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  #2  
July 3rd, 2014, 02:15 PM
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Join Date: Mar 2012
Re: Bhabha Atomic Research Centre past year question papers

As you want to get the Bhabha Atomic Research Centre past year question papers so here is the information of the same for you:

Some content of the file has been given here:

1. Differential amplifiers are used in
a. instrumentation amplifiers
b. voltage followers
c. voltage regulators
d. buffers
2.
The output voltage Vo of the above circuit is
a. -6V
b. -5V
c. -1.2V
d. -0.2V
3. The ideal OP-AMP has the following characteristics.
a) Ri=∞ ,A=∞ ,R0=0
b) Ri=0 ,A=∞ ,R0=0
c) Ri=∞ ,A=∞ ,R0=∞
d) Ri=0 ,A=∞ ,R0=∞
4. . How many op-amps are required to implement this equation
A. 2
B. 3
C. 4
D. 1
5. A very brief, high voltage spike on an ac power line is called as
A. A bleeder
B. An arc
C. A transient
D. An avalanche
E. A clipped peak
6. You can find the zener diode in
A. The mixer in a superheterodyne receiver
B. The PLL in a circuit for detecting FM
C. The product detector in a receiver for SSB
D. The voltage regulator in a power supply
E. The AF oscillator in an AFSK transmitter
7. A network function can be completely specified by:
(A) Real parts of zeros
(B)Poles and zeros
(C)Real parts of poles
(D)Poles, zeros and a scale factor
8. A unit impulse voltage is applied to one port network having two
linear components. If the current through the network is 0 for t<0 and
decaysexponentially for t>0then the network consists of
(A) R and L in series
(B)R and L in parallel
(C)R and C in parallel
(D)R and C in series
9. The Q-factor of a parallel resonance circuit consisting of an inductance
of value 1mH, capacitance of value 10-5F and a resistance of 100 ohms
is
(A) 1
(B)10
(C) π 20
(D) 100
10. In a travelling electromagnetic wave, E and H vector fields are
(A) perpendicular in space .
(B) parallel in space.
(C) E is in the direction of wave travel.
(D) H is in the direction of wave travel.
11. The lower cut-off frequency of a rectangular waveguide with inside
dimensions (3 × 4.5 cm) operating at 10 GHz is
(A) 10 GHz.
(B)9 GHz.
(C) 10/9GHz.
(D) 10/3GHz.
12. The intrinsic impedance of free space is
(A) 75 ohm.
(B)73 ohm.
(C)120 π ohm.
(D)377ohm.
13. Which one of the following conditions will not gurantee a
distortionless transmission line
(A)R = 0 = G
(B)RC = LG
(C) very low frequency range (R>> ω L, G >> ω C)
(D) very high frequency range (R<< ω L, G << ω C)
14. MOSFET can be used as a
(a) current controlled capacitor (b) voltage controlled capacitor
(c) current controlled inductor (d) voltage controlled inductors
15. In a common emitter, unbypassed resister provides
(a)voltage shunt feedback (b)current series feedback
(c)negative voltage feedback (d)positive current feedback
16. Introducing a resistor in the emitter of a common amplifier stabilizes
the dc operating point against variations in
a) Only the temperature b) only the β of the transistor
c) Both Temperature & β d) None of the above
17. For the circuit shown in Fig.4, the voltage across the last resistor is V.
All resistors are of Ω 1 . The Vs is given by
(A) 13V. (B) 8V.
(C) 4V. (D)1V.
18. The network has a network function Z(s)=s(s+2)/(s+3)(s+4)
(A)not a positive real function. (B)RL network.
(C) RC network. (D)LC network.
19. For a series R-C circuit excited by a d-c voltageof 10V, and with timeconstant
s, , τ the voltage across C at time τ = t is given by
A. 10(1-e-1) v
B. 10(2-e-2) v
C. 10-e-1 volts
D. 1-e-1
20. A 2 port network using Z parameter representation is said to be
reciprocal if
A. Z11 =Z22
