Q. A 100 W light source emits uniformly in all directions. A photodetector having a circular active area whose diameter is 2 cm is placed 1 m away from the source, normal to the incident light. If the responsivity of the photodetector is 0.4 A/W, the photo-current generated in the detector, in units of mA, […]
Q. A piezoelectric transducer with sensitivity of 30 mV/kPa is intended to be used in the range of 0 kPa to 100 kPa. The readout circuit has a peak noise amplitude of 0.3 mV and measured signals over the full pressure range are encoded with 10 bits. The smallest pressure that produces a non-zero output,
Q. In the circuit below, the light dependent resistor (LDR) receives light from the LED. The LDR has resistances of 5 k W and 500 W under dark and illuminated conditions, respectively. The LED is OFF at time π‘ < 0. At time t =Β 0 s, the switch S1 is closed for 1 ms and
Q. In the circuit shown below, assume that the comparators are ideal and all components have zero propagation delay. In one period of the input signal πππ = 6 sin(ππ‘), the fraction of the time for which the output OUT is in logic state HIGH is Sol: The output represents X-NOR gate. So, the given
Q. A voltage amplifier is constructed using enhancement mode MOSFETs labeled M1, M2, M3 and M4 in the figure below. M1, M2 and M4 are n-channel MOSFETs and M3 is a p-channel MOSFET. All MOSFETs operate in saturation mode and channel length modulation can be ignored. The low frequency, small signal input and output voltages
Daily Quiz on Current Affairs 29 August 2023 is very important for Competitive Exams like SSC, Railway, RRB, Banking, IBPS, PSC, UPSC, etc. Our Gkseries team have composed these Current Affairs Quizzes from Newspapers like The Hindu and other competitive magazines.
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Q. The forward path transfer function L(s) of the control system shown in Figure (a) has the asymptotic Bode plot shown in Figure (b). If the disturbance d (t) is given by d(t) = 0.1sin(wt) where w = 5 rad s , the steady-state amplitude of the output y(t) is Sol: as r = 0
Q. A complex function π(π§) = π’(π₯, π¦) + π π£(π₯, π¦) and its complex conjugate πβ(π§) = π’(π₯, π¦) β π π£(π₯, π¦) are both analytic in the entire complex plane, where π§ = π₯ + π π¦ and π = ββ1 . The function π is then given by Sol: f(z) = u(x,
Q. The function π(π₯) is given by π(π₯) = π΄/π₯π where π΄ and π are constants with π > 1 and 1 β€ π₯ < β and π(π₯) = 0 for ββ < π₯ < 1. For π(π₯) to be a probability density function, the value of π΄ should be equal to Sol:
Q. The curve y = f (x) is such that the tangent to the curve at every point (π₯, π¦) has a π-axis intercept π, given by π = βπ¦. Then, f (x) is proportional to (A) x–1 (B) x2 (C) x3 (D) x4 Ans: x2 Sol: Let the equation of tangent is, y =
