Canadian Basic Qualification Question Pool
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A circuit designed to increase the level of its input signal is called:
an amplifier
a modulator
an oscillator
a receiver
B-004-01-02
If an amplifier becomes non- linear, the output signal would:
become distorted
be saturated
cause oscillations
overload the power supply
B-004-01-03
To increase the level of very weak radio signals from an antenna, you would use:
an RF oscillator
an audio oscillator
an RF amplifier
an audio amplifier
B-004-01-04
To increase the level of very weak signals from a microphone you would use:
an RF oscillator
an RF amplifier
an audio amplifier
an audio oscillator
B-004-01-05
The range of frequencies to be amplified by a speech amplifier is typically:
3 to 300 Hz
300 to 1000 Hz
40 to 40 000 Hz
300 to 3400 Hz
B-004-01-06
Which of the following IS NOT amplified by an amplifier?
current
resistance
power
voltage
B-004-01-07
The increase in signal level by an amplifier is called:
attenuation
amplitude
modulation
gain
B-004-01-08
A device with gain has the property of:
attenuation
oscillation
modulation
amplification
B-004-01-09
A device labelled "Gain = 10 dB" is likely to be an:
attenuator
oscillator
audio fader
amplifier
B-004-01-10
Amplifiers can amplify:
current, power, or inductance
voltage, current, or power
voltage, power, or inductance
voltage, current, or inductance
B-004-01-11
Which of the following is not a property of an amplifier?
gain
linearity
distortion
loss
B-004-02-01
Zener diodes are used as:
current regulators
voltage regulators
RF detectors
AF detectors
B-004-02-02
One important application for diodes is recovering information from transmitted signals. This is referred to as:
regeneration
ionization
biasing
demodulation
B-004-02-03
The primary purpose of a Zener diode is to:
provide a voltage phase shift
regulate or maintain a constant voltage
to boost the power supply voltage
provide a path through which current can flow
B-004-02-04
The action of changing alternating current to direct current is called:
amplification
rectification
transformation
modulation
B-004-02-05
The electrodes of a semi- conductor diode are known as:
gate and source
anode and cathode
collector and base
cathode and drain
B-004-02-06
If alternating current is applied to the anode of a diode, what would you expect to see at the cathode?
No signal
Steady direct current
Pulsating direct current
Pulsating alternating current
B-004-02-07
In a semi-conductor diode, electrons flow from:
anode to cathode
cathode to grid
grid to anode
cathode to anode
B-004-02-08
What semi-conductor device glows red, yellow, or green, depending upon its chemical composition?
A light-emitting diode
A fluorescent bulb
A neon bulb
A vacuum diode
B-004-02-09
Voltage regulation is the principal application of the:
junction diode
light-emitting diode
vacuum diode
Zener diode
B-004-02-10
In order for a diode to conduct, it must be:
close coupled
forward-biased
enhanced
reverse-biased
B-004-03-01
Which component can amplify a small signal using low voltages?
A variable resistor
An electrolytic capacitor
A multiple-cell battery
A PNP transistor
B-004-03-02
The basic semi-conductor amplifying device is the:
tube
P-N junction
transistor
diode
B-004-03-03
The three leads from a PNP transistor are named:
drain, base and source
collector, emitter and base
collector, source and drain
gate, source and drain
B-004-03-04
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 know as:
detection
modulation
rectification
amplification
B-004-03-05
Bipolar transistors usually have:
2 leads
3 leads
1 lead
4 leads
B-004-03-06
A semi-conductor is described as a "general purpose audio NPN device". This would be:
a bipolar transistor
a silicon diode
a triode
an audio detector
B-004-03-07
The two basic types of bipolar transistors are:
diode and triode types
NPN and PNP types
varicap and zener types
P and N channel types
B-004-03-08
A transistor can be destroyed in a circuit by:
excessive heat
excessive light
saturation
cut-off
B-004-03-09
In a bipolar transistor, the _____________compares closest to the control grid of a triode vacuum tube.
emitter
base
source
collector
B-004-03-10
In a bipolar transistor, the _____________compares closest to the plate of a triode vacuum tube.
gate
emitter
collector
base
B-004-03-11
In a bipolar transistor, the _____________ compares closest to the cathode of a triode vacuum tube.
collector
base
drain
emitter
B-004-04-01
The two basic types of field effect transistors (FET) are:
NPN and PNP
germanium and silicon
inductive and capacitive
N and P channel
B-004-04-02
A semi-conductor having its leads labeled gate, drain, and source is best described as a:
gated transistor
field-effect transistor
bipolar transistor
silicon diode
B-004-04-03
In a field effect transistor, the ___________ is the terminal that controls the conductance of the channel.
gate
drain
source
collector
B-004-04-04
In a field effect transistor, the ___________is the terminal where the charge carriers enter the channel.
source
gate
drain
emitter
B-004-04-05
In a field effect transistor, the __________ is the terminal where the charge carriers leave the channel.
collector
source
drain
gate
B-004-04-06
Which semi-conductor device has characteristics most similar to a triode vacuum tube?
