Electronics and Communication Engineering - Electronic Devices and Circuits

41. 

AE 139 is a

A. tunnel diode
B. germanium power transistor
C. photoconductive cell
D. silicon diode

Answer: Option B

Explanation:

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42. 

The function off an oxide layer in an IC device is to

  1. mask against diffusion or ion implantation
  2. insulate the surface electrically
  3. increase the melting point of Si
  4. produce a chemically stable protective layer

A. 1, 2, 3
B. 1, 3, 4
C. 2, 3, 4
D. 4, 1, 2

Answer: Option D

Explanation:

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43. 

The passage of current in an electrolyte is due to the movement of

A. electrons
B. molecules
C. atoms
D. ions

Answer: Option D

Explanation:

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44. 

In a CE bipolar transistor operating in active region, collector current is independent of

A. VCE
B. IB
C. both VCE and IB
D. none of the above

Answer: Option A

Explanation:

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45. 

When a normal atom loses an electron

A. the atom loses one-proton simultaneously
B. rest of the electrons move faster
C. the atom becomes a positive ion
D. the atom becomes a negative ion

Answer: Option C

Explanation:

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