Camera pickup tubes — match each tube to its notable feature List I (Tube) A. Vidicon B. Plumbicon C. Saticon D. Newvicon List II (Special feature) 1. Highest sensitivity 2. Temperature sensitive 3. Large lag 4. Special target for improved red response
-
AA-4, B-3, C-2, D-1
-
BA-1, B-2, C-3, D-4
-
CA-3, B-4, C-2, D-1
-
DA-4, B-3, C-1, D-2
Answer
Correct Answer: A-3, B-4, C-2, D-1
Explanation
Introduction / Context:Before solid-state image sensors, television cameras employed a range of pickup tubes with distinct target materials and behaviors. Recognizing each tube’s hallmark helps in interpreting legacy system specifications and exam questions on camera technology.
Given Data / Assumptions:
- Vidicon uses a photoconductive target; notable for image lag.
- Plumbicon (lead-oxide target) offers improved red response compared with earlier tubes.
- Saticon (Se-As-Te) exhibits temperature sensitivity in operation.
- Newvicon was developed for higher sensitivity among vidicon-type tubes.
Concept / Approach:Associate each tube with the well-known trait emphasized in textbooks: vidicon → lag; plumbicon → better red response; saticon → temperature sensitivity; newvicon → highest sensitivity in its family.
Step-by-Step Solution:
A (Vidicon) → 3 (large lag).B (Plumbicon) → 4 (special red response).C (Saticon) → 2 (temperature sensitive).D (Newvicon) → 1 (highest sensitivity).Verification / Alternative check:Historic broadcast engineering references compare these tubes’ sensitivity, lag, and spectral response, aligning with the matches above.
Why Other Options Are Wrong:
- Assigning “highest sensitivity” to a plain vidicon conflicts with well-known limitations.
- Swapping red response and lag traits contradicts materials behavior.
Common Pitfalls:Assuming solid-state CMOS/CCD characteristics apply; tubes have different lag and spectral idiosyncrasies.
Final Answer:A-3, B-4, C-2, D-1