You Are On Multi Choice Question Bank SET 1470
73503. Find resistance RB to bring transistor to threshold of saturation (VCB = 0), VBE = 0.7 V, a = 0.96
73504. A system with transfer function has an output for the input signal . Then, the system parameter 'p' is
73505. The current i(t), though a 10 Ω resistor in series with an inductance, is given by i(t) = 3 + 4 sin (10t + 45°) + 4 sin (300t + 60°) Amperes. The RMS value of the current and the power dissipated in the circuit are
73506. A transmitter radiates a power 20 KW and its base current is 18A. The radiation resistance of the antenna is
73508. The Boolean expression B⊕E is a simplified version of expression A BE + BCDE+ BC D E + A B D E + B C D E + A B D E then which of the following choice is correct? don't care conditions doesn't existdon't care conditions existd( 16, 18, 20, 23, 27, 29) is the set of don't care conditionsd( 16, 20, 22, 27, 29) is the set of don't care conditions
73509. A white noise X(t) with two-sided power spectral density 1 x 10-10 W/Hz is input to a filter whose magnitude squared response is shown below.The power of the output process Y(t) is given by
73510. A short vertical grounded antenna is required to radiate at 1 MHz. The effective height of the antenna is 302 m. The calculated value of radiation resistance is
73512. Consider an angle modulated signalx(t) = 6cos[2p x 106t + 2sin(8000p t) + 4cos(8000p t)] VThe average power of x(t) is
73513. Two discrete time systems with impulse responses h1[n] = δ[n - 1] and h2[n] = δ[n - 2] are connected in cascade. The overall impulse response of the cascaded system is
73515. A message signal given by is amplitude modulated with a carrier of frequency ωc to generate s(t) = [1 + m(t)] cos ωct
73517. A first order system will never be able to give a __________ response. Band passBand rejectAll pass Choose the correct option
73518. A function n(x) satisfied the differential equation where L is a constant. The boundaryconditions are: n(0) = K and n(∞) = 0. The solution to this equation is
73520. 50 independent low pass signals of bandwidth W, 2W, 3W, W, 2W, 3W, W, 2W, 3W Hz are to be time division multiplexer on a common channel using PAM. To achieve this, the minimum transmission capacity of the channel should be __________ .
73521. Two coils X of 1000 turns and Y of 2000 turns are placed such that 60% of the flux produced by coil X links coil Y. A current of 1 A in coil X produces 0.1 wb flux. The mutual inductance between coils is
73522. { x(n) } is a real-valued periodic sequence with a period N. x(n) and X(k) form N-point. Discrete Fourier Transform (DFT) pairs. The DFT Y(k) of the sequence. y(n) = x(r) X (n + r) is
73523. The signal x(t) is described by Two of the angular frequencies at which its fourier transform becomes zero are
73526. Consider the frequency modulated signal 10 cos (2p x 105t + 5 sin (2p x 1500t) + 7.5 sin (2p x 1000t) with carrier frequency of 105Hz. The modulation index is
73527. A system with transfer function H(z) has impulse response h(.) defined as h(2) = 1, h(3) = -1 and h(k) = 0 otherwise. Consider the following statementsS1: H(z) is a low pass filterS2: H(z) is a FIR filter.Which of the following is correct?
73528. Consider an incremental vector element of length ΔL and angle between an electric field E and ΔL s cos θ. Then in which direction should ΔL be placed to be obtain maximum value of Δv?
73529. A MOD - 2 counter, the FF has a tpd = 60 nsec. The NOR gate has a tpd of 30 nsec. The clock frequency is
73531. If the Laplace transform of the voltage transform of the voltage across a capacitor of value F is the value of the current through the capacitor at t = 0+ is
73532. The switching expression corresponding to :f(A, B, C, D)= ∑(0, 3, 4, 7, 8) + (10, 11, 12, 14, 15) is:
73533. Given the function F(A, B, C, D) = m(0, 1, 2, 3, 4, 6, 8, 9, 10, 11, 12). The minimized form of the function can be given by :
73535. A germanium diode has a reverse saturation current of 30 μA at 125°C and forward current of 1 mA at a forward potential of 0.8 V and the reverse potential is 0.6 V What are its dynamic forward and reverse resistance at this temperature.
73537. A radio wave is incident on a layer of ionosphere at an angle of 30° with the vertical. If the critical frequency is, 1.2 MHz, the maximum usable frequency is
73539. Fourier transform of signal obtained after taking difference between step function and its reverse version is given as __________ .
73542. Calculate the electrostatic force of repulsion between two mica particles at a distance of 10-13 m from each other. Charge on a particle is 3.2 x 10-19 C. (relative permittivity for mica is 5)
73543. An electromechanical closed loop control system has the following characteristics equation :s3 + 6Ks2 + (K + 2)s = 8where K is the forward gain of the system. The condition for closed loop stability is
73544. What is the propagation constant for air filled wave guide with dimensions a = 1.59" and b = 0.795" at 4.95 GHz. The wave impedance is
73545. An antenna array comprises of two dipoles that are separated by wavelength. The dipoles are fed by currents of the same magnitude and 90° in phase. The array factor is:
73546. An air-filled rectangular waveguide has dimensions 8cm x 10cm . The wavelength of waveguide at frequency 3 GHz
73547. NMOS devices have __________ switching speeds and __________ on-state resistance; as compared with PMOS devices.
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