WorksheetsTelecommunication Quiz
Total questions: 37
Worksheet time: 32mins
Which of the following best defines telecommunication?
Sending mail over long distances
Transmitting and receiving information electronically
Printing documents remotely
Encoding digital data manually
What is the main function of electronic communication?
Storing data
Designing hardware
Transferring information
Programming circuits
Which element in a communication system converts information into a transmittable signal?
Receiver
Modulator
Sink
Transducer
Which of the following is an example of simplex communication?
Telephone
Walkie-talkie
Broadcast radio
Video call
Full-duplex communication allows:
One-way data transfer
Two-way data, one at a time
Two-way simultaneous communication
Delayed communication
Which part of a telecommunication system introduces the modulated signal into the channel?
Receiver
Transmitter
Demodulator
Media
In telecommunication, the 'channel' refers to:
The data processor
The signal amplifier
The transmission medium
The signal converter
Which terminal component acts as an interface between user and transmission?
Transformer
Speaker
Transducer
Oscillator
Which wave property measures the “height” of the signal from its central point?
Frequency
Phase
Amplitude
Wavelength
In communication, frequency is measured in:
Volt
Watt
Ohm
Hertz
The phase of a signal is measured in:
Volts
Seconds
Degrees
Amperes
A sine wave signal with a frequency of 1kHz has a period of:
1 second
1 millisecond
1 microsecond
1 nanosecond
Which frequency range is used in AM radio broadcasting?
3–30 MHz
0.3–3 MHz
30–300 kHz
30–300 MHz
Which of the following has the widest bandwidth?
Voice telephone
Audio analog signal
TV broadcast
AM radio
The formula to calculate wavelength (λ) is:
λ = C + f
λ = f / C
λ = C / f
λ = C × f
What is modulation?
Amplifying a signal
Changing carrier properties in relation to an information signal
Filtering unwanted signals
Encoding data for storage
Why is modulation necessary?
To slow down the signal
To avoid signal processing
To convert to appropriate frequency for transmission
To store data
Amplitude modulation affects which part of the carrier signal?
Frequency
Phase
Amplitude
Bandwidth
Which component carries the modulating signal?
Carrier signal
RF oscillator
Transducer
Power amplifier
The modulated waveform in AM is known as:
Square wave
Sideband
AM envelope
Carrier frequency
In AM, the carrier and sidebands form the:
Bandwidth
Wave spectrum
Transmission line
AM envelope
The formula for modulation index (m) is:
m = Ec / Em
m = Em / Ec
m = Em × Ec
m = Ec + Em
What is the typical range of modulation index (m) in AM?
1 to 10
0 to 2
0 to 1
-1 to 1
Overmodulation occurs when:
m > 1
m = 1
m < 0
m = 0
Sidebands in AM carry:
Carrier energy only
Original information
Noise
RF power
The bandwidth of an AM signal is:
Twice the modulating frequency
Equal to the carrier frequency
Half the carrier frequency
Equal to the audio signal bandwidth
The total transmitted power in AM is the sum of:
Modulation power only
Carrier and both sidebands power
Sidebands only
Voltage and current
If the modulating signal has multiple frequencies, the resulting AM signal will have:
One sideband
Multiple sidebands
One carrier only
Zero bandwidth
What does the AM voltage equation combine?
Transmitter, receiver, and antenna
Carrier and information signals
Frequency and wavelength
AM and FM signals
In practice, AM modulating signals are usually:
Constant DC signals
Pure sine waves
Complex waveforms
Random pulses
Which of the following is NOT a reason why modulation is needed?
To reduce antenna size
To transmit signals over long distances
To increase the frequency range of noise
To allow simultaneous transmission from multiple sources
Modulation allows different transmitters to be distinguished by using:
High voltage
Unique antenna types
Different carrier frequencies
Specific signal colors
What benefit does modulation offer for antenna design?
Enables non-metallic antennas
Allows for shorter antennas
Eliminates need for antennas
Requires longer antennas for better range
Which of the following statements best describes the main goal of modulation?
To increase the size of the signal
To filter noise before transmission
To convert information signals to a suitable form for transmission
To transmit signals at very low frequencies
Why are original signals usually unsuitable for direct transmission?
They are too complex to process
They contain excessive noise
They are typically low in frequency
They require special fiber optics
Why do we need modulation?
Explain the differences between amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM).
