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Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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12 questions

SA-PX-DC-0011 markL1 FoundationCalculatorModulation
Speech with frequencies up to 4.54.5 kHz is transmitted by AM. Calculate the bandwidth in kHz.

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Salam Academy Original Practice · Proposed mark scheme
SA-PX-DC-0031 markL1 FoundationCalculatorModulation
Calculate the wavelength in m of a 100100 MHz FM carrier.

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Salam Academy Original Practice · Proposed mark scheme
SA-PX-DC-0051 markL1 FoundationCalculatorMedia
An advantage of optical fibre over copper cable is
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Salam Academy Original Practice · Proposed mark scheme
SA-PX-DC-0061 markL1 FoundationCalculatorModulation
FM gives better sound quality than AM mainly because
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Salam Academy Original Practice · Proposed mark scheme
SA-PX-DC-0081 markL1 FoundationCalculatorModulation
A carrier wave is used in radio communication because
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Salam Academy Original Practice · Proposed mark scheme
SA-PX-DC-X011 markL1 FoundationCalculatorModulation
An AM signal carries frequencies up to 3.03.0 kHz. Calculate the bandwidth in kHz.

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Salam Academy Original Practice · Proposed mark scheme
SA-PX-DC-X021 markL1 FoundationCalculatorModulation
Calculate the wavelength, in m, of a 200200 kHz long-wave carrier.

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Salam Academy Original Practice · Proposed mark scheme
SA-PX-DC-X041 markL1 FoundationCalculatorMedia
2424 channels of 6464 kbit s⁻¹ share one link by time-division multiplexing. Calculate the minimum link bit rate in kbit s⁻¹.

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Salam Academy Original Practice · Proposed mark scheme
SA-PX-DC-0021 markL2 StandardCalculatorModulation
An FM broadcast has frequency deviation 7575 kHz and maximum signal frequency 1515 kHz. Calculate its bandwidth in kHz.

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Salam Academy Original Practice · Proposed mark scheme
SA-PX-DC-0041 markL2 StandardCalculatorMedia
Eight telephone channels, each 6464 kbit s⁻¹, share a link by time-division multiplexing. Calculate the minimum link bit rate in kbit s⁻¹.

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Salam Academy Original Practice · Proposed mark scheme
SA-PX-DC-X031 markL2 StandardCalculatorModulation
An FM signal has deviation 5050 kHz and maximum signal frequency 1010 kHz. Calculate its bandwidth in kHz.

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Salam Academy Original Practice · Proposed mark scheme
SA-PX-DC-0072 marksL3 ExamCalculatorModulation
A waveband from 540540 kHz to 16111611 kHz carries AM stations each with a maximum signal frequency of 4.54.5 kHz. Calculate the maximum number of stations that fit without overlap.

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Salam Academy Original Practice · Proposed mark scheme