B. Z12 =Z21
C. Z12 = - Z21
D. Z11 – 2Z22 =0
21. Consider a transmission line of characteristic impedance 50 ohms and
the line is terminated at one end by +j50 ohms, the VSWR produced in
the transmission line will be
(A) +1 (B)zero
(C)infinity (D)-1
22. In a certain medium E = 10 Cos(108t – 3y) ax V/m. What type of
medium is it?
(A) Free space (B)Lossy dielectric
(C)Lossless dielectric (D)Perfect conductor
23. If D ⋅ ∇ =∈ ∇.E and ∇.J = σ ∇.E in a given material, the material is
said to be
(A) Linear (B)Homogeneous
(C) Isotropic (D) Linear & Homogeneous
24. For a 300 Ω antenna operating with 5A of current, the radiated power
is
(A) 7500 W (B) 750 W
(C)75 W (D)7500 mW
25. An OPAMP has a slew rate of 5 V/µ S .The largest sine wave O/P
voltage possible at a frequency of 1MHZ is
(a) 10 volts (b) 15 volts
(c) 5/3 vo lts (d)5/2 volts
26. The early effect in a bipolar junction transistor is caused by
(a) fast turn-on (b)fast turn-off
(c) large collector-base reverse bias (d) large emitter-base forward
bias
27. MOSFET can be used as a
(a) current controlled capacitor (b) voltage controlled capacitor
(c) current controlled inductor (d) voltage controlled inductors
28. An AM signal is detected using an envelop detector.The carrier
frequency and modulating signal frequencyare 1 MHz and 2 kHz
respectively. An appropriate valuefor the time constant of the envelope
detector is.
(A) 500 µsec (B) 20 µsec
(C) 0.2 µsec (D) 1 µsec
29. An AM modulator has output x(t)=A cos400πt+Bcos 380πt +Bcos
420πt and The carrier power is 100 W and the efficiency is 40%. The
value of A and B are
(A) 14.14, 8.16 (B) 50, 10
(C) 22.36, 13.46 (D) None of the above
30. A super heterodyne receiver is designed to receive transmitted signals
between 5 and 10 MHz. High-side tuning is to be used. The tuning
range of the local oscillator for IF frequency 500 kHz would be
(A) 4.5 MHz - 9.5 MHz (B) 5.5 MHz - 10.5 MHz
(C) 4.5 MHz - 10.5 MHz (D) none of these
31. An analog signal is sampled at 36 kHz and quantized into 256 levels.
The time duration of a bit of
the binary coded signal is:
(A) 5.78µs (B) 3.47µs
(C) 6.43 ms (D) 7.86 ms
32. The minimum sampling frequency (in samples/sec) required to
reconstruct the following signal form its samples without distortion
would be x(t)= 5(sin2π1000t/πt)3 +7(sin 2πt 1000t/πt)2
(A)2x103 (B)4x103
(C) 6x103 (D) 8x103
33. Three identical amplifier, each having a spot effective input noise
temperature of 125 K and available power G are cascaded. The overall
spot effective input noise temperature of the cascade is 155 K. The G is
(A) 3 (B) 5
(C) 7 (D) 9
34. In the Op-Amp circuit shown, assume that the diode current follows
the equation I=Isexp(V/Vt) Vi=2V , Vo =V01 and for Vi=4V , Vo =V02
The relationship between V01 andV02 is

(A) V02=√2 V01
(B) V02=e2 V01
(C) V02= V01ln2
(D) V01- V02=Vt ln2
35. The counter shown in fig. below is a
(A) MOD–8 up counter
(B) MOD–8 down counter
(C) MOD–6 up counter
(D) MOD–6 down counter
36. The MUX shown in fig. multiplexer. The output Z is
(A) A xor C (B) A and C
(C) B xor C (D) B and C





For more detailed information I am uploading a PDF file which is free to download:



Contact Details:
Bhabha Atomic Research Centre
Trombay,
Mumbai,
Maharashtra 400085 ‎
022 2550 5050
India

Map Location:
  #3  
March 23rd, 2015, 09:55 PM
Unregistered
Guest User
 
Re: Bhabha Atomic Research Centre past year question papers

Hi,

I am not able to download the pdf provided by you.
Can anyone please provide me previous papers of BARC for ECE Stream to my mail ID - ananth.ra999@gmail.com.

Thanks in Advance.


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