You Are On Multi Choice Question Bank SET 1475
73751. Assertion (A): When all inputs of a NAND-gate are shorted to get a one input, one output gate, it becomes an inverter.Reason (R): When all inputs of a NAND-gate are at logic 'O' level, the output is at logic 'I' level.
73754. Which of the following are included in the architecture of a computer? Addressing modes, CPUInstruction set, data formatsSecondary memory, operating system Select the correct answer from the codes given below:
73755. Consider the CMOS circuit shown, where the gate voltage VG of the n-MOSEFT is increased from zero, while the gate voltage of the p-MOSFET is kept constant at 3 V. Assume that, for both transistor, the magnitude of the threshold voltage is 1 V and the product of the transconductor parameter and the (W/L) ratio, i.e. the quality μC0x(W/L), is 1mA. V-2.For small increase in VG beyond IV, which of the following gives the correct description of the region of operation of each MOSFET?
73756. Two identical NMOS transistors M1 and M2 are connected as shown below. Vbias is chosen so that both transistors are in saturation. The equivalent gm of the pair is defined to be at constant VoutThe equivalent gm of the pair is
73757. In a digital voltmeter the oscillator frequency is 400 kHz and the ramp voltage falls from 8 V to 0 V in 20 ms. What is the number of pulses counted by the counter?
73759. For a second order instrument, the optimum range of ξ (damping ratio), which gives good frequency response over a wide range of frequencies is
73760. If the connection of two-port is such that the transmission matrix of the overall network is the product of the transmission matrices of the individual networks, what type of connection is it?
73761. A 3 x 8 decoder with two enable inputs is to be used to address 8 blocks of memory. What will be the size of each memory block when addressed from a sixteen bit bus with two MSBs used to enable the decoder?
73763. Time delay produced by an instruction code given below using 2 MHz clock is: MVI A, FFH
LOOP: DCR A
JNZ Loop
73764. Refer to the NAND and NOR latches shown in the figure. The inputs (P1, P2) for both the latches are first made (0, 1) and then, after a few seconds, made (1, 1). The corresponding stable outputs (Q1, Q2) are
73765. Consider the following two statements about the internal conditions in an n-channel MOSFET operating in the active regionS1: The inversion charge decreases from source to drainS2: The channel potential increases from source to drainWhich of the following is correct?
73767. For what positive value of K does the polynomial s4 + 8s3 + 24s2 + 32s + K have roots with zero real parts?
73768. Which of the following capabilities are available in a Universal Shift Register? Shift leftShift rightParallel loadSerial add Select the correct answer from the codes given below:
73770. Which of the following statements is/are true for a good conductor of electricity? Its conductivity decreases with increasing temperature.Number of free electrons is around 1028 m-3.Its conductivity decreases with addition of impurities.It is a good conductor of heat also.
73772. A signal x1(t) and x2(t) constitute the real and imaginary parts respectively of a complex valued signal x(t). What form of waveform does x(t) possess?
73775. Six sets of electromagnetic waves are given below :30 - 300 KHz10 - 30 KHz3 - 30 MHz300 - 3000 KHz30 - 300 MHz> 300 MHzThere are designated in the following order
73776. Which among the following waveforms can be reconstructed from its samples without distortion?
73778. An average response rectifier type electronic voltameter has a d.c. voltage of 10 V applied to it. What is the meter reading?
73779. Consider the common emitter amplifier shown below with the following circuit parameters: β = 100, gm = 0.3861 A/V, r0 = ∞ rp = 259 Ω, Rs = 1 kΩ, RB = 93 kΩ, RC = 250 Ω, RL = 1 kW, C1 = ∞ and C2 = 4.7mF.The lower cut-off frequency due to C2 is
73781. A message signal x(t) is amplitude modulated with carrier c(t). x(t) = 2 sin 600p t c(t) = 8 cos (2p x 106 t) such that the modulated signal is (8 + 2 sin 600p t) [cos 2p x 106 t] The total side band power is:
73782. The cross section of a JFET is shown in the following figure. Let Va be - 2 V and let Vp be the initial pinch-off voltage. If the width W is doubled (with other geometrical parameters and doping levels remaining the same), then the ratio between the mutual transconductances of the initial and the modified JFET is
73784. A 2 μF capacitor is shunted by a 1 kΩ maintained at temperature 400 K. The rms noise voltage across the capacitor over the entire frequency band is:
73785. Consider the following statements: Acceptor level is formed very close to the conduction band.The effective mass of the free electron is same as that of a hole.The magnitude of the charge of a free electron is same as that of a hole.Addition of donor impurities adds holes to the semiconductor. Which of the above statements are correct?
73786. The following properties are associated with ferroelectric materials: Its susceptibility is negative.The susceptibility is expressed aswhere c is the Curie constant and Tc is the Curie temperature.It has permanent dipoles oriented randomly. Which of the above statements is/are correct?
73787. Consider the following statements:For a master-slave J-K flip-flop, the toggle frequency is the maximum clock frequency at which the flip-flop will toggle reliably.the data input must precede the clock triggering edge transition time by time minimum time.the data input must remain fixed for a given time after, the clock triggering edge transition time for reliable operation.propagation delay time is equal to the rise time and fall time of the data. Which of the above statements is/are correct?
73788. There are four different algorithms A1, A2, A3 and A4 to solve, a given problem with the complexity order log(n), log(log(n)), n log and n/log(n) respectively. Which is the best algorithm?
73789. The figure below shows a long infinite length conduction placed as shown. Current flowing in a conductor is 2 amps. Then magnetic field at point A is:
73790. Consider the following statements regarding the class-B power amplifiers (Complementary symmetry type): The efficiency of the amplifier is higher than that of class-A amplifierThe power output is lowCrossover distortion is presentThe standby power dissipation is absent. Which of the above statements are correct?
73791. Consider the following statements:For a 10 m long common power line connecting a switch to a light bulb It is a distributed circuit.Time delay for propagation through it is negligible.It is the form of a shielded coaxial cable of circular cross-section.As the intensity of the lamp varies, input impedance of this line also changes. Which of the above statements is/are correct?
73795. A standard waveguide W R90 has inside wall dimensions of a = 2.286 cm and b = 1.016 cm. What is the cut-off wavelength for TE01 mode?
73797. Which one of the following logic families can be operated using a supply voltage from 3 V to 15 V?
73798. The circuit shown in the figure is used to charge the capacitor C alternately from two current sources as indicated. The switches S1 and S2 are mechanically coupled and connected as followFor 2nT ≤ t < (2n + 1)T, (n = 0, 1, 2, ...) S1 to P1 and S2 to P2For (2n + 1) T ≤ t < (2n + 2)T, (n = 0, 1, 2, ...) S1 to Q1 and S2 to Q2 Assume that the capacitor has zero initial charge. Given that u(t) is a unit step function, the voltage Vc(t) across the capacitor is given be
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