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Q. No.In which of the following circuits the diode is reverse-biased?
(i)
(ii)
(iii)
(iv)
1.
(ii)
2.
(i) and (iv)
3.
(iv)
4.
(i)
Subtopic: Β PN junction |
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Level 1: 80%+
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In the circuit shown below, a \(\mathrm{Si}\) diode and a \(\mathrm{Ge}\) diode are connected in series with resistors of \(2.5~\text{k}\Omega\) and \(2.5~\text{k}\Omega,\) across a \(15 ~\text V\) supply. If the forward voltage drops of the \(\mathrm{Si}\) and \(\mathrm{Ge}\) diodes are \(0.7 ~\text V\) and \(0.3 ~\text V,\) respectively, what is the potential difference across the \(2.5~\text{k}\Omega\) resistor?
| 1. | \(9.25~\text{V}\) | 2. | \(6.25~\text{V}\) |
| 3. | \(8.75~\text{V}\) | 4. | \(9.75~\text{V}\) |
Subtopic: Β PN junction |
Β 66%
Level 2: 60%+
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What is the current through the zener diode if its breakdown voltage is \(5~\text V?\)
1. \(58.33 ~\text{mA}\)
2. \(25 ~\text{mA}\)
3. \(28.33 ~\text{mA}\)
4. \(20.33 ~\text{mA}\)
1. \(58.33 ~\text{mA}\)
2. \(25 ~\text{mA}\)
3. \(28.33 ~\text{mA}\)
4. \(20.33 ~\text{mA}\)
Subtopic: Β Types of Semiconductors |
Β 63%
Level 2: 60%+
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In the voltage regulator circuit shown below, the reverse breakdown voltage of the Zener diode is \(3~\text{V}.\)Then the current through the Zener diode is:
1. \(7~\text{mA}\)
2. \(1.5~\text{mA}\)
3. \(5.5~\text{mA}\)
4. \(10~\text{mA}\)
1. \(7~\text{mA}\)
2. \(1.5~\text{mA}\)
3. \(5.5~\text{mA}\)
4. \(10~\text{mA}\)
Subtopic: Β Applications of PN junction |
Β 75%
Level 2: 60%+
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The truth table for the combination of logical gates
| 1. | \(A\) | \(B\) | \(C\) | 2. | \(A\) | \(B\) | \(C\) | |
| \(0\) | \(0\) | \(0\) | \(0\) | \(0\) | \(0\) | |||
| \(0\) | \(1\) | \(0\) | \(0\) | \(1\) | \(0\) | |||
| \(1\) | \(0\) | \(0\) | \(1\) | \(0\) | \(1\) | |||
| \(1\) | \(1\) | \(1\) | \(1\) | \(1\) | \(1\) | |||
| 3. | \(A\) | \(B\) | \(C\) | 4. | \(A\) | \(B\) | \(C\) | |
| \(0\) | \(0\) | \(0\) | \(0\) | \(0\) | \(0\) | |||
| \(0\) | \(1\) | \(1\) | \(0\) | \(1\) | \(1\) | |||
| \(1\) | \(0\) | \(0\) | \(1\) | \(0\) | \(0\) | |||
| \(1\) | \(1\) | \(1\) | \(1\) | \(1\) | \(0\) | |||
Subtopic: Β Logic gates |
Β 79%
Level 2: 60%+
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Which is the correct truth table for a given circuit?
| 1. | \(A\) | \(B\) | \(Z\) | 2. | \(A\) | \(B\) | \(Z\) | |
| \(0\) | \(0\) | \(1\) | \(0\) | \(0\) | \(0\) | |||
| \(0\) | \(1\) | \(1\) | \(0\) | \(1\) | \(1\) | |||
| \(1\) | \(0\) | \(1\) | \(1\) | \(0\) | \(1\) | |||
| \(1\) | \(1\) | \(0\) | \(1\) | \(1\) | \(0\) | |||
| 3. | \(A\) | \(B\) | \(Z\) | 4. | \(A\) | \(B\) | \(Z\) | |
| \(0\) | \(0\) | \(0\) | \(0\) | \(0\) | \(0\) | |||
| \(0\) | \(1\) | \(0\) | \(0\) | \(1\) | \(1\) | |||
| \(1\) | \(0\) | \(0\) | \(1\) | \(0\) | \(0\) | |||
| \(1\) | \(1\) | \(1\) | \(1\) | \(1\) | \(1\) | |||
Subtopic: Β Logic gates |
Β 75%
Level 2: 60%+
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In the voltage regulator circuit shown below, the reverse breakdown voltage of the Zener diode is \(5~\text{V}\) and power dissipated across it is \(100~\text{mW}.\) Then the value of unknown resistance \(R_S\) is:
1. \(43~\Omega\)
2. \(250~\Omega\)
3. \(1000~\Omega\)
4. \(1500~\Omega\)
1. \(43~\Omega\)
2. \(250~\Omega\)
3. \(1000~\Omega\)
4. \(1500~\Omega\)
Subtopic: Β Applications of PN junction |
Β 59%
Level 3: 35%-60%
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Subtopic: Β Logic gates |
Β 74%
Level 2: 60%+
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A \(\mathrm{p\text-n}\) junction diode \((A)\) of the potential barrier \(3.8 ~\text V\) is connected with the Zener diode \((B)\) of a potential barrier \(1.2 ~\text V\) as shown in the figure. The length \(PR\) is \(20 ~\text{cm},\) then the maximum value of \(PQ\) (in \(\text{cm}\)) for which there is no current flow through the diode is:
1. \(5\)
2. \(8\)
3. \(2\)
4. \(3\)
1. \(5\)
2. \(8\)
3. \(2\)
4. \(3\)
Subtopic: Β Applications of PN junction |
Β 53%
Level 3: 35%-60%
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Draw the truth table of the given circuit.
| 1. | \(A\) | \(B\) | \(X\) | 2. | \(A\) | \(B\) | \(X\) |
| \(0\) | \(0\) | \(0\) | \(0\) | \(0\) | \(0\) | ||
| \(0\) | \(1\) | \(0\) | \(0\) | \(1\) | \(0\) | ||
| \(1\) | \(0\) | \(0\) | \(1\) | \(0\) | \(0\) | ||
| \(1\) | \(1\) | \(1\) | \(1\) | \(1\) | \(0\) | ||
| 3. | \(A\) | \(B\) | \(X\) | 4. | \(A\) | \(B\) | \(X\) |
| \(0\) | \(0\) | \(1\) | \(0\) | \(0\) | \(1\) | ||
| \(0\) | \(1\) | \(0\) | \(0\) | \(1\) | \(0\) | ||
| \(1\) | \(0\) | \(0\) | \(1\) | \(0\) | \(0\) | ||
| \(1\) | \(1\) | \(0\) | \(1\) | \(1\) | \(1\) | ||
Subtopic: Β Logic gates |
Β 92%
Level 1: 80%+
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