BARC Full Syllabus Test 13 for ESE & GATE EC Exams

Question 1

What is the zero signal base current in the emitter bias circuit shown in Fig.? The transistor is of silicon.

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Question 2

A communication channel disturbed by Gaussain noise has a bandwidth of 6 kHz and S/N ratio of 15. The maximum transmission rate that such a channel can support is

Question 3

In the circuit shown in Fig., the d.c. level of base current is (transistor is of silicon)
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Question 4

An 8085 assembly language program is given as follows.

LXI H, 8100 H

MVI M, 20 H

MVI A, 40 H

INX H

MVI M, 30 H

ADD M

HLT

The value of A at the end of the execution of the program is

Question 5

An electrostatic field is given by

Find the work done in moving a point charge Q = - 20 μC from the origin to (4, 0, 0)m.

are the unit vectors along x, y axes.

Question 6

The total secondary voltage in a centre-tapped full-wave rectifier is 125 V r.m.s. Neglecting the diode drop, the r.m.s. output voltage is

Question 7

A binary channel with capacity 63 kbits/s is available for PCM voice transmission. If signal is band limited to 5 kHz. Then the appropriate values of quantizing level L and the sampling frequency will be

Question 8

The f_p and f_s of a crystal are 412 kHz and 411 kHz respectively. What will be the frequency of oscillations when the crystal is used in an oscillator?

Question 9

An insulating solid sphere of radius R has uniform positive volume charge density and total charge Q. Find the electric potential at a point outside the sphere, at a distance r from the centre of the sphere. Coulomb constant is given by,

Question 10

A committee consists of experts taken from three institutions A. B and C, of which 2 are from A, 3 are from B and 4 are form
C. If three experts resign, then the probability that they belong to different institutions is

Question 11

Figure shows the Hartley oscillator. If

= 1000

,

= 100

, mutual inductance between

and

is M=20

and C = 20 pF, then feedback fraction is

Question 12

A circuit produces an output

where

is its input. This circuit can produce which one of the following?

Question 13

For implementing Boolean function F(A,B,C,D) = ∑m (0,1,2,4,6,9,12,14) using 8:1 multiplexer with select lines as B,C and D . While of the following is correct?

Question 14

Consider the source-follower circuit in fig. The values of parameter are

mS and

The voltage gain

is:-

Question 15

i) x + 2y – z = 6

ii) x + by – 9z = 11

iii) 3x + cy – 18z = 33

For what values of b and c the system has infinite number of solution?