In an n-type silicon, which of the following statement is true:

(1) Electrons are majority carriers and trivalent atoms are the dopants.

(2) Electrons are minority carriers and pentavalent atoms are the dopants.

(3) Holes are minority carriers and pentavalent atoms are the dopants.

(4) Holes are majority carriers and trivalent atoms are the dopants.

Subtopic:  Types of Semiconductors |
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Carbon, silicon, and germanium have four valence electrons each. These are characterized by valence and conduction bands separated by the energy bandgap respectively equal to (Eg)C, (Eg)Si, and (Eg)Ge. Which of the following statements is true?

1. (Eg)Si < (Eg)Ge < (Eg)C

2. (Eg)C < (Eg)Ge > (Eg)Si

3. (Eg)C > (Eg)Si > (Eg)Ge

4. (Eg)C = (Eg)Si = (Eg)Ge 

Subtopic:  Energy Band theory |
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In an unbiased p-n junction, holes diffuse from the p-region to n-region because

(1) free electrons in the n-region attract them.

(2) they move across the junction by the potential difference.

(3) hole concentration in p-region is more as compared to n-region.

(4) All the above.

Subtopic:  Types of Semiconductors |
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When a forward bias is applied to a p-n junction, it

(1) raises the potential barrier.

(2) reduces the majority carrier current to zero.

(3) lowers the potential barrier.

(4) None of the above.

Subtopic:  PN junction |
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For transistor action, which of the following statements is correct:

(1) Base, emitter, and collector regions should have similar size and doping concentrations.

(2) The base region must be very thin and lightly doped.

(3)  Both the emitter junction as well as the collector junction are forward biased.

(4) None of the above.

Subtopic:  Applications of Transistor |
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For a transistor amplifier, the voltage gain:

1. remains constant for all frequencies.
2. is high at high and low frequencies and constant in the middle-frequency range.
3. is low at high and low frequencies and constant at mid frequencies.
4. none of the above.
Subtopic:  Applications of Transistor |
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In a half-wave rectification, what is the output frequency if the input frequency is 50 Hz?

1. 50 Hz

2. 100 Hz

3. 25 Hz

4. 60 Hz

Subtopic:  Rectifier |
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For a CE-transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 2 V. Suppose the current amplification factor of the transistor is 100, what is the base current if the base resistance is 1 kΩ?

1  14 μA2 12 μA3 15 μA4 10 μA

Subtopic:  Transistor |
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Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 10 and the second has a voltage gain of 20. If the input signal is 0. 01 volt, the output ac signal is:

(1) 1.0 V

(2) 2.4 V

(3) 2 V

(4) 1.5 V

Subtopic:  Applications of Transistor |
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A p-n photodiode is fabricated from a semiconductor with a bandgap of 2.8 eV. The energy of the incident photon with a waveength of 6000 nm is:

(1) 0.207 eV

(2) 0.270 eV

(3) 0.027 eV

(4) 0.072 eV

Subtopic:  PN junction |
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