The circuit shown in figure is a
ISRO Scientist or Engineer Electronics 2008
For the following questions answer them individually
In the op-amp circuit given in figure, the load current $$i_L$$ is
An op-amp has an offset voltage of 1 mV and is ideal in all other respects. If this op-amp is used in the circuit shown in figure, the output voltage will be
For the circuit shown above if $$g_m = 3 \times 10^{-3}$$ and $$R_s = 3000 Ω$$, thenn the approximate value of $$R_o$$ is
Where does the operating point of a class-B power amplifier lie?
The Laplace transform of $$e^{-2t}$$ is
The system with characteristic equation $$s^4 + 3s^3 + 6s^2 + 9s + 12 = 0$$
Compared to field effect photo transistors, bipolar photo transistors are
The output VI characteristics of an enhancement type MOSFET has
Which of the following relation is valid?
Where MTBF = Mean Time Between Failures
MITTF = Mean Time To Failures
MTTR = Mean Time To Repair
Two transistors have the same value of $$\alpha$$ but different gain bandwidth products. One of them is a germanium transistor and the otheris a silicon transistor. Both the transistors have similar geometries and base width. The transistor with lower GB product
The following transistor configuration has the highest input impedance
If $$t_c$$, h and $$t_m$$ specify the cache access time, hit ratio and main memory access time then the average access time is (given $$t_c = 160 ns, t_m = 960 ns, h = 0.90$$)
The advantage of write (copy) back data cache organization over write through organization is
$$E^2PROM$$ storage element is
The modulus of $$1 + \cos \alpha + i \sin \alpha$$ is
The 8 bit DAC produces 1.0 V fora digital input of 00110010. Whatis the largest outputit can produce?
The fastest ADC amongthe following is
The mod numberof a Johnson counterwill be alwaysequalto...... the numberofflip flops used
Odd parity generator uses ............ logic
Which type of memory has fast erase and write times
The performancegain that can be obtained by improving someportion of a computer can be calculated using
Micro programming refers to
An array processor is a ........ machine
............... machines tend to make useofinternal resources of the processor, a rich set of registers and a pipelined organization.
Difference between a switch and Hub
100 Base T refers to
A S-R flip flop with a clock input can be converted to a ‘D’ flip flop using
An 8 bit ADC hasa full scale input of 2.55 V. If other cumulative errors are 2.55 mV, determine the maximum error
A counter is designed withsix stages of flip flops. Determine the output frequencyat the last (sixth) stage, when input frequency is 1 MHz.
The ethernet protocol uses
The value of c which makesthe angle $$45^\circ$$ between $$\overline{a} = i + cj$$ and $$\overline{b} = i + j$$ is
In a daisy chained connection to the CPU,the peripheral whose interrupt request has the highest priority is the one
RS-232 interface
Assuming ideal conditions, the speed up obtained from a balanced N stage pipeline is
The number of comparators required in an 8-bit flash-type A/D converter is
Minimum numberof 2-input NAND gates that willbe required to implement the function: Y = AB + CD + EF is
In a ripple counter how many changes in state happen when count changes from 7 to 8?
A programmable device (PROM) is
In asynchronous circuits, which of the following best explains a dynamic hazard
Digital signal processors use a computer architecture derived from
Which of the following represents the Moore model for sequential circuits?
An anti-aliasing filter is
Which of the following filter has the fastest roll-off ?
Find the rms value of the signal $$x(t) = 5 \cos \left(50 t + \frac{\pi}{3}\right)$$
Determine the value indicated by a DC voltmeter for the waveform given below
Evaluate the function $$\int_{0}^{\infty}t^2 \delta(t - 3)dt$$
A husband and wife appear in an interview for two vacancies for same post. The probability of husband getting selected is $$\frac{1}{5}$$ while the probability of wife getting selected is $$\frac{1}{7}$$. Then the probability that anyone of them getting selected is
The rms value of Complex waveforms are measured using
Find the fundamental Period T of the following continuous signal
$$x(t) = 20 \cos (10 \pi t) + \frac{\pi}{6}$$
In the circuit shown the switch closes at t=0. The voltage across 4 $$\mu F$$ capacitor in ideal condition changes to
The 2 - part network of Fig A has open circuit impedance parameters given by matrix
The network shown in the figure draw a current I. If the ends a and b are shorted, the current drawn would be
As comparedto a full-waverectifier using two diodes, the four diode.bridge rectifiier has the dominant advantage of
When a unit impulse voltage is applied to an inductor of 1 H, the energy supplied by the source is
The value of R for i = 2A is
The time constant for the circuit shown below is
For a sinusoidal input, the circuit shown in the figure will act as a
A second-order band-pass activefilter can be obtained by cascading a low pass second order section having cutoff frequency $$f_{OH}$$ with a high pass second ordersection having cut-off frequency $$f_{OL}$$, provided
If $$\alpha = 0.995, I_E = 10 mA$$ and $$I_{CO} = 0.5 \mu A$$, then $$I_{CEO}$$ will be
A programme having features suchas data abstraction, encapsulation and data hiding, polymorphism inheritance is called
The library function exit () causes as exit from
The “go to statement” causes control to go to
The differential equation satisfying $$y = A + e^{3x} + B e^{2x}$$ is
Foran energy signalg(t) andits time-shifted version f(t - T),the
As the modulation index of an FM signal with sinusoidal modulation is increased from zero) to two, the powerin the carrier component will
For a short wave radio link between two stations via the ionosphere, the ratio of the maximum usable frequencyto the critical frequency
A carrier voltageis simultaneously modulated by two sine waves causing modulation indices of 0.4 and 0.3. The overall modulation index is
If each stage has a gain of 10 dB, andnoise figure of 10dB, then the overall noise figure of a two-stage cascade amplifier will be
De-emphasis circuit is used
An amplifier has an input power of 2 microwatts. The powergain of the amplifier iis 60 dB. The output power will be
A transmission line has a VSWR of2, the reflection coefficient is
Which vacuum based deviceis widely used as a power amplifier in satellite communication systems?
Maxwell’s equations establish the relationship between $$\overline{E}, \overline{D}, \overline{H}$$ and $$\overline{B}$$ at any point in a continuous medium. When we move from one medium to another, then which of the following statement is correct
The input impedance of shortcircuited lossless line of length less than a quarter-wavelenth is
The intrinsic impedanceof free space is 377 Ω. The approximate intrinsic impedance of a medium with relative premittivity and permeability of 4 and 1 respectively will be
A 8 kHz communication channel has an SNR of 30 GB.If the channel bandwidth is doubled, keeping the signal power constant, the SNRfor the modified channel will be
Two orthogonal signals $$s_1(t)$$ and $$s_2(t)$$ satisfy the following relation
In which modulation system, when modulating frequency is doubled, the modulation index also becomes double.
The matrix $$A = \begin{bmatrix}-4 & -3 & -3 \\1 & 0 & 1 \\ 4 & 4 & x \end{bmatrix}$$ is its own adjoint. The value of x will be
