Question
Download Solution PDFWhy crystal receiver has poor selectivity?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct option is 4
Concept:
The selectivity of a radio receiver is its ability to select a particular signal station and reject others in the frequency spectrum.
- A crystal radio receiver, or crystal set, is a very simple radio receiver, popular in the early days of radio. It needs no other power source but that received from radio waves by an antenna.
- It uses a crystal detector (composed of a piezoelectric crystal such as galena) to demodulate the signal.
- In a crystal receiver, there oftentimes isn't a clear, defined "tuned circuit." A tuned circuit (like an LC circuit) allows for specific frequencies to be selected and others to be rejected, improving the selectivity of the receiver.
The other options:
1) No loudspeaker is used: This might affect the volume or audibility but not the selectivity.
2) No battery is used: The absence of batteries is a defining feature of crystal radios, but this doesn't directly impact their selectivity.
3) It has a long antenna: The length of the antenna can affect reception, but doesn't directly correlate to the selectivity of the receiver.
Last updated on Jul 2, 2025
-> RRB ALP CBT 2 Result 2025 has been released on 1st July at rrb.digialm.com.
-> RRB ALP Exam Date OUT. Railway Recruitment Board has scheduled the RRB ALP Computer-based exam for 15th July 2025. Candidates can check out the Exam schedule PDF in the article.
> TNPSC Group 4 Hall Ticket has been published by the Tamil Nadu Public Service Commission
-> Railway Recruitment Board activated the RRB ALP application form 2025 correction link, candidates can make the correction in the application form till 31st May 2025.
-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.
-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.
-> The official RRB ALP Recruitment 2025 provides an overview of the vacancy, exam date, selection process, eligibility criteria and many more.
->The candidates must have passed 10th with ITI or Diploma to be eligible for this post.
->The RRB Assistant Loco Pilot selection process comprises CBT I, CBT II, Computer Based Aptitude Test (CBAT), Document Verification, and Medical Examination.
-> This year, lakhs of aspiring candidates will take part in the recruitment process for this opportunity in Indian Railways.
-> Serious aspirants should prepare for the exam with RRB ALP Previous Year Papers.
-> Attempt RRB ALP GK & Reasoning Free Mock Tests and RRB ALP Current Affairs Free Mock Tests here