#1
14th August 2015, 10:59 AM
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BARC Placement Papers for Electronics
Hello sir would you please provide me BARC Placement Papers for Electronics because I have done B.E in electronics & telecom….
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#2
14th August 2015, 11:14 AM
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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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