Hot questions in Analog and Digital Electronics - GO Electrical

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GATE2015-2-32
For the switching converter shown in the following figure, assume steady-state operation. Also assume that the components are ideal, the inductor current is always positive and continuous and switching period is $T_{s}$. If the voltage $V_{L}$ is as shown, the duty cycle of the switch $S$ is ________.

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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2

GATE2015-1-40
An $8$-bit, unipolar Successive Approximation Register type ADC is used to convert $3.5$ V to digital equivalent output. The reference voltage is $+5$ V. The output of the ADC, at the end of 3rd clock pulse after the start of conversion, is 1010 0000 1000 0000 0000 0001 0000 0011

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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3

GATE2014-3-49
Two monoshot multivibrators, one positive edge triggered ($M_1$) and another negative edge triggered ($M_2$), are connected as shown in figure The monoshots $M_1$ and $M_2$ when triggered produce pulses of width $T_1$ and $T_2$ respectively, where $T_1$>$T_2$. The steady state output voltage $v_0$ of the circuit is

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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4

GATE2014-3-52
A hysteresis type $TTL$ inverter is used to realize an oscillator in the circuit shown in the figure. If the lower and upper trigger level voltages are $0.9$ $V$ and $1.7$ $V$, the period (in $ms$), for which output is $LOW$, is __________.

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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5

GATE2015-2-13
Consider the following Sum of Products expression, $F$. $F= ABC + \bar{A}\bar{B}C + A\bar{B}C + \bar{A}BC + \bar{A}\bar{B}\bar{C}$ The equivalent Product of Sums expression is $F= (A+\bar{B}+C) (\bar{A}+B+C) (\bar{A}+\bar{B}+C)$ $F= (A+\bar{B}+\bar{C}) (A+B+C) (\bar{A}+\bar{B}+\bar{C})$ $F= (\bar{A}+B+\bar{C}) (A+\bar{B}+\bar{C}) (A+B+C)$ $F= (\bar{A}+\bar{B}+C) (A+B+\bar{C}) (A+B+C)$

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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6

GATE2015-2-31
A buck converter feeding a variable resistive load is shown in the figure. The switching frequency of the switch $S$ is $100$ kHz and the duty ratio is $0.6$. The output voltage $V_{0}$ is $36$ V. Assume that all the components are ideal, and that the output voltage is ripple-free. The value of $R$ (in Ohm) that will make the inductor current ($i_{L}$) just continuous is _________.

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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7

GATE2015-1-14
In the given circuit, the silicon transistor has $\beta = 75$ and a collector voltage $V_{C} = 9V$. Then the ratio of $R_{B}$ and $R_{C}$ is _________.

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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8

GATE2013-14
The input impedance of the permanent magnet moving coil $(PMMC)$ voltmeter is infinite. Assuming that the diode shown in the figure below is ideal, the reading of the voltmeter in Volts is $4.46$ $3.15$ $2.23$ $0$

asked Feb 12, 2017 in Analog and Digital Electronics by piyag476 (1.5k points)

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9

GATE2013-18
A band-limited signal with a maximum frequency of $5\:kHz$ is to be sampled. According to the sampling theorem, the sampling frequency in $kHz$ which is not valid is $5$ $12$ $15$ $20$

asked Feb 12, 2017 in Analog and Digital Electronics by piyag476 (1.5k points)

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10

GATE2014-3-22
An operational-amplifier circuit is shown in the figure. $-(\frac{R_2}{R_1})v_i$ $-(1+\frac{R_2}{R_1})v_i$ $(1+\frac{R_2}{R_1})v_i$ +$V_{sat}$ or -$V_{sat}$

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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11

GATE2014-3-50
The transfer characteristic of the Op-amp circuit shown in figure is

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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12

GATE2014-2-21
Which of the following is an invalid state in an $8$-$4$-$2$-$1$ Binary Coded Decimal counter $1$ $0$ $0$ $0$ $1$ $0$ $0$ $1$ $0$ $0$ $1$ $1$ $1$ $1$ $0$ $0$

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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13

GATE2015-2-12
In the following circuit, the transistor is in active mode and $V_{C} = 2 V$. To get $V_{C} = 4 V$, we replace $R_{C}$ with $R′_{C}$. Then the ratio $R'_{C}$/ $R_{C}$ is _________.

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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14

GATE2015-2-14
The filters $F1$ and $F2$ having characteristics as shown in Figures $(a)$ and $(b)$ are connected as shown in Figure $(c)$. The cut-off frequencies of $F1$ and $F2$ are $f_{1}$ and $f_{2}$ respectively. If $f_{1} < f_{2}$, the resultant circuit exhibits the characteristic of a Band-pass filter Band-stop filter All pass filter High-Q filter

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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15

GATE2014-3-48
In the bridge circuit shown, the capacitors are loss free. At balance, the value of capacitance $C_1$ in microfarad is _________.

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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16

GATE2014-2-35
A $10$ $kHz$ even-symmetric square wave is passed through a bandpass filter with centre frequency at $30$ $kHz$ and $3$ $dB$ passband of $6$ $kHz$. The filter output is a highly attenuated square wave at $10$ $kHz$. nearly zero. a nearly perfect cosine wave at $30$ $kHz$ a nearly perfect sine wave at $30$ $kHz$.

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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17

GATE2015-1-33
The single-phase full-bridge voltage source inverter (VSI), shown in figure, has an output frequency of $50$ Hz. It uses unipolar pulse width modulation with switching frequency of $50$ kHz and modulation index of $0.7$ ... $R = 5 \Omega$, the amplitude of the fundamental component in the output voltage $V_{o}$ (in Volt) under steady-state is ________.

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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18

GATE2014-3-23
In $8085A$ microprocessor, the operation performed by the instruction $LHLD$ $2100_H$ is $(H)\leftarrow 21_H$ , $(L)\leftarrow 00_H$ $(H)\leftarrow M(2100_H)$ , $(L)\leftarrow M(2101_H)$ $(H)\leftarrow M(2101_H)$ , $(L)\leftarrow M(2100_H)$ $(L)\leftarrow 00_H$ , $(H)\leftarrow 21_H$

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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19

GATE2014-2-29
Assuming the diodes to be ideal in the figure, for the output to be clipped, the input voltage $v_i$ must be outside the range $-1$ $V$ to $-2$ $V$ $-2$ $V$ to $-4$ $V$ $+1$ $V$ to $-2$ $V$ $+2$ $V$ to $-4$ $V$

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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20

GATE2015-1-38
$f(A, B, C, D)$ = $\pi M(0,1,3,4,5,7,9,11,12,13,14,15)$ is a maxterm representation of a Boolean function $f (A, B, C, D)$ where $A$ is the $MSB$ and $D$ is the $LSB$. The equivalent minimized representation of this function is $(A +\bar{C}+D) (\bar{A}+B+D)$ ... $(B+\bar{C}+D) (A+\bar{B}+\bar{C}+D) (\bar{A}+B+C+D)$

asked Feb 12, 2017 in Analog and Digital Electronics by makhdoom ghaya (9.2k points)

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