplify:

(b) voltage, current, or power

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11
Q

B-004-001-011
Which of the following is not a property of an amplifier?

(a) Gain
(b) Loss
(c) Linearity
(d) Distortion

A

B-004-001-011
Which of the following is not a property of an amplifier?

(b) Loss

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12
Q

B-004-002-001
Zener diodes are used as:

(a) voltage regulators
(b) current regulators
(c) RF detectors
(d) AF detectors

A

B-004-002-001
Zener diodes are used as:

(a) voltage regulators

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13
Q

B-004-002-002
One important application for diodes is recovering information from transmitted signals. This is referred to as:

(a) regeneration
(b) ionization
(c) biasing
(d) demodulation

A

B-004-002-002
One important application for diodes is recovering information from transmitted signals. This is referred to as:

(d) demodulation

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14
Q

B-004-002-003
The primary purpose of a Zener diode is to:

(a) regulate or maintain a constant voltage
(b) provide a voltage phase shift
(c) to boost the power supply voltage
(d) provide a path through which current can flow

A

B-004-002-003
The primary purpose of a Zener diode is to:

(a) regulate or maintain a constant voltage

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15
Q

B-004-002-004
The action of changing alternating current to direct current is called:

(a) rectification
(b) amplification
(c) transformation
(d) modulation

A

B-004-002-004
The action of changing alternating current to direct current is called:

(a) rectification

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16
Q

B-004-002-005
The electrodes of a semiconductor diode are known as:

(a) anode and cathode
(b) gate and source
(c) collector and base
(d) cathode and drain

A

B-004-002-005
The electrodes of a semiconductor diode are known as:

(a) anode and cathode

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17
Q

B-004-002-006
If alternating current is applied to the anode of a diode, what would you expect to see at the cathode?

(a) No signal
(b) Steady direct current
(c) Pulsating alternating current
(d) Pulsating direct current

A

B-004-002-006
If alternating current is applied to the anode of a diode, what would you expect to see at the cathode?

(d) Pulsating direct current

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18
Q

B-004-002-007
In a semiconductor diode, electrons flow from:

(a) anode to cathode
(b) cathode to anode
(c) cathode to grid
(d) grid to anode

A

B-004-002-007
In a semiconductor diode, electrons flow from:

(b) cathode to anode

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19
Q

B-004-002-008
What semiconductor device glows different colours, depending upon its chemical composition?

(a) A light-emitting diode
(b) A fluorescent bulb
(c) A neon bulb
(d) A vacuum diode

A

B-004-002-008
What semiconductor device glows different colours, depending upon its chemical composition?

(a) A light-emitting diode

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20
Q

B-004-002-009
Voltage regulation is the principal application of the:

(a) junction diode
(b) light-emitting diode
(c) Zener diode
(d) vacuum diode

A

B-004-002-009
Voltage regulation is the principal application of the:

(c) Zener diode

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21
Q

B-004-002-010
In order for a diode to conduct, it must be:

(a) close coupled
(b) enhanced
(c) forward-biased
(d) reverse-biased

A

B-004-002-010
In order for a diode to conduct, it must be:

(c) forward-biased

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22
Q

B-004-003-001
Which component can amplify a small signal using low voltages?

(a) A PNP transistor
(b) A variable resistor
(c) An electrolytic capacitor
(d) A multiple-cell battery

A

B-004-003-001
Which component can amplify a small signal using low voltages?

(a) A PNP transistor

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23
Q

B-004-003-002
The basic semiconductor amplifying device is the:

(a) tube
(b) transistor
(c) P-N junction
(d) diode

A

B-004-003-002
The basic semiconductor amplifying device is the:

(b) transistor

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24
Q

B-004-003-003
The three leads from a PNP transistor are named:

(a) collector, emitter and base
(b) drain, base and source
(c) collector, source and drain
(d) gate, source and drain

A

B-004-003-003
The three leads from a PNP transistor are named:

(a) collector, emitter and base

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25
Q

B-004-003-004
If a low level signal is placed at the input to a transistor, a higher level of signal is produced at the output lead. This effect is known as:

