GATE ECE 1999 | GATE ECE Year Wise Previous Years Questions

GATE ECE 1999

Subjective

-0

In certain application, four inputs A, B, C, D (both true and complement forms available)are fed to logic circuit, producing an output F which operates a relay. The relay turns on when F(ABCD)=1 for the following states of the inputs (ABCD):'0000', '0010' ,0101',0110','1101' and '1110'. States '1000' and '1001' do not occur, and for the remaining states, the relay is off. Minaining states, the relay is off. Minimize F with the help of a Karnaugh map and realize it using a minimum number of 3- input NAND gates.

GATE ECE 1999

MCQ (Single Correct Answer)

-0.6

For a binary half-sub-tractor having two inputs A and B, the correct set of logical expressions for the outputs D (=A minus B) and X (=borrow) are

$$D = \,AB + \overline A \,B,\,X = \overline A \,B$$

$$D = \,\overline A \,B + A\overline B + A\overline B ,\,X = A\overline B $$

$$D = \,\overline A \,B + A\overline B ,\,X = \overline A \,B$$

$$D = \,AB + \overline A \,\overline B ,\,X = A\overline B $$

GATE ECE 1999

MCQ (Single Correct Answer)

-0.6

The ripple counter shown in the figure works as a GATE ECE 1999 Digital Circuits - Sequential Circuits Question 43 English

mod – 3 up counter

mod – 5 up counter

mod – 3 down counter

mod – 5 down counter

GATE ECE 1999

MCQ (Single Correct Answer)

-0.3

Commercially available ECL gates use two ground lines and one negative supply in order to

reduce power dissipation

increase fan-out

reduce loading effect

eliminate the effect of power line glitches or the biasing circuit.

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