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ISRO EC Live Quiz Session 2018: Solution (6th April)

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Question 1

Consider an abrupt PN junction (at T = 300 K) shown in the figure. The depletion region width Xn on the N-side of the junction is 0.2 μm and the permittivity of silicon si) is 1.044x10-12 F/cm At the junction, the approximate value of the peak electric field (in kV/cm) is _________.

Question 2

Certain current distribution gives rise to the vector magnetic potential
  Wb/m.The flux through the surface defined by  is ­ ­ ­ ­ ­______ Wb.

Question 3

A logic circuit consist of two 2 x 4 decoder as shown in figure

The output of the decoder are as follows:
Do = 1 when Ao = 0 and A1 = 0
D1 = 1 when Ao = 1 and A1 = 0
D2 = 1 when Ao = 0 and A1 = 1
D3 = 1 when Ao = 1 and A1 = 1
The value of f(x,y,z) is

Question 4

The bridge most suited for measurement of a four-terminal resistance in the range of is

Question 5

In the schmitt trigger circuit shown in figure, If VCE(sat) = 0.1V, the output logic low level (VOL) is
     

Question 6

Match the following List-I with List-II
List-I
A) PCM
B) FSK
C) Asynchronous TDM
D) DM
List-II
1) Telegraphy
2) Pulse shifting
3) Simple circuit
4) Companding
5) Threshold effect

Question 7

While simplifying a block diagram, a take-off point is moved ahead of a block as shown below. Find the value of A

Question 8

The solution of the differential equation Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE EC 10-Mar\GATE-ECE-2015-Paper-1_files\image122.png with y(0 = y’(0) = 1 is

Question 9

When the optical power incident on a photodiode is and the responsivity
is 0.8 A/W, the photocurrent generated (in ) is

Question 10

A one bit full adder takes 75 nsec to produce sum and 50 nsec to produce carry. A 4 bit parallel adder is designed using this type of full adder. The maximum rate of additions per second can be provided by 4 bit parallel adder is Ax106 additions/sec. The value of A is _____ .
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