1. The main function of an antenna in a radio receiver is to:
Answer:
Explanation:
The antenna's primary function in a radio receiver is to capture radio waves and convert them into electrical signals that can be processed by the receiver.
2. In radio communication, the process of combining a signal with a carrier frequency is called:
Answer:
Explanation:
Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.
3. Which component in a radio receiver is used for tuning to select a specific frequency?
Answer:
Explanation:
The tuner in a radio receiver is used to select a specific frequency or station. It typically adjusts the frequency of the receiver's local oscillator to match the desired frequency.
4. Superheterodyne receivers convert the received signal to what frequency for easier processing?
Answer:
Explanation:
Superheterodyne receivers convert the frequency of the received signal to a lower intermediate frequency (IF) for more convenient processing and filtering.
5. The purpose of the Intermediate Frequency (IF) stage in a radio receiver is to:
Answer:
Explanation:
The IF stage in a radio receiver is designed to filter and amplify the desired signal. It operates at a fixed intermediate frequency, allowing for efficient filtering and amplification.
6. In a radio receiver, the local oscillator's purpose is to:
Answer:
Explanation:
The local oscillator in a radio receiver generates a frequency that is mixed with the incoming signal to produce an intermediate frequency (IF) for further processing.
7. The process of extracting the original audio signal from the modulated carrier wave in a receiver is known as:
Answer:
Explanation:
Demodulation is the process in a radio receiver that extracts the original audio or information signal from the modulated carrier wave.
8. A crystal set radio receiver is characterized by:
Answer:
Explanation:
A crystal set radio receiver operates without a separate power source, relying on the power of the received radio signal itself to produce sound.
9. Frequency Modulation (FM) radio receivers are preferred over Amplitude Modulation (AM) receivers due to their:
Answer:
Explanation:
FM radio receivers are preferred over AM receivers because FM signals have reduced susceptibility to noise and interference, providing better sound quality.
10. Automatic Gain Control (AGC) in a radio receiver is used to:
Answer:
Explanation:
Automatic Gain Control (AGC) in a radio receiver automatically adjusts the receiver's gain based on the strength of the incoming signal to maintain a constant output level.
11. The purpose of a band-pass filter in a radio receiver is to:
Answer:
Explanation:
A band-pass filter in a radio receiver allows signals within a certain frequency range to pass while blocking frequencies outside this range, aiding in the tuning process.
12. The process of mixing a received signal with a locally generated signal in a receiver is known as:
Answer:
Explanation:
Heterodyning in radio receivers involves mixing the received signal with a signal from a local oscillator, producing an intermediate frequency (IF) signal for easier processing.
13. A squelch circuit in a radio receiver is used to:
Answer:
Explanation:
A squelch circuit in a radio receiver mutes or suppresses the audio output when there is no strong received signal, reducing static noise.
14. An RF amplifier in a radio receiver is located:
Answer:
Explanation:
The RF (Radio Frequency) amplifier in a radio receiver is typically located before the mixer stage to amplify the received signal before it is mixed with the local oscillator signal.
15. What component in a radio receiver is responsible for converting electrical signals into sound?
Answer:
Explanation:
The speaker in a radio receiver converts electrical signals into sound, allowing listeners to hear the broadcasted audio content.
16. Selectivity in a radio receiver refers to its ability to:
Answer:
Explanation:
Selectivity is a measure of a radio receiver's ability to separate adjacent stations or channels and focus on a single desired signal without interference from others.
17. A dipole antenna in a radio receiver is commonly used for:
Answer:
Explanation:
A dipole antenna, consisting of two metal rods or wires, is commonly used in radio receivers for receiving FM and shortwave signals due to its simplicity and effectiveness.
18. The main disadvantage of Direct Conversion Receivers is their:
Answer:
Explanation:
Direct Conversion Receivers, or homodyne receivers, are susceptible to image frequency interference, where signals at frequencies symmetrically spaced from the desired frequency can produce unwanted responses.
19. The 'IF' in 'IF amplifier' stands for:
Answer:
Explanation:
In an 'IF amplifier,' IF stands for Intermediate Frequency. The IF amplifier amplifies the signal at this fixed frequency after the received signal is mixed with the local oscillator signal.
20. A 'double conversion' superheterodyne receiver uses:
Answer:
Explanation:
A 'double conversion' superheterodyne receiver uses two stages of frequency conversion and typically employs two sets of IF amplifiers operating at different frequencies for improved selectivity and image rejection.
21. In a superheterodyne receiver, the purpose of the mixer stage is to:
Answer:
Explanation:
The mixer stage in a superheterodyne receiver mixes the incoming radio frequency signal with a local oscillator signal to convert it to a fixed intermediate frequency (IF) for more efficient processing.
22. Automatic Frequency Control (AFC) in radio receivers is used to:
Answer:
Explanation:
Automatic Frequency Control (AFC) is used in radio receivers to automatically maintain the correct tuning frequency and compensate for any drift in the tuning circuit.
23. The sensitivity of a radio receiver refers to its ability to:
Answer:
Explanation:
The sensitivity of a radio receiver is a measure of its ability to detect and amplify weak signals.
24. A ferrite rod antenna in AM radio receivers is primarily used to:
Answer:
Explanation:
Ferrite rod antennas in AM radio receivers are used to enhance the reception of low-frequency signals. The ferrite material concentrates the magnetic component of the radio waves.
25. The primary advantage of digital radio receivers over analog receivers is:
Answer:
Explanation:
Digital radio receivers offer improved sound quality and reduced noise compared to analog receivers. They are more efficient in processing signals and provide clearer audio output.