Junction diode
Zener diode
Field effect transistor
Bipolar transistor
B-004-04-07
The control element in the field effect transistor is the:
gate
source
drain
base
B-004-04-08
If you wish to reduce the current flowing in a field effect transistor, you could:
increase the reverse bias voltage
decrease the reverse bias voltage
increase the forward bias voltage
increase the forward bias gain
B-004-04-09
The source of a field effect transistor corresponds to the _______ of a bipolar transistor.
base
emitter
drain
collector
B-004-04-10
The drain of a field effect transistor corresponds to the _______ of a bipolar transistor.
base
collector
source
emitter
B-004-04-11
Which two elements in a field effect transistor exhibit fairly similar characteristics?
Source and gate
Gate and drain
Source and base
Source and drain
B-004-05-01
What is one reason a triode vacuum tube might be used instead of a transistor in a circuit?
It uses less current
It may be able to handle higher power
It is much smaller
It uses lower voltages
B-004-05-02
Which component can amplify a small signal but must use high voltages?
A vacuum tube
A transistor
An electrolytic capacitor
A multiple-cell battery
B-004-05-03
A feature common to tubes and transistors is that both:
have electrons drifting through a vacuum can amplify signals
convert electrical energy to radio waves
use heat to cause electron movement
B-004-05-04
In a vacuum tube, the electrode that is operated with the highest positive potential is the _________.
filament (heater)
plate
cathode
grid
B-004-05-05
In a vacuum tube, the electrode that is usually a cylinder of wire mesh is the _______.
filament (heater)
grid
cathode
plate
B-004-05-06
In a vacuum tube, the element that is furthest away from the plate is the __________.
grid
emitter
cathode
filament (heater)
B-004-05-07
In a vacuum tube, the electrode that emits electrons is the __________.
cathode
grid
collector
plate
B-004-05-08
What is inside the envelope of a triode tube?
argon
a vacuum
air
neon
B-004-05-09
How many grids are there in a triode vacuum tube?
two
three
three plus a filament
one
B-004-05-10
If you do not wish to have current flowing in the grid circuit of a vacuum tube, the grid should be:
positive with respect to the anode
negative with respect to the cathode
positive with respect to both cathode and anode
positive with respect to the cathode
B-004-05-11
The negative DC control voltage applied to the control grid of a vacuum tube is called:
suppression voltage
bias voltage
repulsion voltage
excitation voltage
B-004-06-01
How do you find a resistor's tolerance rating?
By using Thevenin's theorem for resistors
By reading the resistor's color code
By reading its Baudot code
By using a voltmeter
B-004-06-02
What do the first three-color bands on a resistor indicate?
The resistance material
The power rating in watts
The value of the resistor in ohms
The resistance tolerance in percent
B-004-06-03
What does the fourth color band on a resistor mean?
The value of the resistor in ohms
The power rating in watts
The resistance material
The resistance tolerance in percent
B-004-06-04
What are the possible values of a 100 ohm resistor with a 10% tolerance?
90 to 110 ohms
90 to 100 ohms
10 to 100 ohms
80 to 120 ohms
B-004-06-05
How do you find a resistor's value?
By using the resistor's color code
By using a voltmeter
By using Thevenin's theorem for resistors
By using the Baudot code
B-004-06-06
Which tolerance rating would a high-quality resistor have?
5%
10%
20%
0.1%
B-004-06-07
Which tolerance rating would a low-quality resistor have?
20%
0.1%
5%
10%
B-004-06-08
If a carbon resistor's temperature is increased, what will happen to the resistance?
It will stay the same
It will change depending on the resistor's temperature coefficient rating
It will become time dependent
It will increase by 20% for every 10 degrees centigrade
B-004-06-09
A gold band on a resistor indicates the tolerance is:
20%
10%
5%
1%
B-004-06-10
A resistor with a colour code of brown, black, and red, would have a value of:
1000 ohms
100 ohms
10 ohms
10 000 ohms
B-004-06-11
A resistor is marked with the colors red, violet and yellow. This resistor has a value of:
274
72 k
27 M
270 k