(a) detection
(b) modulation
(c) amplification
(d) rectification

A

B-004-003-004
If a low level signal is placed at the input to a transistor, a higher level of signal is produced at the output lead. This effect is known as:

(c) amplification

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26
Q

B-004-003-005
Bipolar transistors usually have:

(a) 1 lead
(b) 2 leads
(c) 4 leads
(d) 3 leads

A

B-004-003-005
Bipolar transistors usually have:

(d) 3 leads

27
Q

B-004-003-006
A semiconductor is described as a “general purpose audio NPN device”. This would be:

(a) a silicon diode
(b) a triode
(c) a bipolar transistor
(d) an audio detector

A

B-004-003-006
A semiconductor is described as a “general purpose audio NPN device”. This would be:

(c) a bipolar transistor

28
Q

B-004-003-007
The two basic types of bipolar transistors are:

(a) diode and triode types
(b) varicap and Zener types
(c) NPN and PNP types
(d) P and N channel types

A

B-004-003-007
The two basic types of bipolar transistors are:

(c) NPN and PNP types

29
Q

B-004-003-008
A transistor can be destroyed in a circuit by:

(a) excessive light
(b) saturation
(c) cut-off
(d) excessive heat

A

B-004-003-008
A transistor can be destroyed in a circuit by:

(d) excessive heat

30
Q

B-004-003-009
In a bipolar transistor, the _____________compares closest to the control grid of a triode vacuum tube.

(a) base
(b) emitter
(c) source
(d) collector

A

B-004-003-009
In a bipolar transistor, the _____________compares closest to the control grid of a triode vacuum tube.

(a) base

31
Q

B-004-003-010
In a bipolar transistor, the _____________compares closest to the plate of a triode vacuum tube.

(a) gate
(b) collector
(c) emitter
(d) base

A

B-004-003-010
In a bipolar transistor, the _____________compares closest to the plate of a triode vacuum tube.

(b) collector

32
Q

B-004-003-011
In a bipolar transistor, the _____________ compares closest to the cathode of a triode vacuum tube.

(a) collector
(b) base
(c) emitter
(d) drain

A

B-004-003-011
In a bipolar transistor, the _____________ compares closest to the cathode of a triode vacuum tube.

(c) emitter

33
Q

B-004-004-001
The two basic types of field effect transistors (FET) are:

(a) NPN and PNP
(b) germanium and silicon
(c) inductive and capacitive
(d) N and P channel

A

B-004-004-001
The two basic types of field effect transistors (FET) are:

(d) N and P channel

34
Q

B-004-004-002
A semiconductor having its leads labelled gate, drain, and source is best described as a:

(a) field-effect transistor
(b) gated transistor
(c) bipolar transistor
(d) silicon diode

A

B-004-004-002
A semiconductor having its leads labelled gate, drain, and source is best described as a:

(a) field-effect transistor

35
Q

B-004-004-003
In a field effect transistor, the ___________ is the terminal that controls the conductance of the channel.

(a) gate
(b) drain
(c) source
(d) collector

A

B-004-004-003
In a field effect transistor, the ___________ is the terminal that controls the conductance of the channel.

(a) gate

36
Q

B-004-004-004
In a field effect transistor, the ___________is the terminal where the charge carriers enter the channel.

(a) gate
(b) drain
(c) emitter
(d) source

A

B-004-004-004
In a field effect transistor, the ___________is the terminal where the charge carriers enter the channel.

(d) source

37
Q

B-004-004-005
In a field effect transistor, the __________ is the terminal where the charge carriers leave the channel.

(a) collector
(b) source
(c) gate
(d) drain

A

B-004-004-005
In a field effect transistor, the __________ is the terminal where the charge carriers leave the channel.

(d) drain

38
Q

B-004-004-006
Which semiconductor device has characteristics most similar to a triode vacuum tube?

(a) Junction diode
(b) Zener diode
(c) Field effect transistor
(d) Bipolar transistor

A

B-004-004-006
Which semiconductor device has characteristics most similar to a triode vacuum tube?

