Two voltage given as -2 V and -1 V in positive logic convention represent:

This question was previously asked in
DFCCIL Executive S&T 2018 Official Paper
View all DFCCIL Executive Papers >
  1. -2 V is logic 1 and -1 V is logic 0
  2. -5 V is logic 0 in some circuit and 1 in the other
  3. -2 V is logic 0 and -1 V is logic 1
  4. -5 V is logic 1 in some circuits and 0 in the other

Answer (Detailed Solution Below)

Option 3 : -2 V is logic 0 and -1 V is logic 1
Free
RRB NTPC ASM CBAT Psycho Full Practice Set 1 (Easy to Moderate)
49.9 K Users
165 Questions 130 Marks 48 Mins

Detailed Solution

Download Solution PDF

Concept:

The terms positive logic and negative logic refer to two conventions that tell the relationship between logical values and the voltages used to represent them.

1. Logic 0  is always used to represent false and logic 1 is always used to represent true in Boolean Algebra.

2. Positive Logic Convention:

In this, the more positive potential is considered to represent true or logic 1, and the more negative potential is considered to represent false or logic 0.

3. Negative Logic Convention:

In this, the more negative potential is considered to represent true or logic 1, and the more positive potential is considered to represent false or logic 0.

Calculation:

Two voltages are given -2 V and -1 V

As we have to represent them in the positive logic convention:

-2 V will represent logic 0 as it is more negative and

-1 V will represent logic 1.

Hence option (3) is the correct answer.

Important Points

NMOS uses positive logic Convention

F1 Tapesh Madhuri 10.05.2021 D1

PMOS uses negative logic Convention.

F1 Tapesh Madhuri 10.05.2021 D2

Latest DFCCIL Executive Updates

Last updated on Jul 7, 2025

-> DFCCIL admit card 2025 for Executives has been released at the official website.

-> DFCCIL Executive exam date 2025 has been released. DFCCIL exam date is July 10 & 11.

-> DFCCIL Executive city intimation slip has been released. 

->  DFCCIL Executive Recruitment 2025 Correction window is open from 31st March, to 4th April 2025.

-> Candidates can make corrections in their application form, if they have made any mistake. There will be 100/- fee for correction in form.

-> DFCCIL Executive Recruitment 2025 application deadline has been extended.

-> Eligible and Interested candidates had applied from 18th January 2025 to 22nd March 2025.  

-> A total of 175 Vacancies have been announced for multiple posts like Executive (Civil, Electrical, Signal and Telecommunication).

-> Candidates who will get a successful selection under the DFCCIL Recruitment 2025 for the Executive selection process will get a salary range between Rs. 30,000 to Rs. 1,20,000.

-> Candidates must refer to the DFCCIL Executive Previous Year Papers to prepare well for the exam.

Get Free Access Now
Hot Links: teen patti master lotus teen patti teen patti earning app teen patti real cash withdrawal teen patti stars