Previous Year Questions
1 paper · 46 questions — organised by subject with solutions and explanations.
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In a voltage-voltage feedback as shown below, which one of the following statements is TRUE if the gain k is increased?
In the circuit shown below what is the output voltage if a silicon transistor Q and an ideal op-amp are used?
In the circuit shown below the op-amps are ideal. Then in Volts is
A voltage Volts is applied across YZ. Assuming ideal diodes, the voltage measured across WX in Volts, is
In the circuit shown below, the silicon npn transistor Q has a very high value of . The required value of in k to produce mA is
In the circuit shown below, the knee current of the ideal Zener diode is 10 mA. To maintain 5 V across , the minimum value of in and the minimum power rating of the Zener diode in mW, respectively, ar
The ac schematic of an NMOS common-source stage is shown in the figure below, where part of the biasing circuits has been omitted for simplicity. For the n -channel MOSFET M, the transconductance and
In a MOSFET operating in the saturation region, the channel length modulation effect causes
The small-signal resistance in offered by the n-channel MOSFET M shown in the figure below, at a bias point of is (device data for M: device transconductance parameter , threshold voltage , and neglec
The bit rate of a digital communication system is R kbits/s. The modulation used is 32-QAM. The minimum bandwidth required for ISI free transmission is
Let U and V be two independent and identically distributed random variables such that . The entropy H(U +V) in bits is
Let , and is a filter matched to . If is applied as input to , then the Fourier transform of the output is
Bits 1 and 0 are transmitted with equal probability. At the receiver, the pdf of the respective received signals for both bits are as shown below. The optimum threshold to achieve minimum bit error ra
Let and be two independent zero mean Gaussian random variables of variances and respectively. The probability is
Consider two identically distributed zero-mean random variables U and V. Let the cumulative distribution functions of U and 2V be and respectively. Then, for all values of
The state diagram of a system is shown below. A system is described by the state-variable equations ; The state transition matrix of the system shown in the figure above is
The signal flow graph for a system is given below. The transfer function for this system is
A system described by a linear, constant coefficient, ordinary, first order differential equation has an exact solution given by y(t) for t > 0, when the forcing function is x(t) and the initial condi
The Bode plot of a transfer function G(s) is shown in the figure below. The gain is 32 dB and -8 dB at 1 rad/s and 10 rad/s respectively. The phase is negative for all . Then G(s) is
The open-loop transfer function of a dc motor is given as . When connected in feedback as shown below, the approximate value of that will reduce the time constant of the closed loop system by one hund
In the circuit shown below, has negligible collector-to-emitter saturation voltage and the diode drops negligible voltage across it under forward bias. If is +5 V, X and Y are digital signals with 0 V
A bulb in a staircase has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned ON and also can be turned OFF by any one of the switches irres
The return loss of a device is found to be 20 dB. The voltage standing wave ratio (VSWR) and magnitude of reflection coefficient are respectively
A monochromatic plane wave of wavelength is propagating in the direction as shown in the figure below. , , and denote incident, reflected, and transmitted electric field vectors associated with the wa
For 8085 microprocessor, the following program is executed. MVI A, 05H; MVI B, 05H; PTR: ADD B; DCR B; JNZ PTR; ADI 03H; HLT; At the end of program, accumulator contains
There are four chips each of 1024 bytes connected to a 16 bit address bus as shown in the figure below. RAMs 1, 2, 3 and 4 respectively are mapped to addresses
The transfer function of the circuit shown below is
Consider the following figure The current in the resistor in Amps is
Three capacitors , and whose values are 10 F, 5 F, and 2 F respectively, have breakdown voltages of 10V, 5V, and 2V respectively. For the interconnection shown below, the maximum safe voltage in Volts
Two magnetically uncoupled inductive coils have Q factors and at the chosen operating frequency. Their respective resistances are and When connected in series, their effective Q factor at the same ope
In the circuit shown below, if the source voltage then the Thevenin?s equivalent voltage in Volts as seen by the load resistance is
The following arrangement consists of an ideal transformer and an attenuator which attenuates by a factor of 0.8. An ac voltage is applied across WX to get an open circuit voltage across YZ. Next, an
A source has an internal impedance of . If a purely resistive load connected to this source has to extract the maximum power out of the source, its value in should be
Consider a delta connection of resistors and its equivalent star connection as shown below. If all elements of the delta connection are scaled by a factor k, k>0, the elements of the corresponding sta
Consider the following figure The current in Amps in the voltage source, and voltage in Volts across the current source respectively, are
The impulse response of a system is . For an input u(t-1), the output is
Which one of the following statements is NOT TRUE for a continuous time causal and stable LTI system?
The DFT of a vector [a b c d] is the vector . Consider the product The DFT of the vector is a scaled version of
A band-limited signal with a maximum frequency of 5 kHz is to be sampled. According to the sampling theorem, the sampling frequency which is not valid is
For a periodic signal , the fundamental frequency in rad/s is
The impulse response of a continuous time system is given by . The value of the step response at t = 2 is
A system is described by the differential equation Let be a rectangular pulse given by Assuming that y(0) = 0 and at t = 0, the Laplace transform of y(t) is
Assuming zero initial condition, the response y(t) of the system given below to a unit step input u(t) is
Two systems with impulse responses and are connected in cascade. Then the overall impulse response of the cascaded system is given by