C, Si, and Ge have the same lattice structure. Why is the C insulator?

1. Because ionization energy for C is least in comparison to Si and Ge.

2. Because ionization energy for C is highest in comparison to Si and Ge.

3. The number of free electrons for conduction in Ge and Si is significant but negligibly small for C.

4. Both (2) and (3)

 

Subtopic:  Energy Band theory |
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Suppose a pure Si crystal has 5×1028 atoms m-3.  It is doped by a 1 ppm concentration of pentavalent As. The number of electrons and holes are, respectively: Given that ni=1.5×1016 m-3

1. 5×1022/m3, 4.5×109/m32. 4.5×109/m3, 5×1022/m33. 5×1022/m3, 5×1022/m34. 4.5×109/m3, 4.5×109/m3 

Subtopic:  Types of Semiconductors |
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Why can't we take one slab of p-type semiconductor and physically join it to another slab of n-type semiconductor to get a p-n junction?

1. The diffusion of majority charge carriers will not occur.

2. The junction will behave as a discontinuity for the flowing charge carriers.

3. The junction will behave as a continuity for the flowing charge carriers.

4. Both (1) and (2).

Subtopic:  PN junction |
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The V-I characteristic of a silicon diode is shown in the figure. The resistance of the diode at ID=15 mA is: 

1. 20 Ω2. 30 Ω3. 15 Ω4. 10 Ω

Subtopic:  PN junction |
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The V-I characteristic of a silicon diode is shown in the figure. The resistance of the diode at VD=-10 V is: 

1. 1×107 Ω2. 2×107 Ω3. 3×107 Ω4. 4×107 Ω

Subtopic:  PN junction |
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In a Zener regulated power supply, a Zener diode with VZ= 6.0 V is used for regulation. The load current is to be 4.0 mA and the unregulated input is 10.0 V. The value of the series resistor RS will be:Assume IZ=5IL

1. Less than 100 Ω2. Zero3.  Infinite4. 150 Ω

 

Subtopic:  Applications of PN junction |
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Which one of the following is not true for the photodiodes?

1. The current in the forward bias is more than the current in the reverse bias.

2. Photodiodes are preferably used in the reverse bias condition for measuring light intensity.

3. Photodiodes are preferably used in the forward bias condition for measuring light intensity.

4. In photodiodes, only a small portion of the incident photons gets converted to electric current.

Subtopic:  Applications of PN junction |
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Which material is preferred for solar cells?

1. Si

2. GaAs

3. CdS

4. Both Si and GaAs

Subtopic:  Applications of PN junction |
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The output characteristics of a transistor are shown in the figure. When VCE is 10 V and IC  = 4.0 mA, the value of βac is:

1. 200

2. 250

3. 150

4. 100

Subtopic:  Transistor |
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The output characteristics of a transistor are shown in the figure. When VCE is 10 V and IC  = 4.0 mA, the value of βdc is:

1. 200

2. 250

3. 300

4. 150

Subtopic:  Transistor |
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