You Are On Multi Choice Question Bank SET 1464
73201. A uniform plane magnetic wave incident normally on a plane surface of a dielectric material is reflected and the percentage of reflected power is 75% What is VSWR?
73202. Silicon is doped with boron to a concentration of 4 x 1017 atoms/cm3. Assuming the intrinsic carrier concentration of silicon to be 1.5 x 1010/cm3 and the value of to be 25mV at 300K. Compared to undoped silicon, the Fermi level of doped silicon
73203. The Fourier series of a real periodic function has only Cosine terms if it is evenSine terms if it is evenCosine terms if it is oddSine terms if it is odd Which of the above statements are correct?
73204. A communication channel with AWGN operating at a signal to noise ratio SNR >> 1 and bandwidth B has capacity C1. If the SNR is doubled keeping B constant, the resulting capacity C2 is given by
73205. Power gain of antenna equals directive gain in VHF and UHF range if and only if efficiency of the antenna is __________ .
73206. A square in which each (i, j)th element of matrix is equal to the negative of the conjugate complex of (j, i)th element, is called
73208. The characteristic equation of a feedback control system is given by s3 + 5s2 + (K + 6)s + K = 0where K > 0 is a scalar variable parameter. In the root-loci diagram of the system the asymptotes of the root-locus for large values of K meet at a point in the s-plane, whose coordinates are :
73210. Consider a stable and causal system with impulse response h[n] and rational system function H(z). Suppose it is known that H(z) contains a pole at z = 1/2 and a zero some where on the unit circle. The precise number and locations of all of the other poles is unknown.The following statement which is false is __________ .
73215. In the following transistor circuit VBE = 0. 7 V, rc = 25mV/IE, and β and the capacitance are very largeThe value of DC current IE is
73216. A certain JK FF has tpd = 12 nsec. The largest MOD counter that can be constructed from these FFs and still operate up to 10 MHz is
73217. A second-order system has a transfer function is given by . If the system, initially at rest is subjected to a unit step input at t = 0, the second peak in response will occur at :
73219. A periodic voltage has following values for equal time intervals changing suddenly from one value to next : 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, - 5, - 10 etc.RMS value of the waveform is :
73220. The magnitude plot of a rational transfer function G(s) with real coefficients is shown below. Which of the following compensators has such a magnitude plot?
73225. A sphere with charge Q was placed in, but not touching a larger hollow sphere. If there is any charge initially on the outer sphere; to remove it the outer sphere was earthed momentarily, and then the inner sphere was removed. The charge remaining on the outer sphere was then measured. This charge was found to be __________ to the charge on the inner sphere.
73227. Two products are sold from a vending machine, which has two push buttons P1 and P2. When a button is pressed, the price of the corresponding product is displayed in a 7-segment display. If no buttons are pressed, '0' is displayed, signifying 'Rs' .0'. If only P1 is pressed, '2' is displayed, signifying 'Rs. 2'.If only P2 is pressed, '5' is displayed, signifying 'Rs. 5'.If both P1 and P2 are pressed, 'E' is displayed, signifying 'Error'. The names of the segments in the 7-segment display, and the glow of the display for '0', '2', '5' and 'E', are shown below.Consider push button pressed/not pressed is equivalent to logic 1/ 0 respectivelya segment a to g are considered as functions of P1 and P2, then which of the respectively. If segments a to g are considered as functions of P1 and P2, then which of the following is correct?
73229. Find the value of K and velocity constant Kv so that the maximum overshoot in the unit step response is 0.2 and the peak time is 1 sec.
73230. The transfer function of a discrete time LTI system is given byConsider the following statements:S1: The system is stable and causal for ROC: |z| > 1/2S2: The system is stable but not causal for ROC: |z| < 1/4S3: The system is neither stable nor causal for ROC: 1/4 < |z| < 1/2Which one of the following statements is valid?
73231. In the following network, the switch is closed at t = 0- and the sampling starts from t = 0. The sampling frequency is 10Hz.The expression and the region of convergence of the z-transform of the sampled signal are
73233. In a transmission line terminated with a load equal to the characteristic impedance, the reflection coefficient is
73234. Consider a control system shown in given figure. For slight variation in G, the ratio of open loop sensitivity to closed loop sensitivity will be given by
73235. Consider the signal S(t) shown below :The slope of the matched filter output during the interval
73240. Which factor determines whether the medium is free space, lossless dielectric, lossy dielectric or good conductor?
73241. In the following circuit, the switch S is closed at t = 0 The rate of change of current (0 +) is given by
73243. Consider the following program segment written for 8085 based system LXI SP, FFFFH
MVI A, FFH
MOV BB, A
K: DCR B
PUSH HL
JNZ K
INR A
LXI H, FFCEH
CPI 20H
LHLDThe contents of accumulator is :
73244. The reduced form of the functionY(A, B, C, D, E, F) = ∑m(0, 1, 2, 3, 4, 6, 7, 8, 9, 12, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 28, 30, 31) is given by:
73245. A 1000 kHz carrier wave modulated 40% at 4000 Hz is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulation after transmission through this circuit?
73246. For the circuit, let us assume that R = 1 Ω, L = 10-3 H, and V(t) = 10 cos (1000t + 30°)V and the differential equation for I(t) is given by
73249. Find E at P(1, 1, 1) caused by four identical 3 nC point charges located at P1(1, 1, 0), P2(- 1, 1, 0), P3(- 1, - 1, 0) P4(1, - 1, 0)
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