# Home / ECE / Analog Electronics :: Section 1

### ECE :: Analog Electronics

1. To prevent a DC return between source and load, it is necessary to use

2.  A. resistor between source and load B. inductor between source and load C. capacitor between source and load D. either (a) or (b)   3. For a base current of 10 μA, what is the value of collector current in common emitter if βdc = 100

4.  A. 10 μA B. 100 μA C. 1 mA D. 10 mA   5. Which of the following oscillators is suitable for frequencies in the range of mega hertz?

6.  A. RC phase shift B. Wien bridge C. Hartley D. Both (a) and (c)   7. 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 8.  A. 1/2 B. 1/3 C. 1/6 D. 1/12   9. 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

10.  A. and 10 V B. and 10 V C. and 5 V D. and 5 V   11. An RC coupled amplifier has an open loop gain of 200 and a lower cutoff frequency of 50 Hz. If negative feedback with β = 0.1 is used, the lower cut off frequency will be   13. In figure v1 = 8 V and v2 = 4 V. Which diode will conduct? 14.  A. D2 only B. D1 only C. Both D1 and D2 D. Neither D1 nor D2   15. Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier shown below would be 16.  A. B. C. D.    17. If an amplifier with gain of - 1000 and feedback factor β = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be

18.  A. 10% B. 5% C. 0.2% D. 0.01%   19. In figure The minimum and maximum load currents are 20.  A. 0 and 60 mA B. 0 and 120 mA C. 10 mA and 60 mA D. 10 mA and 120 mA   