Electronics and Communication Engineering - Electronic Devices and Circuits

1. 

The product kT (where k is Boltzmann's constant and T is absolute temperature) at room temperature is about

A. 0.051 eV
B. 0.026 eV
C. 0.01 eV
D. 0.001 eV

Answer: Option B

Explanation:

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2. 

If E is energy level of electron and EF is fermi level, and T = 0 and E > EF, then

A. the probability of finding an occupied quantum state of energy higher than EF is zero
B. all quantum states with energies greater than EF are occupied
C. some quantum states with energies greater than EF are occupied
D. majority of quantum states with energies greater than EF are occupied

Answer: Option A

Explanation:

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3. 

Which variety of copper has the best conductivity?

A. Pure annealed copper
B. Hard drawn copper
C. Induction hardened copper
D. Copper containing traces of silicon

Answer: Option A

Explanation:

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4. 

The number of valence electrons in a silicon atom is

A. 4
B. 2
C. 1
D. 0

Answer: Option A

Explanation:

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5. 

In a JFET VDS exceeds the rated value. Then it operates in

A. active region
B. ohmic region
C. cut off region
D. either cut off or active region

Answer: Option C

Explanation:

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