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14th August 2015, 11:14 AM
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Join Date: May 2012
Re: BARC Placement Papers for Electronics

Hello friend, here I am providing you BARC Electronics and electrical Placement Question papers, please have a look……

1 Differential amplifiers are used in
a. instrumentation amplifiers
b. voltage followers
c. voltage regulators
d. buffers

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 10-5 F 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 wave guide 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 guarantee a distortion less 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

1 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

2 In a certain medium E = 10 Cos(108t–3y) a xV/m. What type of medium is it?
(A) Free space
(B)Lossy dielectric
(C)Lossless dielectric
(D)Perfect conductor


3 If D⋅∇=∈∇.Eand∇.J = σ∇.Ein a given material, the material is said to be
(A) Linear
(B)Homogeneous
(C) Isotropic
(D) Linear & Homogeneous

4 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

5. 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

6 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

7 MOSFET can be used as a
(a) current controlled capacitor
(b) voltage controlled capacitor
(c) current controlled inductor
(d) voltage controlled inductors

8 An AM signal is detected using an envelop detector. The carrier frequency and modulating signal frequency are 1MHz and 2 kHz respectively. An appropriate value for the time constant of the envelope
detector is.
(A) 500 μsec
(B) 20 μsec
(C) 0.2 μsec
(D) 1μ sec

9 An AM modulator has output x(t)=A cos400 πt+Bcos 380 πt +Bcos420πt 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

10 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

11 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

12 The minimum sampling frequency (in samples/sec) required to reconstruct the following signal form its samples without distortion would be x(t)= 5(sin2 π 1000t/πt)3 +7(sin 2πt 1000t/πt)2
(A)2x103
(B)4x103
(C) 6x103
(D) 8x103

13 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 Gis
(A) 3
(B) 5
(C) 7
(D) 9


15 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

16 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


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