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Electronics and Communication Engineering - Analog Electronics

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Home » Engineering » Electronics and Communication Engineering » Analog Electronics » Section 1

Exercise :: Analog Electronics - Section 1

1. 

To prevent a DC return between source and load, it is necessary to use
A. resistor between source and load
B. inductor between source and load
C. capacitor between source and load
D. either (a) or (b)

Answer: Option C

Explanation:

Capacitor offers infinite impedance to DC.

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2. 

For a base current of 10 μA, what is the value of collector current in common emitter if βdc = 100
A. 10 μA
B. 100 μA
C. 1 mA
D. 10 mA

Answer: Option C

Explanation:

IC = 10 x 100 μA = 1 mA.

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3. 

Which of the following oscillators is suitable for frequencies in the range of mega hertz?
A. RC phase shift
B. Wien bridge
C. Hartley
D. Both (a) and (c)

Answer: Option C

Explanation:

Only LC oscillators are suitable for MHz range.

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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
A. 1/2
B. 1/3
C. 1/6
D. 1/12

Answer: Option B

Explanation:

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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
A. and 10 V
B. and 10 V
C. and 5 V
D. and 5 V

Answer: Option B

Explanation:

and VC = 0.5 x 20 = 10 V.

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