Q1. Choose the correct answer for the following: ( 1. When the stopband of a BSF is 5 kHz and the cut-off frequency of the HPF in the parallel circuit is 20 kHz, the cut-off of the LPF is approximately: a) 15 kHz b) 20 kHz c) 30 kHz d) 35 kHz 2. If the carrier frequency received by AM receiver is 1.2 MHz, the local oscillator should be set on one of the following frequencies: a) 1.2 MHz b) 455 kHz c) 2.4 MHz d) 1,655 MHz 3. Image frequencies in AM superheterodyne receivers are removed by: a) Low pass filter b) Band pass filters c) The IF stage d) The mixer in class C amplifier

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Q1. Choose the correct answer for the following: (
1. When the stopband of a BSF is 5 kHz and the cut-off frequency of the HPF in the parallel
circuit is 20 kHz, the cut-off of the LPF is approximately:
3) 15 kHz
b) 20 kHz
c) 30 kHz
d) 35 kHz
2. If the carrier frequency received by AM receiver is 1.2 MHz, the local oscillator should be
set on one of the following frequencies:
a) 1.2 MHz
b) 455 kHz
c) 2.4 MHz
d) 1,655 MHz
3. Image frequencies in AM superheterodyne receivers are removed by:
a) Low pass filter
b) Band pass filters
c) The IF stage
d) The mixer
4. If the frequency of the input signal is 500 kHz, and the transistor in class C amplifier
conducts for 5% of the cycle time, the conduction time is
a) 2 µs
b) 0.2 µs
c) 5 µs
d) 0.5 µs
5. A carrier signal of 0.5 MHz is AM modulated by another signal of 10 kHz, the outputs of the
balanced modulator are the following frequencies:
a) 410 kHz, 510 kHz
b) 490 kHz, 510 kHz, 500 kHz
c) 490 kHz, 510 kHz
d) 0.5 MHz, 0.51 MHz, 0.48 MHz
6. In class C amplifier, if the power supply is 12 V and the tank circuit has a resistance of 80 ,
the maximum output power is
a) 1.44 W
b) 1.44 mW
c) 900 mW
d) 288 mW
Transcribed Image Text:Q1. Choose the correct answer for the following: ( 1. When the stopband of a BSF is 5 kHz and the cut-off frequency of the HPF in the parallel circuit is 20 kHz, the cut-off of the LPF is approximately: 3) 15 kHz b) 20 kHz c) 30 kHz d) 35 kHz 2. If the carrier frequency received by AM receiver is 1.2 MHz, the local oscillator should be set on one of the following frequencies: a) 1.2 MHz b) 455 kHz c) 2.4 MHz d) 1,655 MHz 3. Image frequencies in AM superheterodyne receivers are removed by: a) Low pass filter b) Band pass filters c) The IF stage d) The mixer 4. If the frequency of the input signal is 500 kHz, and the transistor in class C amplifier conducts for 5% of the cycle time, the conduction time is a) 2 µs b) 0.2 µs c) 5 µs d) 0.5 µs 5. A carrier signal of 0.5 MHz is AM modulated by another signal of 10 kHz, the outputs of the balanced modulator are the following frequencies: a) 410 kHz, 510 kHz b) 490 kHz, 510 kHz, 500 kHz c) 490 kHz, 510 kHz d) 0.5 MHz, 0.51 MHz, 0.48 MHz 6. In class C amplifier, if the power supply is 12 V and the tank circuit has a resistance of 80 , the maximum output power is a) 1.44 W b) 1.44 mW c) 900 mW d) 288 mW
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