Q. No.The device that can act as a complete electronic circuit is:
1. Junction diode
2. Integrated circuit
3. Junction transistor
4. Zener diode
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A common emitter amplifier has a voltage gain of 50, an input impedance of 100 Ω and an output impedance of 200 Ω. The power gain of the amplifier is:
1. 500
2. 1000
3. 1250
4. 50
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2. 4000 nm
3. 6000 nm
4. 4000 Å
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A p-n photodiode is made of a material with a bandgap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly:
1.
2.
3.
4.
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In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table:
1. A B Y
0 0 0
0 1 0
1 0 0
1 1 1
2. A B Y
0 0 1
0 1 1
1 0 1
1 1 0
3. A B Y
0 0 1
0 1 0
1 0 0
1 1 1
4. A B Y
0 0 0
0 1 1
1 0 1
1 1 1
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In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an:
| 1. | \(\mathrm{p}\text-\)type semiconductor |
| 2. | insulator |
| 3. | metal |
| 4. | \(\mathrm{n}\text-\)type semiconductor |
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A transistor-oscillator using a resonant circuit with an inductance \(L\) (of negligible resistance) and a capacitance \(C\) has a frequency \(f\). If \(L\) is doubled and \(C\) is changed to \(4C\), the frequency will be:
1. \(\frac{f}{4}\)
2. \(8f\)
3. \(\frac{f}{2\sqrt{2}}\)
4. \(\frac{f}{2}\)
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A transistor is operated in common emitter configuration at constant collector voltage Vc = 1.5 V such that a change in the base current from 100 μA to 150 μA produces a change in the collector current from 5 mA to 10 mA. The current gain (β) is:
1. 67
2. 75
3. 100
4. 50
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The photoelectric effect is used by a photocell to convert:
| 1. | Change in the frequency of light into a change in electric voltage. |
| 2. | Change in the intensity of illumination into a change in photoelectric current. |
| 3. | Change in the intensity of illumination into a change in the work function of the photocathode. |
| 4. | Change in the frequency of light into a change in the electric current. |
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