Exercise: Exam Question Papers

Questions for: Exam Question Papers

Consider the following statements:
The bias stability of an emitter-bias amplifier circuit improves by
  1. decreasing the value of RB
  2. increasing the value of RE
  3. decreasing the value of RB
  4. increasing the value of RB
  5. increasing the value of RC
Which of the above statements are correct?
A:
1 and 2
B:
2 and 3
C:
3 and 4
D:
4 and 5
Answer: A
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Consider a random noise voltage which has a uniform density function as shown in the figure and is known to be white.

If the noise is the first quantized into 0.1 V steps, starting at 0 V level, and then readings made of 10 per second. The information content of the reading is :
A:
2 bits/reading
B:
5 bits/reading
C:
10 bits/reading
D:
none of these
Answer: B
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A system described by the transfer function is stable. The constraints on a and K are
A:
a > 0, ak < 3
B:
a > 0, ak > 3
C:
a < 0, ak > 3
D:
a < 0, ak < 3
Answer: B
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If D, G and η denote the directly, power gain and efficiency of an antenna, then which of the following relation holds :
A:
DGη = 1
B:
η = DG
C:
D = ηG
D:
D = G/η
Answer: D
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Which of the following devices is a 'hot-electron' diode?
A:
Thermionic tube diode
B:
Schottky-Barrier diode
C:
Thomson-Deletion diode
D:
Thermal electron diode
Answer: B
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