CET Coding & Classification Systems 3 — Questions and Answers
Question 1: Which SMD resistor code represents a value of 47 kΩ?
- 473 (Correct answer)
- 474
- 470
- 477
Correct answer: 473
SMD resistor code 473 means 47 × 10³ = 47,000 Ω = 47 kΩ; the last digit is the power of ten.
Question 2: In ASCII, the decimal value 65 corresponds to which character?
- a
- A (Correct answer)
- 1
- @
Correct answer: A
ASCII decimal 65 is the uppercase letter 'A'; lowercase 'a' is decimal 97.
Question 3: What is the two's complement representation of −25 in an 8-bit system?
- 11100110
- 11100111 (Correct answer)
- 10011001
- 11001001
Correct answer: 11100111
25 in binary is 00011001; inverting all bits gives 11100110, and adding 1 yields 11100111, which is −25 in two's complement.
Question 4: Which EIA standard governs the standard preferred number series (E12, E24, E96) for resistor values?
- EIA-198
- EIA-481
- EIA-96 (Correct answer)
- EIA-RS-385
Correct answer: EIA-96
The EIA-96 standard defines the E96 series of preferred resistor values and is also commonly referenced for SMD coding using alphanumeric codes.
Question 5: In the IEC 60062 capacitor color code, a brown band in the multiplier position represents a multiplier of:
- 1
- 10 (Correct answer)
- 100
- 1000
Correct answer: 10
Brown in the multiplier band of the IEC capacitor color code represents ×10, consistent with its value in the resistor color code.
Question 6: The octal number 37 converted to binary is:
- 011111 (Correct answer)
- 100111
- 011110
- 101011
Correct answer: 011111
Octal 3 = binary 011 and octal 7 = binary 111, so octal 37 = binary 011111.
Question 7: In JEDEC semiconductor numbering, a device beginning with '1N' is classified as a:
- Bipolar transistor
- Field-effect transistor
- Diode (Correct answer)
- Thyristor
Correct answer: Diode
JEDEC devices beginning with '1N' are diodes (one junction), while '2N' devices are transistors (two junctions).
CET Coding & Classification Systems 3
Which SMD resistor code represents a value of 47 kΩ?