A TV picture is to be transmitted over a channel of 6 MHz bandwidth at adB S/N ratio. The capacity of the channel is
As the temperature increases the mobility of electrons __________ .
The analog signal given below is sampled atsamples per second. m(t) = 2 sinpt + 3 sinpt + 4 sinpt + 5 sinpt + 6 sinpt + 7 sinpt. The folding (maximum) frequency is __________ .
Find Vx Vy Vz
An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase velocity of guided wave at frequency of 3 GHz for TE10 mode is
In a 4 bit weighted resistor D/A converter, the resistor value corresponding to LSB iskΩ. The resistor value corresponding to MSB will be
The star equivalent C1 C2, C3 of the delta network is respectively
For real values of x, the minimum value of the function f(x) exp (x) + exp (- x) is
Assertion (A): Conductors do not permit propagation of waves more than a short distance into the conductor at microwave frequencies.
Reason (R): The relaxation time constant for conductors is much small than the period of centimetric EM wave.
The value of the integral is
An antisymmetric filter having odd number of coefficient may have a performance as
A material has conductivity of 105 mho/m and permeability of 4p x 10-7 H/m. The skin depth at 9 GHz is
If a signal f(t) has energy E, the energy of the signal f(2t) is equal to __________ .
An image usesxpicture elements. Each of the picture elements can take any of the 8 distinguishable intensity levels. The maximum entropy in the above image will be
A tachometer has a sensitivity of 4 V/rpm. Express the gain constant of the tachometer in the units volts/(rad/sec).
For a npn BJT transistor fβ is 1.x 108 Hz. Cμ = 10-14 F; Cp = 4 x 10-13 F and DC current gain isFind fT and gm (fβ = cut off frequency, Cμ = capacitance, Cp = parasitic capacitance, gm = transconductance, fT = gain BW product)
The impulse response h(t) of a linear time-invariant continuous time system is described by h(t) = exp (at) u(t) + exp (βt) u (- t), where u(t) denotes the unit step function, and a and β are constants. This system is stable if
A certain system has transfer function a is a parameter. Consider the standard negative unity feedback configuration as shown below.Which of the following statements is true?
For a series resonant circuit at low frequency circuit impedance is __________ and at high frequency circuit impedance is __________ Fill in the blanks respectively
The amplitude of a pair of composite sinusoidal signal y(n) = x1(n) + x2(n) with x1(n) = sin (5pn) x2(n) = 3 sin (5pn) is __________ .
In a semiconductor material. The hole concentration is found to be 2 x 2.5 x 1015 cm-3. If mobility of carriers is 0.m2/ v-s. Then find the current density if electric field intensity is 3.x 10-19
If we manage to __________ our natural resources, we would leave a better planet for our children.
A transmission line has a characteristic impedance ofΩ and a resistance of 0.1 Ω/m, if the line is distortion less, the attenuation constant (in Np/m) is
ωL =
(2)3 + (3)4 = (?)5
Find Y- parameters
A rectangular waveguide, in dominant TE mode, has dimensionscm xcm. The cut off frequency is
A signal with ±V ranged and 1 KHz band width is being digitized using a sample and hold circuit and abit quantizer. The minimum sampling rate is :
A n-channel JFET has IDSS = 2 mA, Gate to source voltage VGS = - 2 V and trans-conductance is 0.5 mW then pinch-off voltage is __________ .
A MOSFET has a threshold voltage of 1 V and oxide thickness ofx 10-8 [εr = 3.ε0 = 8.x 10-14 F/cm, q = 1.6 x 10-19 c]. The region under the gate is ion implanted for threshold voltage tailoring. The base and type of impant required to shift threshold voltage to - 1 V are __________ .
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