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ESE EC 2021 Technical Quiz 6
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Question 1
An intrinsic silicon sample is doped with boron. Find doping concentration in if Fermi level lies 0.416eV below the intrinsic Fermi level. Also assume that ni 1.5 × 1010/cm3 and kT = 0.026 eV
Question 2
A radar transmits pulse with a duration of 1.5 μs at a pulse repetition frequency (PRF) of 8 kHz. If the peak power of this radar is 500 kW, then the average power will be
Question 3
When the damping force is more than the optimum, the instrument will become
Question 4
A binary bipolar signal s(t) is a ‘+A’ volt or ‘–A’ volt pulse during the interval (0, Tb) in the binary system P(S1) = P(S2) = , A = 20 mV, = 2 x 10–10 w/Hz and the transmission rate is 2 x 105 bps. Assume approximation , the probability of error is
Question 5
Let be the unit step signal and
The region of convergence of z-transform of is
The region of convergence of z-transform of is
Question 6
Consider the circuit shown below:
The switch “S” is closed for a long time and opened at t = 0. The value of the voltage Vc(t) at t = 0 is
Question 7
What do we call the material which gets strongly magnetised when placed in an external magnetic field?
Question 8
Match List I (digital circuit) with list II (use) and select the correct answer using the codes given below
List I
A) Left shift register
B) right shift register
C) ROM
D) Demultiplexer
List II
1) Code conversion
2) Multiplication
3) Decoding
4) Division
A - B - C - D
Question 9
Find the value of V1 for the circuit shown below.
Question 10
If G(s) is stable for 9 < k < 27 for first loop. Then for overall system to be stable range of k is?
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ESE & GATE ECGeneralMar 6ESE & GATE EC