(c) Field effect transistor

39
Q

B-004-004-007
The control element in the field effect transistor is the:

(a) source
(b) gate
(c) drain
(d) base

A

B-004-004-007
The control element in the field effect transistor is the:

(b) gate

40
Q

B-004-004-008
If you wish to reduce the current flowing in a field effect transistor, you could:

(a) decrease the reverse bias voltage
(b) increase the forward bias voltage
(c) increase the reverse bias voltage
(d) increase the forward bias gain

A

B-004-004-008
If you wish to reduce the current flowing in a field effect transistor, you could:

(c) increase the reverse bias voltage

41
Q

B-004-004-009
The source of a field effect transistor corresponds to the _______ of a bipolar transistor.

(a) emitter
(b) base
(c) drain
(d) collector

A

B-004-004-009
The source of a field effect transistor corresponds to the _______ of a bipolar transistor.

(a) emitter

42
Q

B-004-004-010
The drain of a field effect transistor corresponds to the _______ of a bipolar transistor.

(a) base
(b) source
(c) collector
(d) emitter

A

B-004-004-010
The drain of a field effect transistor corresponds to the _______ of a bipolar transistor.

(c) collector

43
Q

B-004-004-011
Which two elements in a field effect transistor exhibit fairly similar characteristics?

(a) Source and gate
(b) Gate and drain
(c) Source and drain
(d) Source and base

A

B-004-004-011
Which two elements in a field effect transistor exhibit fairly similar characteristics?

(c) Source and drain

44
Q

B-004-005-001
What is one reason a triode vacuum tube might be used instead of a transistor in a circuit?

(a) It may be able to handle higher power
(b) It uses less current
(c) It is much smaller
(d) It uses lower voltages

A

B-004-005-001
What is one reason a triode vacuum tube might be used instead of a transistor in a circuit?

(a) It may be able to handle higher power

45
Q

B-004-005-002
Which component can amplify a small signal but must use high voltages?

(a) A transistor
(b) A vacuum tube
(c) An electrolytic capacitor
(d) A multiple-cell battery

A

B-004-005-002
Which component can amplify a small signal but must use high voltages?

(b) A vacuum tube

46
Q

B-004-005-003
A feature common to triode tubes and transistors is that both:

(a) have electrons drifting through a vacuum
(b) can amplify signals
(c) convert electrical energy to radio waves
(d) use heat to cause electron movement

A

B-004-005-003
A feature common to triode tubes and transistors is that both:

(b) can amplify signals

47
Q

B-004-005-004
In a vacuum tube, the electrode that is operated with the highest positive potential is the _________.

(a) filament (heater)
(b) plate
(c) cathode
(d) grid

A

B-004-005-004
In a vacuum tube, the electrode that is operated with the highest positive potential is the _________.

(b) plate

48
Q

B-004-005-005
In a vacuum tube, the electrode that is usually a cylinder of wire mesh is the _______.

(a) filament (heater)
(b) grid
(c) cathode
(d) plate

A

B-004-005-005
In a vacuum tube, the electrode that is usually a cylinder of wire mesh is the _______.

(b) grid

49
Q

B-004-005-006
In a vacuum tube, the element that is furthest away from the plate is the __________.

(a) grid
(b) filament (heater)
(c) emitter
(d) cathode

A

B-004-005-006
In a vacuum tube, the element that is furthest away from the plate is the __________.

(b) filament (heater)

50
Q

B-004-005-007
In a vacuum tube, the electrode that emits electrons is the __________.

(a) grid
(b) cathode
(c) collector
(d) plate

A

B-004-005-007
In a vacuum tube, the electrode that emits electrons is the __________.

(b) cathode

51
Q

B-004-005-008
What is inside the envelope of a triode tube?

(a) Argon
(b) Air
(c) A vacuum
(d) Neon

A

B-004-005-008
What is inside the envelope of a triode tube?

(c) A vacuum

52
Q

B-004-005-009
How many grids are there in a triode vacuum tube?

(a) Two
(b) Three
(c) One
(d) Three plus a filament

A

B-004-005-009
How many grids are there in a triode vacuum tube?

