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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 7
16.
For an ideal noise free transistor amplifier the noise factor is
zero
zero dB
1 dB
depends on other factors
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
In a crystal
the frequencies of series and parallel resonance are equal
the frequency of series resonance is more than frequency of parallel resonance
the frequency of parallel resonance is more than frequency of series resonance
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Voltage VL in the circuit when Vs < 0 where D is an ideal diode. (Take R1 = Rs = RL = 1 Ω)
0
1
1.5
cannot find
Answer: Option
Explanation:

if Vs ≥ 0, then id ≥ 0

if Vs < 0 then id < 0, Diode D is replaced by and open ckt and id = 0, hence VL = id . RL = 0.

19.
Ultra high frequency oscillators work in the range
20 Hz to 20 kHz
1 kHz to 30 kHz
30 kHz to 30 MHz
above 30 MHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
N-channel FETs are superior to p-channel FETs because
mobility of electrons is smaller than that of holes
mobility of electrons is greater than that of holes
they consume less power
they have high switching time
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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