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Q. No.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: Â PN junction |
 53%
Level 3: 35%-60%
Hints
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: Â Rectifier |
Level 3: 35%-60%
Hints
Specify which of the following type of material might satisfy these descriptions:
A half-filled valence band, an empty conduction band, and an energy gap of \(1\) eV.
A half-filled valence band, an empty conduction band, and an energy gap of \(1\) eV.
| 1. | conductor |
| 2. | insulator |
| 3. | semiconductor |
| 4. | none of the above |
Subtopic: Â Energy Band theory |
 77%
Level 2: 60%+
Hints
To make ordinary silicon into a \(\mathrm{p\text-}\)type semiconductor, you might add to it:
| 1. | Indium | 2. | Antimony |
| 3. | Germanium | 4. | Carbon |
Subtopic: Â Types of Semiconductors |
 82%
Level 1: 80%+
Hints
In a forward-biased \(\mathrm{p\text-n}\) junction diode, the potential barrier in the depletion region is of the form of:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â PN junction |
 68%
Level 2: 60%+
Hints
The electrical circuit used to get smooth DC output from a rectifier circuit is called:
1. logic gate
2. amplifier
3. filter
4. oscillator
1. logic gate
2. amplifier
3. filter
4. oscillator
Subtopic: Â Rectifier |
 66%
Level 2: 60%+
Hints
A full wave rectifier circuit along with the input and output voltages is shown in the figure. The contribution to the output voltage from diode-\(2\) is:
| 1. | \(A,C\) | 2. | \(B,D\) |
| 3. | \(B,C\) | 4. | \(A,D\) |
Subtopic: Â Rectifier |
 82%
Level 1: 80%+
Hints
What is responsible for the formation of the depletion layer across the \(\mathrm{p\text-n}\) junction?
| 1. | Drift of holes. |
| 2. | Drift of electrons. |
| 3. | Diffusion of holes and electrons. |
| 4. | Absence of diffusion of holes and electrons. |
Subtopic: Â PN junction |
 83%
Level 1: 80%+
Hints
The charge on a \(\mathrm{p}\)-type semiconductor is:
| 1. | neutral |
| 2. | negative |
| 3. | positive |
| 4. | may be positive or negative |
Subtopic: Â Types of Semiconductors |
 74%
Level 2: 60%+
Hints
The energy band gap of semiconducting material to produce violet (wavelength \(=4000~\mathring{A}\)) LED is (nearly):
1. \(3~\text{eV}\)
2. \(5~\text{eV}\)
3. \(1~\text{eV}\)
4. \(7~\text{eV}\)
1. \(3~\text{eV}\)
2. \(5~\text{eV}\)
3. \(1~\text{eV}\)
4. \(7~\text{eV}\)
Subtopic: Â Energy Band theory |
 86%
Level 1: 80%+
Hints
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