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GATE EC 2020 National Champion Quiz: Analog Electronics (App update required to attempt this test)

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Question 1

Consider the oscillator circuit shown in the figure. The function of the network (shown in dotted lines) consisting of the resistor in series with the two diodes connected back-to-back is to:

Question 2

In the circuit shown below, the Zener voltage VZA=VZB = 6 V, assume ideal diodes and forward cut in voltage is 0. Vo is output voltage then

Question 3

Two n-channel MOSFETs, T1 and T2, are identical in all respects except that the width of T2 is double that of T1. Both the transistors are biased in the saturation region of operation, but the gate overdrive voltage (VGS-VTH) of T2 is double that of T1, where VGS and VTH are the gate – to – source voltage and threshold voltage of the transistors, respectively. If the drain current and transconductance of T1 are ID1 and gm1 respectively, the corresponding values of these two parameters for T2 are

Question 4

An amplifier in open loop has an amplification gain of -100.If the amplifier is used with feedback and 5% part of the output is given back to the negative feedback circuit. Then the overall gain of the feedback circuit is____

Question 5

In the circuit shown, Vs is a square wave of period T with maximum and minimum values of 8 V and -10 V, respectively. Assume that the diode is ideal and R1 = R2 = 50 Ω.

The average value of VL is _________ volts (rounded off to 1 decimal place).

Question 6

Calculate the drain current (in mA) for an n-channel E-MOSFET which has a conduction parameter of 50mA/V2 and a threshold voltage of 2V. If the supply voltage is 15V and the load resistor is 100 Ohms.

Question 7

Two transistors having very large β are connected as shown in figure below. Assume that

The output voltage V0 (in Volt) is _____.

Question 8

The waveform of output voltage V0 starting from t = t1 for the given circuit is (Assume diode D to be ideal)

Question 9

If op-amp in the below circuit is ideal, then find the hysteresis width (in V) of the non-inverting Schmitt trigger that shown below

Question 10

For the CE amplifier shown, calculate value of lower cutoff frequency  (in Hz) due to

Question 11

The cut off frequency of a second order high pass filter, as shown in figure for R1 = 1.1 kΩ, R2 = 2.1 kΩ, C1 = 0.1 μF, C2 = 0.05 μF and RG = 10 kΩ, RF = 50 kΩ is

Question 12

Consider the transistor circuit of figure, where Vcc=22.5 V , Rc=5.6 kΩ , RE=10 kΩ , R2=10 kΩ , R1=90 kΩ , β=55 , VBE=0.6 V . The transistor operates in the active region. Determine the operating point of the transistor (VCEQ,ICQ) and the stability factor(S).
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Jul 17ESE & GATE EC