73951. For dielectric to dielectric interface with surface charge density, which of the following statements are true? Dn2 - Dn1 = r sEt1 = Et2En1 = En2
73952. Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].Assertion : FETs are more suitable at the input stages compared to BJTsReason: A FET has lower output impedance than a BJT.
73953. What are the ultimate purpose of minimizing logic expressions? To get small size expression.To reduce the number of variables in the given expression.To implement the function of the logic expression with least hardware.To reduce the expression for making it feasible for hardware implementation. Select the correct answer from the codes given below:
73954. A function is given f(t) = sin2t + cos2t. Which of the following is true?
73955. The amplifier network is shown below: re and z0 is:
73956. Poynting vector is associated with
73957. A random process x(t) is defined by x(t) = 2 cos (2p t + Y) where Y is a discrete random variable withP(Y = 0) = and Then Rxx (0, 1) =
73958. Consider points P and Q in the x-y plane, with P = (1, 0) and Q = (0, 1). The line integral 2 (xdx + ydy) along the semicircle with the line segment PQ as its diameter
73959. What are the counting stages (Q1, Q2) for the counter shown in the figure below?
73960. Consider the transmission line of length 37.5 cm, which is terminated into zero resistance. This line is being exited by a source of 1 GHz which has an internal impedance of 50 Ω. What is the input impedance of the line as seen by the source?
73961. Consider the following statements:For a square waveguide of cross-section 3m x 3m it has been found At 6 GHz dominant mode will propagateAt 4 GHz only dominant modes and evanescentAt 11 GHz all the modes and no higher order mode will propagateAt 7 GHz degenerate modes will propagate Which of the above statements are correct?
73962. The circuit shown depicts :
73963. Which of the transistor models is most preferred for the analysis of a transistor circuit both at mid-band and at high frequencies?
73964. It is very likely in __________ gate family that when one gate is driving number of gates in __________ , a gate having least voltage for saturation may consume large __________ leaving other gates inoperative and this phenomenon is called __________ .
73965. For a system with transfer function The bandwidth of the system is (rad/sec)
73966. Consider the following: DistortionGainBias stabilizationSensitivityFrequency response Which of these properties of the power amplifier one should concentrate upon while designing a good power amplifier circuit?
73967. In the silicon BJT circuit shown below, assume that the emitter area of transistor Q1 is half that of transistor Q2.The value of current I0 is approximately
73968. A silicon wafer has 100 nm of oxide it and is inserted in a furnace at a temperature above 1000°C for further oxidation in dry oxygen. The oxidation rate
73969. When a vector has positive divergence, it indicates that the vector quantity has at that point and if the divergence is negative, it indicates __________ .
73970. A function of one of more variables which conveys information on the nature of physical phenomenon is called
73971. Which of the following counters can be used to divide the clock frequency of a microprocessor by 5?
73972. In the given circuit, the switch has been in position 1 for quite a long time. At t = 0 the switch is moved to position 2. At this position what is the time constant?
73973. A divide by 78 counters can be realized by using
73974. The process of extension of a single-crystal surface by growing a film in such a way that the added atoms form a continuation of the single-crystal structure is called
73975. Which of the following are the non-linear application of op-amp? Current-to-voltage converterComparatorPeak detectorLimiter Select the correct answer from the codes given below:
73976. Which of the following introduces mode partition noise?
73977. Consider the differential amplifier shown in figure. (Assume β is very high).Zin (base) =
73978. Assertion (A): The line integral of B about a closed contour, in a region containing steady current, is μ0 times the total net current, following through the contour of integration.Reason (R): The curl of B is equal to μ0 times the current density vector J
73979. It is required to match a 200 Ω load to a 450 Ω transmission line. To reduce the SWR along the line to 1, what must be the characteristic impedance of the quarter-wave transformer used for this purpose, if it is connected directly to the load?
73980. In an n-type silicon crystal at room temperature, which of the following can have a concentration of 4 x 1019 cm-3?
73981. The reflection coefficient on a 500 m long transmission line has a phase angle of - 150°. If the operating wavelength is 150 m, what will be the number of voltage maxima on the line?
73982. Consider the following assertionsSI: For Zener effect at occur, a very abrupt junction is requiredS2: For quantum tunnelling to occur, a very narrow energy barrier is requiredWhich of the following is correct?
73983. Given below a block diagram of oscillator circuit with various reactance elements. For colpitts oscillator which is correct?
73984. A magnetic field in air is measured to beWhat current distribution leads to this field?[Hint: The algebra is trivial in cylindrical coordinates.]
73985. For a series R-L-C circuit, the characteristic equation is given as If is denoted by a and by β, then under the condition of β2 > a 2, the system will be
73986. In the epitaxial diffused method of fabricating integrating circuits the process involved are __________ Epitaxial growthDiffusionSilicon diode growthVacuum evaporation of aluminiumPhotoetching The correct order is
73987. The switch in the circuit shown was on position a for a long time, and is moved to position b at time t = 0. The current i(t) for t > 0 is given by
73988. For a standard 2nd order system the maximum overshoot is 10% to an unit step input. If the magnitude of the input is doubled, then maximum overshoot and percentage of maximum overshoot is:
73989. The minimum energy of a photon required for intrinsic excitation is equal to
73990. The circuits with active pull up are preferred because of their stability for
73991. A scheme shown below is to generate a wide band FM modulate signal. Narrow band FM has carrier frequency = 400 KHz Deviation ratio = 0.2 Wide band FM has carrier frequency = 100 MHz Deviation ratio = 6 Local oscillator frequencies can be
73992. How many maximum number of functions can be defined with two symbols which are Boolean in nature:
73993. The OP-AMP circuit shown above represents a
73994. For a periodic signal with finite number of discontinuities in each period, at isolated points of discontinuity the series converges to __________ .
73995. What is the approximate steady state current in the above circuit?
73996. The following graph, the number of trees (P) and the number of cut-sets (Q) are
73997. Which one of the following is used as the interface chip for data transmission between 8086 and a 16-bit ADC?
73998. Assertion (A): An unbiased p-n junction develops a built-in potential at the junction with the n-side positive and the p-side negative.Reason (R): The p-n junction behaves as a battery and supplies current to a resistance connected across its terminals.
73999. Consider the following: OscillatorEmitter followerCascaded amplifierPower amplifier Where of these use feedback amplifiers?
74000. Which of the following photodetector does not provide gain?
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