Hi buddy here I am looking for ISRO Electronics and Communication Engineering Papers for its ISRO Scientist Engineer recruitment exam , so can you plz provide me here ??

As you are looking for ISRO Electronics and Communication Engineering Papers for its ISRO Scientist Engineer recruitment exam, so on your demand I have provided here :


1. In an amplitude modulated system if the total power is 600W and the power in
the carrier is 400W, the modulation index is - -
a. - 0.5
b. 0.75
c. 0.9
d. 1
2. The channel capacity under the Gaussian noise environment for a discrete
memoryless channel with a bandwidth of 4MHz and SNR of 31 is.
a. 20 Mbps
b. 4 Mbps
c. 8 kbps
d. 4 kbps
3. In satellite communication, frequency modulation is used because satellite
channel has
a. High modulation index
b. Small bandwidth and negligible noise
c. Large bandwidth and severe noise
d. Maximum bandwidth and minimum noise
4. For a 3-um-diameter optical fiber with core and cladding indexes of refraction of
1.545 and 1.510, respectively. The cut off wavelength is.
a. 2.3um
b. 1.29um
c. 1.5um
d. 3.24 um
5. A 12-bit ADC is operating with a lus clock period and total conversion time is
seen to be 14us always. The ADC must be of the type
a. Flash type
b. Counting type
c. Integrating type
d. Successive approximation type
Page 2 of 17
Page 2
ECTRONICS – 2014 - - -----——--SET-A
10.
11.
Consider the analog signal x(t) = 3cos 100tt. If the signal is sampled at 200Hz, the
discrete time signal obtained will be
a. 3cos(TIn/4)
b. 3cos(tn/2)
c. 3cos(Tn)
d. 3cos(tn/3)
In VHDL all the statements written inside a process statement are
a. Concurrent
b. Sequential
c. Both (a) and (b)
d. None of the above
A microprocessor with 12-bit address bus will be able to access kilobytes of
memory
A practical current source is usually represented by
A resistance in series with an ideal current source.
A resistance in parallel with an ideal current source.
A resistance in parallel with an ideal voltage source.
None of the above.
:
The dominant mode in a rectangular wave guide is TEo, because this mode has
a. No attenuation
b. No cut off
c. No magnetic field component
d. The highest cut-off wavelength
A PN junction in series with a 100 ohm resistor is forward biased so that a
current of 100 mA flows. If voltage across the combination is instantaneously
reversed to 10V at time t = 0, the reverse current that flows through the junction
at t = 0 is approximately given by.
a. 0 mA
b. 200 mA ------- ------------
c. 50 mA
d. 100 mA
Page 3 of 17
)
Page 3
TTELECTRoNics-2011 - - TSEE,
12.
13.
14.
15.
16.
17.
Ripple factor for a half wave rectifier is
1.65
1.45
}
1.21
is a primitive that can execute code. It contains an instruction
pointer (=program counter) and sometimes has its own stack
Process
Task
Kernel
Thread
:
If q and B are the roots of the equation x*-px+q = 0, then Xa is
p” +24
p + 2d
p’-24
p – 2d
:
A signal mi (t) is band limited to 3.6 kHz and the three other signals m2(t), m3(t)
and m4(t) are band limited to 1.2 kHz each, and these signals are transmitted by
means of TDM. Then, what will be the transmission bandwidth of the channel.
a. 7.2 KHz
b. 14.4 KHZ
c. 3.6 KHz
d. 2.4 KH

Attached Files

ISRO Question Paper for ECE.pdf (514.8 KB, 73 views)