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Q. No.\(D_1,D_2\) are ideal diodes and the output \((V_{AB})\) of the transformer is \(10\) V (RMS). The current through the resistor is:
1. zero
2. \(20\) mA
3. \(40\) mA
4. \(20\sqrt2\) mA
Subtopic: Applications of PN junction |
Level 3: 35%-60%
Hints
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
1. AND
2. OR
3. XOR
4. none of the above
Subtopic: Logic gates |
Level 3: 35%-60%
Hints
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:
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 |
Level 3: 35%-60%
Hints
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 |
Level 3: 35%-60%
Hints
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%
Level 3: 35%-60%
Hints
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Which circuit element would make the best series filter to prevent high–frequency signals from passing through a bass speaker?
1. a capacitor
2. an inductor
3. a resistor
4. a transformer
1. a capacitor
2. an inductor
3. a resistor
4. a transformer
Subtopic: Rectifier |
Level 3: 35%-60%
Hints
Hole current in a semiconductor is due to the:
| 1. | movement of valence electrons |
| 2. | movement of conduction electrons |
| 3. | movement of positrons |
| 4. | movement of positive ions |
Subtopic: Types of Semiconductors |
51%
Level 3: 35%-60%
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The circuit shown in figure is given an input signal \(V_i,\) which varies with time and the corresponding output is \(V_o.\) Then,
| 1. | \(V_o=V_i+E\) |
| 2. | \(V_o=V_i-E\) |
| 3. | \(V_o=V_i,\) only when \(V_i>E\) |
| 4. | \(V_o=V_i,\) only when \(V_i<E\) |
Subtopic: PN junction |
Level 3: 35%-60%
Hints
The voltage \(V_{AB}=20~\text{V}\) at its peak value, and is sinusoidal in time. The current \(i\) (in amperes), when plotted as a function of time, is given by:
(consider the diodes as ideal.)
(consider the diodes as ideal.)
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: PN junction |
Level 3: 35%-60%
Hints
Assuming that the diodes \(D_1\) and \(D_2\) in the electric circuit are ideal, the value of the current flowing through the \(1~\Omega\) resistance is:
| 1. | \(\dfrac{2}{3}~\text{A}\) | 2. | \(2~\text{A}\) |
| 3. | \(1~\text{A}\) | 4. | \(\dfrac{1}{2}~\text{A}\) |
Subtopic: PN junction |
60%
Level 2: 60%+
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