Previous Year Questions
76 questions — organised by subject with solutions and explanations.
🎯 Practice smarter, not harder
Just sign in to unlock everything. Free for all students.
Given Transconductance in milli-Siemens (mS) and voltage gain of the amplifier are respectively
The voltage is indicated in the figure has been measured by an ideal voltmeter. Which of the following can be calculated ?
The cascade amplifier is a multistage configuration of
The effect of current shunt feedback in an amplifier is to
For an n-channel MOSFET and its transfer curve shown in the figure, the threshold voltage is
The circuit using a BJT with = 50 and VBE = 0.7V is shown in the figure. The base current and collector voltage by respectively
The Zener diode in the regulator circuit shown in the figure has a Zener voltage of 5.8 volts and a zener knee current of 0.5 mA. The maximum load current drawn from this current ensuring proper funct
Given of the circuit are respectively
The input resistance of the amplifier shown in the figure is
The Op-amp circuit shown in the figure is filter. The type of filter and its cut. Off frequency are respectively
Given under DC conditions are respectively
In an ideal differential amplifier shown in the figure, a large value of .
For an npn transistor connected as shown in figure =0.7 volts. Given that reverse saturation current of the junction at room temperature K is A, the emitter current is
Given the ideal operational amplifier circuit shown in the figure indicate the correct transfer characteristics assuming ideal diodes with zero cut-in voltage.
Find the correct match between group 1 and group 2.
A signal as shown in the figure is applied to a matched filter. Which of the following does represent the output of this matched filter ?
Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth ?
A carrier is phase modulated (PM) with frequency deviation of 10 kHz by a single tone frequency of 1 kHz. If the single tone frequency is increased to 2 kHz, assuming that phase deviation remains unch
A symmetric three-level midtread quantizer is to be designed assuming equiprobable occurrence of all quantization levels. The quantization noise power for the quantization region between -a and +a in
A device with input x(t) and output y(t) is characterized by: . An FM signal with frequency deviation of 90kHz and modulating signal bandwidth of 5kHz is applied to this device. The bandwidth of the o
An output of a communication channel is a random variable v with the probability density function as shown in the figure. The mean square value of is
Noise with uniform power spectral density of W/Hz is passed though a filter followed by an ideal pass filter of bandwidth B Hz. The output noise power in Watts is
A linear system is equivalently represented by two sets of state equations : The eigenvalues of the representations are also computed as and . Which one of the following statements is true ?
Which one of the following polar diagrams corresponds to a lag network ?
In the derivation of expression for peak percent overshoot, % Which one of the following conditions is NOT required ?
An unity feedback system is given as Indicate the correct root locus diagram.
The open loop transfer function of a unity feedback is given by . The gain and phase margins of the system will be
A ramp input applied to an unity feedback system results in 5% steady state error. The type number and zero frequency gain of the system are respectively
Despite the presence of negative feedback, control systems still have problems of instability because the
A double integrator plant G(s) = K/ , H(s) = 1 is to be compensated to achieve the damping ratio =0.5, and an undamped natural frequency, =5 rad/sec. Which one of the following compensator will be sui
The polar diagram of a conditionally stable system for open loop gain K = 1 is shown in the figure. The open loop transfer function of the system is known to be stable. The closed loop system is stabl
The given figure shows a ripple counter using positive edge triggered flip-flops. If the present state of the counter is = 011 then is next state will be
The Boolean function f implemented in the figure using two input multiplexes is
Decimal 43 in Hexadecimal and BCD number system is respectively
The transistors used in a portion of the TTL gate show in the figure have = 100. The base emitter voltage of is 0.7 V for a transistor in active region and 0.75 V for a transistor in saturation. If th
Both transistors and show in the figure, have a threshold voltage of 1 Volts. The device parameters and of and are, respectively, 36 and 9 . The output voltage Vo is
The Boolean expression for the truth table shown is
The present output of an edge triggered JK flip-flop is logic 0. If J = 1, then
Voltage standing wave pattern in a lossless transmission line with characteristic impedance 50 and a resistive load is shown in figure. The reflection coefficient is given by
Characteristic impedance of a transmission line is 50 . Input impedance of the open-circuited line . when the transmission line a short circuited, then value of the input impedance will be.
