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What does the following logic circuit represent?
1. AND 2. OR
3. NOR 4. XOR

Subtopic:  Logic gates |
 69%
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For the above circuit, the applied voltage \(V(t)\) is periodic and linear, and is shown by the waveform below:
    
The current flowing through \(R_2\) varies as:
1. 2.
3. 4.
Subtopic:  PN junction |
 57%
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If an AND-gate and an OR-gate are OR-ed together, the resulting gate is:
1. AND
2. OR
3. XOR
4. none of the above
Subtopic:  Logic gates |
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The system of gates shown in the adjacent diagram represents

1. AND gate
2. OR gate
3. XOR gate
4. null gate (always zero)
Subtopic:  Logic gates |
 71%
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The input to a Zener diode circuit is an AC-voltage along with a DC:    \(V_i=(20~\text V)\sin\omega t+(20~\text V)~\)
Current flows through the diode:
                      
1. continuously, in both directions
2. continuously, only in one direction
3. intermittently, in both directions
4. intermittently, only in one direction
Subtopic:  Applications of PN junction |
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The voltage across \(AB\) i.e., \(V_{AB}\) is varied from \(0\) V to \(12\) V. The current through branch \(XY~(i)\) is measured. Then:
                  
1. \(i=0.05\) A if \(V_{AB}\geq10\) V and \(i=\dfrac{V_{AB}}{200~\Omega}\) otherwise
2. \(i=0.05\) A if \(V_{AB}\leq10\) V and \(i=\dfrac{V_{AB}}{200~\Omega}\) otherwise
3. \(i=0.05\) A
4. \(i=\dfrac{V_{AB}}{200~\Omega}\)
Subtopic:  Applications of PN junction |
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Consider the circuit shown in the above diagram. The output \((Y)\) of the circuit does not depend on \(A.\) Then, \(Y=\)
                         
1. \(B\) AND \(C\)
2. \(B\) OR \(C\)
3. \(B\)
4. \(C\)
Subtopic:  Logic gates |
 68%
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In the circuit shown in the figure, \(V_A>V_B.\) Which of the diodes conduct?
            
1. only \(D_3\) 2. \(D_1\) and \(D_3\)
3. all of the diodes 4. none of the diodes
Subtopic:  PN junction |
 53%
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The output \((Y)\) of the logic circuit given above is:
             
1. \(A\) AND \(C\)
2. \(A\) OR \(C\)
3. always TRUE
4. always FALSE
Subtopic:  Logic gates |
 59%
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The voltage drop across a silicon diode \((D)\) which is in forward bias and conducting a small current is approximately \(0.7\) V. Which of the following sources will deliver a voltage of \(3\) V?
1.    2.
3. 4.
Subtopic:  PN junction |
 60%
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