(c) One

53
Q

B-004-006-001
How do you find a resistor’s tolerance rating?

(a) By reading the resistor’s colour code
(b) By using Thevenin’s theorem for resistors
(c) By reading its Baudot code
(d) By using a voltmeter

A

B-004-006-001
How do you find a resistor’s tolerance rating?

(a) By reading the resistor’s colour code

54
Q

B-004-006-002
What do the first three-colour bands on a resistor indicate?

(a) The value of the resistor in ohms
(b) The resistance material
(c) The power rating in watts
(d) The resistance tolerance in percent

A

B-004-006-002
What do the first three-colour bands on a resistor indicate?

(a) The value of the resistor in ohms

55
Q

B-004-006-003
What would the fourth colour band on a 47 ohm resistor indicate?

(a) The value of the resistor in ohms
(b) The power rating in watts
(c) The resistance material
(d) The resistance tolerance in percent

A

B-004-006-003
What would the fourth colour band on a 47 ohm resistor indicate?

(d) The resistance tolerance in percent

56
Q

B-004-006-004
What are the possible values of a 100 ohm resistor with a 10% tolerance?

(a) 90 to 100 ohms
(b) 10 to 100 ohms
(c) 80 to 120 ohms
(d) 90 to 110 ohms

A

B-004-006-004
What are the possible values of a 100 ohm resistor with a 10% tolerance?

(d) 90 to 110 ohms

57
Q

B-004-006-005
How do you find a resistor’s value?

(a) By using a voltmeter
(b) By using Thevenin’s theorem for resistors
(c) By using the Baudot code
(d) By using the resistor’s colour code

A

B-004-006-005
How do you find a resistor’s value?

(d) By using the resistor’s colour code

58
Q

B-004-006-006
A club project requires that a resistive voltage divider provide a very accurate and predictable ratio. Out of the list below, which resistor tolerance would you select?

(a) 0.1%
(b) 5%
(c) 10%
(d) 20%

A

B-004-006-006
A club project requires that a resistive voltage divider provide a very accurate and predictable ratio. Out of the list below, which resistor tolerance would you select?

(a) 0.1%

59
Q

B-004-006-007
You need a current limiting resistor for a light-emitting diode (LED). The actual resistance is not critical at all. Out of the list below, which resistor tolerance would you select?

(a) 0.1%
(b) 5%
(c) 20%
(d) 10%

A

B-004-006-007
You need a current limiting resistor for a light-emitting diode (LED). The actual resistance is not critical at all. Out of the list below, which resistor tolerance would you select?

(c) 20%

60
Q

B-004-006-008
If a carbon resistor’s temperature is increased, what will happen to the resistance?

(a) It will stay the same
(b) It will become time dependent
(c) It will change depending on the resistor’s temperature coefficient rating
(d) It will increase by 20% for every 10 degrees centigrade

A

B-004-006-008
If a carbon resistor’s temperature is increased, what will happen to the resistance?

(c) It will change depending on the resistor’s temperature coefficient rating

61
Q

B-004-006-009
A gold tolerance band on a resistor indicates the tolerance is:

(a) 5%
(b) 20%
(c) 10%
(d) 1%

A

B-004-006-009
A gold tolerance band on a resistor indicates the tolerance is:

(a) 5%

62
Q

B-004-006-010
Which colour band would differentiate a 120-ohm from a 1200-ohm resistor?

(a) First band
(b) Second band
(c) Fourth band
(d) Third band

A

B-004-006-010
Which colour band would differentiate a 120-ohm from a 1200-ohm resistor?

(d) Third band

63
Q

B-004-006-011
Given that red=2, violet=7 and yellow=4, what is the nominal value of a resistor whose colour code reads “red”, “violet” and “yellow”?

(a) 270 kilohms
(b) 274 ohms
(c) 72 kilohms
(d) 27 megohms

A

B-004-006-011
Given that red=2, violet=7 and yellow=4, what is the nominal value of a resistor whose colour code reads “red”, “violet” and “yellow”?

(a) 270 kilohms

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