Advertisements
Advertisements
प्रश्न
Write the truth table for circuit given in figure below consisting of NOR gates and identify the logic operation (OR, AND, NOT) which this circuit is performing.
(Hint: A = 0, B = 1 then A and B inputs of second NOR gate will be 0 and hence Y=1. Similarly work out the values of Y for other combinations of A and B. Compare with the truth table of OR, AND, NOT gates and find the correct one.)
Advertisements
उत्तर
A and B are the inputs of the given circuit. The output of the first NOR gate is `bar(A +B)`. It can be observed from the following figure that the inputs of the second NOR gate become the out put of the first one.
Hence, the output of the combination is given as:
`Y = bar(bar("A+B") + bar("A+B")) = bar(bar("A").bar("B")) + bar(bar"A".bar"B")`
`= bar(bar"A".bar"B") = bar(bar"A") + bar(bar"B") = "A + B"`
The truth table for this operation is given as:
| A | B | Y (=A + B) |
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
This is the truth table of an OR gate. Hence, this circuit functions as an OR gate.
संबंधित प्रश्न
The following figure shows the input waveforms (A, B) and the output waveform (Y) of a gate. Identify the gate, write its truth table and draw its logic symbol.
The logic gate which produces LOW output when one of the input is HIGH and produces
HIGH output only when all of its inputs are LOW is called _______.
(A) AND gate
(B) OR gate
(C) NOR gate
(D) NAND gate
Write the truth table for the circuits given in following figure consisting of NOR gates only. Identify the logic operations (OR, AND, NOT) performed by the two circuits.
(a)
(b)
Draw the schematic symbols for AND, OR, NOT and NAND gate
The arrangement given below represents a logic gate :
Copy the following truth table in your answer booklet and complete it showing outputs at C
and D.
| A | B | C | D |
| 0 | 0 | ||
| 1 | 0 | ||
| 0 | 1 | ||
| 1 | 0 |
Answer the following question :
Distinguish between digital and analogue signals.
Identify the logic gate represented by the circuit as shown and write its truth table.
What will be the values of input A and B for the Boolean expression `overline ((A +B) .(A*B)) =1?`
An AND gate can be prepared by repetitive use of
(a) NOT gate
(b) OR gate
(c) NAND gate
(d) NOR gate.
(i) Write the truth tables of the logic gates marked P and Q in the given circuit.
(ii) Write the truth table for the circuit.
With the help of a diagram, show how you can use several NAND gates to obtain an OR gate.
Useful Constants and Relations :
| 1. Speed of Light in Vacuum | (c) = 3.00 x 108 m/s |
| 2. Charge of a proton | (e) = 1.60 x 10-19C |
| 3. Planck's Constant | (h) = 6.6 x 10-34 Js |
| 4. Permeability of vacuum | (μ0) = 4π x 10-7 Hm-1 |
| 5. Electron Volt | (1eV ) = 1.6 x 10 |
| 6. Unified Atomic Mass Unit | (1u) = 931 MeV |
| (π) = 3.14 | |
| ( ln 2 ) = 0.693 |
You are given circuit as shown in the figure, which consists of NAND gate. Identify the logic operation carried out by the two. Write the truth table. Identify the gates equivalent to the tow circuits.
The current obtained from a simple filterless rectifier is
A radar is sending out pules of 1 micro second duration at interval of 100 micro-second. The range of the radar is
An oscillator is nothing but an amplifier with
In potential barrier development in a junction diode opposes
A CE amplifier has a voltage gain 50, an input impedance of 1000 ohm 1 and an output impedance of 200 ohm. The power gain of the amplifier will be
For the given circuit, the input digital signals are applied at terminals A, B, and C. What would be the output at terminal y?
Write the truth table for the circuit shown in figure. Name the gate that the circuit resembles.
An X-OR gate has following truth table:
| A | B | Y |
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
It is represented by following logic relation `Y = barA.B + A.barB`. Build this gate using AND, OR and NOT gates.
