Electronics and Communication Engineering - Analog Electronics

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1.
To prevent a DC return between source and load, it is necessary to use
resistor between source and load
inductor between source and load
capacitor between source and load
either (a) or (b)
Answer: Option
Explanation:

Capacitor offers infinite impedance to DC.


2.
For a base current of 10 μA, what is the value of collector current in common emitter if βdc = 100
10 μA
100 μA
1 mA
10 mA
Answer: Option
Explanation:

IC = 10 x 100 μA = 1 mA.


3.
Which of the following oscillators is suitable for frequencies in the range of mega hertz?
RC phase shift
Wien bridge
Hartley
Both (a) and (c)
Answer: Option
Explanation:

Only LC oscillators are suitable for MHz range.


4.
If the input to the ideal comparator shown in the figure is a sinusoidal signal of 8 V (peak to peak) without any DC component, then the output of the comparator has a duty cycle of
1/2
1/3
1/6
1/12
Answer: Option
Explanation:


5.
A half wave diode circuit using ideal diode has an input voltage 20 sin ωt volts. Then average and rms values of output voltage are
and 10 V
and 10 V
and 5 V
and 5 V
Answer: Option
Explanation:

and VC = 0.5 x 20 = 10 V.