Logic Gates

Q.

Why do we use a crystal oscillator?

Q.

What is XOR truth table?

Q. what is bulk modulus?

Q.

How many NAND gates are used to form an AND gate

1. 1

2. 2

3. 3

4. 4

Q.

Which of the following gates will have an output of 1

1. 

2. 

3. 

4. 

Q. The correct Boolean operation represented by the circuit diagram drawn is

1. AND
2. OR
3. NAND
4. NOR

Q.

The logic circuit below has the input waveforms A and B as shown. Pick out the correct output waveform.

1. 

2. 

3. 

4. 

Q.

Which represents NAND gate

1. 

2. 

3. 

4. 

Q. Logic gates control the flow of information.

1. False
2. True

Q. NOT gates are used to reverse the input signal.

1. False
2. True

Q. Figure shows a combination of logic gates. To what single gate is this combination equivalent?

1. $\text{XNOR}$
2. $\text{NOR}$
3. $\text{XOR}$
4. $\text{NOR}$

Q.

A gate has the following truth table

P 1 1 0 0

Q 1 0 1 0

R 1 0 0 0

The gate is

1. NOR

2. OR

3. NAND

4. AND

Q.

The truth table for system of four NAND gates as shown in the figure is

1. $\begin{array}{ccc}A& B& Y\\ 0& 0& 0\\ 0& 1& 0\\ 1& 0& 1\\ 1& 1& 1\end{array}$

2. $\begin{array}{ccc}A& B& Y\\ 0& 0& 1\\ 0& 1& 1\\ 1& 0& 0\\ 1& 1& 0\end{array}$

3. $\begin{array}{ccc}A& B& Y\\ 0& 0& 1\\ 0& 1& 0\\ 1& 0& 0\\ 1& 1& 1\end{array}$

4. $\begin{array}{ccc}A& B& Y\\ 0& 0& 0\\ 0& 1& 1\\ 1& 0& 1\\ 1& 1& 0\end{array}$

Q. Find the capacitance between $\text{P}$ and $\text{O}$, if each capacitor has capacitance $C$.

1. $3C$
2. $8C$
3. $2C$
4. $6C$

Q. 47. If x=Asin ω t Find its x-t graph

Q. In an OR gate, when one of the inputs is 1 then output is also 1.

1. True
2. False

Q. As the switch $S$ is closed in the circuit shown in figure, current passing through it will be

1. $8/25\text{A}$
2. $6.0\text{A}$
3. $25/8\text{A}$
4. $4.5\text{A}$

Q. The current $I$ in the given circuit is-

1. $\frac{1}{10}\text{A}$
2. $\frac{1}{45}\text{A}$
3. $\frac{1}{15}\text{A}$
4. $\frac{1}{5}\text{A}$