Which one of the following does represent the electric field lines for the mode in the cross-section of a hollow rectangular metallic waveguide ?
The magnetic field intensity vector of a plane wave is given by where , denotes the unit vector in y direction. The wave is propagating with a phase velocity.
Many circles are drawn in a Smith Chart used for transmission line calculations. The circles shown in the figure represent
Refractive index of glass is 1.5. Find the wavelength of a beam of light with frequency of Hz in glass. Assume velocity of light is 3 m/s in vacuum
A MOS capacitor made using p type substrate is in the accumulation mode. The dominant charge in the channel is due to the presence of
A Silicon PN junction diode under reverse bias has depletion region of width m. The relative permittivity of Silicon, = 11.7 and the permittivity of free space . The depletion capacitance of the diode
The primary reason for the widespread use of Silicon in semiconductor device technology is
A Silicon PN junction at a temperature of C has a reverse saturation current of 10 pico-Ameres (pA). The reserve saturation current at C for the same bias is approximately
A Silicon sample A is doped with atoms/ of boron. Another sample B of identical dimension is doped with atoms/ phosphorus. The ratio of electron to hole mobility is 3. The ratio of conductivity of the
The bandgap of Silicon at room temperature is
Consider an 8085-microprocessor system. The following program starts at location 0100H. LXI SP, OOFF LXI H, 0701 MVI A, 20H SUB M If in addition following code exists from 019H onwards. ORI 40 H ADD M
What memory address range is NOT represents by chip # 1 and chip # 2 in the figure? in this figure are the address lines and CS means chip select.
The maximum power that can be transferred to the load resistor from the voltage source in the figure is
The first and the last critical frequency of an RC-driving point impedance function must respectively be
The condition on R, L and C such that the step response y(t) in the figure has no oscillations, is
For the circuit shown in the figure, the instantaneous current (t) is
In a series RLC circuit, R=2k , L=1H, and The resonant frequency is
For the circuit shown in the figure, Thevenin's voltage and Thevenin's equivalent resistance at terminals a-b is
A square pulse of 3 volts amplitude is applied to C-R circuit shown in the figure. The capacitor is initially uncharged. The output voltage at time t=2 sec is
The h parameters of the circuit shown in the figure are
Impedance Z as shown in the given figure is
If and in the bridge circuit shown in the figure, then the reading in the ideal voltmeter connected between a and b is
The ABCD parameters of an ideal n:1 transformer shown in the figure are The value of x will be
Which of the following can be impulse response of a causal system ?
A sequence x(n) has non-zero values as shown in figure. The Fourier transform of y(2n) will be
A signal is the input to a linear time- invariant system having a frequency response H( ). If the output of the system Ax(n - ) then the most general form of will be
The function x(t) is shown in the figure. Even and odd parts of a unit step function u(t) are respectively,
In what range should Re(s) remain so that the Laplace transform of the function exits.
The region of convergence of z-transform of the sequence must be
For a signal x(t) the Fourier transform is X(f). Then the inverse Fourier transform of X(3f + 2) is given by
The output y(t) of a linear time invariant system is related to its input x(t) by the following equations: The filter transfer function H( ) of such a system is given by
A sequence x(n) has non-zero values as shown in figure. The sequence will be
Let and be the Fourier transform of y(n) then Y
The power in the signal is
Match the following and choose the correct combination. Group 1 E. Continuous and aperiodic signal F. Continuous and periodic signal G. Discrete and aperiodic signal H. Discrete and periodic signal Gr
Choose the function for which a Fourier series cannot be defined.