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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 20
31.
Which one of the following type of negative feedback increases the input resistance and decreases the output resistance of an amplifier?
Current series feedback
Voltage series feedback
Current shunt feedback
Voltage shunt feedback
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
A load ZL = RL + jXL is to be matched using an ideal transformer to generator of internal impedance ZS = RS + jXS. The ratio of transformer required is __________ .
|ZS|/|ZL|
RL/RS
RL/ZS
|ZL|/RS
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
An AC source or RMS voltage 20V with internal impedance Zs = (1 + 2j) Ω feeds a load of impedance ZL = (7 + 4j) Ω in the figure below. The reactive power consumed by the load is
8 VAR
16 VAR
28 VAR
32 VAR
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
Electric dipole is located at origin in a medium with εr = 6, has a moment P = (4ax - 2ay + az ) nC. Then potential at (2, 4, 4) is:
0.062
0.027
0.042
0.072
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Voice signal band limited to 3.4 KHz is sampled and pulse code modulated using 64 quantization levels. Ten such signals are time division multiplexed using one 5-bit synchronizing word every alternate frame. The minimum channel bandwidth required for transmission of the TDM signal is
100 KHz
200 KHz
50 KHz
150 KHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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