GATE 2020:Topper's Quiz-15 (App update required to attempt this test)

Three scattering mechanisms exists in a semiconductor , if only the first mechanism was present ,the mobility would be 400 ,if only second mechanism was present ,the mobility would be 600and if only third mechanism was present , the mobility would be 1200 , then the net mobility in ________

Which of the following are essentials of a transistor biasing circuit?
1) Proper zero signal collector current flow.
2) V_CE should not fall below 0.5V for Germanium and 1V for silicon.
3) Ensure stabilization of operating point

Consider an AM system with AWGN having PSD of 10^-12 W/Hz. the baseband signal x(t) of bandwidth of 4kHz and the amplitude distribution is shown below and the signal is demodulated by envelope distortion and passed through filter. the minimum value of amplitude A_c for (S/N)₀ >=40 dB .

AWGN channel having B.W of 4 kHz, 2-sided noise PSD is given by . The Channel capacity( in kbps) required to get the signal power of 0.1 MW at channel o/p is __

The polar plot for a transfer function is shown below:

An addition of zero except origin will change the plot as?

The complex permittivity is given by 2-j. Find the loss to tangent

A silicon fabricated Solar Cell at 300K has acceptor and donor concentrations 2.5*10¹⁸ cm^-3 and 2*10¹⁶ cm^-3. The electron and hole diffusion coefficients are given as 30 cm²/s and 15 cm²/s respectively. Whereas the electron and hole carrier lifetimes are 4*10^-7 s and 2*10^-7 s. If photocurrent density is 15 mA/cm². Find the open-circuit voltage(in mV) of the solar cell if solar intensity is increased 10 times. (Assume V_T = 26mV and n_i = 1.5*10¹⁰ cm^-3)

A unity feedback control system is characterized by the open-loop transfer function

The value of k for which the system oscillates at 2 rad/s is_____

Consider a binary code that consists of four valid code words as given as 0000000, 0101101, 0011100, 0000111. Consider minimum hamming distance of code be ‘a’ and maximum number of error bits that can be corrected by the code be ‘b’ then the value of (a-b) is equal to

The intermediate frequency of an AM super-heterodyne receiver is 475 KHz and local oscillator frequency (f_LO) of mixer is set at higher of two possible values such that f_LO< f_c always. If carrier frequency (f_c) of the received signal is 1050 KHz, find carrier frequency (in kHz) of corresponding image signal.

A second-order system of unity feedback has M_r=3 and ω_r=4 rad/sec. the steady-state error for unity input is _________ .

A telephone channel has bandwidth of 3 KHZ and SNR of 1023 is connected to a discrete source which can produce 64 equiprobable independent symbols. The maximum symbol rate possible for error free transmission is ____ KbPs.

The transfer function of single pole LPF is H (f) =

The relationship between noise equivalent bandwidth and 3 – dB bandwidth will be