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# AE_EC1405_EVENSEM_2011_MidSemesterQuestions

Module by: Bijay_Kumar Sharma. E-mail the author

Summary: MidSemester Question Paper of Even Semester_2011 in the subject Analog Electronics.

MIDSEMESTER TEST

EC1405_Analog Electronics_IT & CSE Fourth Semester.

Time: 2 hours Total Marks:18 points

Question 1 is compulsory and any two of the remaining three questions.

Question 1.

• Give the spectrum slot allotted for AM_Medium Wave-AIR local transmission, for AM_Short Wave_Global Transmission, for Doordarshan Transmission for Channel 2 to 6 and for FM Radio transmission by AIR.
• Describe Amplitude Distortion also known as Harmonic Distortion. Give an example of Amplitude Distortion.
• Describe Frequency Distortion and an application where Frequency Distortion occurs.
• Describe the different schemes of Biasing and which schemes are preferred in actual circuits.
• Draw the Frequency Domain Response and Time Domain response of Emitter Degenerate Amplifier at 100Hz and at 10kHz.
• How does a HPF(High Pass Filter) behave at very low frequencies where time period of repetition of input square wave is much larger than the Time Constant of HPF.
• How does a LPF(Low Pass Filter) behave at very high frequencies where time period of repetition of input square wave is much smallerthan the Time Constant of LPF.
• What is the CRO display under Component Testing mode for resistance R which is high, low, open circuit and short circuit.

Question 2.

• Identify the amplifier.
• If ICQ= 1mA, VCEQ = 5V then write down the incremental parameters of the BJT either for its h-model or for its Hybrid-pi Model.
• Draw the DC and AC load line on the I-V family of curves of Q BC548 and mark the Q point.
• Using the load line draw the output curve if the input voltage is

vS = 1VSin(ωt).

Question 3.

If a Low Pass Filter has R = 10k and C = 1µF then calculate its cutoff frequency.

1. What is the frequency response BODE PLOT of the magnitude of the transfer function H(jω) of LPF ?
2. What is the Time Domain Response of LPF for:
1. T of the square wave >> τ (time constant) of LPF;
2. T of the square wave ≈ τ (time constant) of LPF;
3. T of the square wave << τ (time constant) of LPF;

(Assume that input square wave is of 10V amplitude and it is offsetted by 5V).

Question 4.

• Identify the amplifier.
• If ICQ= 1mA, VCEQ = 5V then write down the incremental parameters of the BJT either for its h-model or for its Hybrid-pi Model.
• Draw the DC and AC load line on the I-V family of curves of Q BC548 and mark the Q point.
• Using the load line draw the output curve if the input voltage is

vS = 5mVSin(ωt).

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