'Barc Sample Paper\r'

'ELECTRONICS go www. ecatn. blog deformity. com BARC SAMPLE mind PAPER FOR ELECTRONICS If you like my site please make us by sharing website (www. ecatn. blogspot. com) to your fri curios 1. Differential amplifiers argon used in a. instrumentation amplifiers b. voltage chase c. voltage regulators d. buffers 2. The produce voltage Vo of the above tour of duty is a. -6V b. -5V c. -1. 2V d. -0. 2V 3. The ideal OP-AMP has the fol miserableing characteristics. a) Ri=? ,A=? ,R0=0 b) Ri=0 ,A=? ,R0=0 c) Ri=? ,A=? ,R0=? d) Ri=0 ,A=? ,R0=? ELECTRONICS biography www. ecatn. blogspot. com 4. . How many op-amps are need to implement this equation A. B. 3 C. 4 D. 1 5. A very brief, utmost voltage capitulum on an ac power line is called as A. A bleeder B. An arc C. A evanescent D. An avalanche E. A clipped peak 6. You depose find the zener junction rectifier in A. The mixer in a superheterodyne receiver B. The PLL in a locomote for detecting FM C. The product detector in a receiver fo r 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 separate 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 sensation port network having two inear comp wholenessnts. If the reliable finished the network is 0 for t<0 and decaysexponentially for t>0then the network consists of (A) R and L in serial (B)R and L in parallel (C)R and C in parallel (D)R and C in series ELECTRONICS CAREER www. ecatn. blogspot. com 9. The Q-factor of a parallel resonance duty tour consisting of an induction of value 1mH, capacitance of value 10-5F and a opponent of 100 ohms is (A) 1 (B)10 (C) ? 20 (D) 100 10. In a travelling electromagnetic prosper, E and H vector fields are (A) (B) (C) (D) perpendicular in space . parallel in space. E is in the direction of wave travel.H is in the direction of wave travel. 11. T he lower cut-off frequence of a rectangular wave guide with inside dimensions (3 ? 4. 5 cm) operate at 10 GHz is (A) 10 GHz. (B)9 GHz. (C) 10/9GHz. (D) 10/3GHz. 12. The built-in impedance of free space is (A) 75 ohm. (B)73 ohm. (C)120 ? ohm. (D)377ohm. 13. Which one of the following conditions lead not gurantee a aberrationless infection system line (A)R = 0 = G (B)RC = LG (C) very low frequency range (R>> ? L, G >> ? C) (D) very high frequency range (R<< ? L, G << ? C) 14. MOSFET can be used as a ELECTRONICS CAREER www. ecatn. blogspot. com a) current controlled capacitor (b) voltage controlled capacitor (c) current controlled inductor (d) voltage controlled inductors 15. In a common emitter, unbypassed antagonist provides (a)voltage shunt feedback (b)current series feedback (c)negative voltage feedback (d)positive current feedback 16. Introducing a electrical resistance in the emitter of a common amplifier stabilizes the dc operating point against variations in a) Only the temperature b) simply the ? of the transistor c) Both Temperature & ? d) None of the above 17. For the turn shown in Fig. 4, the voltage across the last resistor is V. All resistors are of ? 1 .The Vs is given by (A) 13V. (C) 4V. (B) 8V. (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 time- constant s, , ? the voltage across C at time ? = t is given by A. 10(1-e-1) v ELECTRONICS CAREER www. ecatn. blogspot. com B. 10(2-e-2) v C. 10-e-1 volts D. 1-e-1 20. A 2 port network use 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 he line is terminated at one end by +j50 ohms, the VSWR produced in the transmission line will be (A) +1 (C)infinity (B) zero (D)-1 22. In a current medium E = 10 Cos(108t †3y) ax V/m. What type of medium is it? (A) Free space (B)Lossy insulator (C)Lossless dielectric (D)Perfect conductor 23. If D ? ? =? ?. E and ?. J = ? ?. E in a given substantive, the material is said to be (A) running(a) (C) Isotropic (B)Homogeneous (D) Linear & Homogeneous 24. For a 300 ? antenna operating with 5A of current, the radiated power is (A) 7500 W (B) 750 W ELECTRONICS CAREER www. ecatn. blogspot. com (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 (c) 5/3 vo lts (b) 15 volts (d)5/2 volts 26. The early effect in a bipolar junction transistor is caused by (a) fast sit (b)fast turn-off (c) large collector-base reverse bias (d) large emitter-base foregoing bias 27. MOSFET can be used as a (a) current controlled capacitor (c) current controlled inductor (b) voltage controlled capacitor (d) voltage controlled indu ctors 28. An AM mansion is detected using an envelop detector. The mail carrier frequency and modulating signal frequencyare 1 megacycle per second and 2 kc respectively.An appropriate valuefor the time constant of the envelope detector is. (A) 500 µsec (C) 0. 2 µsec (B) 20 µsec (D) 1 µsec 29. An AM modulator has output x(t)=A cos400? t+Bcos 380? t +Bcos 420? t and The carrier power is 100 W and the efficiency is 40%. The value of A and B are (A) 14. 14, 8. 16 (C) 22. 36, 13. 46 (B) 50, 10 (D) None of the above ELECTRONICS CAREER www. ecatn. blogspot. com 30. A super heterodyne receiver is knowing to receive transmitted signals between 5 and 10 MHz. High-side tuning is to be used. The tuning range of the local anaesthetic oscillator for IF frequency 500 kHz would be (A) 4. 5 MHz †9. MHz (C) 4. 5 MHz †10. 5 MHz (B) 5. 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 (C) 6. 43 ms (B) 3. 47µs (D) 7. 86 ms 32. The minimum sampling frequency (in samples/sec) indispensable to reconstruct the following signal form its samples without distortion would be x(t)= 5(sin2? 1000t/? t)3 +7(sin 2? t 1000t/? t)2 (A)2×103 (C) 6×103 (B)4×103 (D) 8×103 33. Three identical amplifier, each having a spot effective input noise temperature of 125 K and available power G are cascaded.The general spot effective input noise temperature of the cascade is 155 K. The G is (A) 3 (C) 7 (B) 5 (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 ELECTRONICS CAREER www. ecatn. blogspot. com (A) (B) (C) (D) V02=v2 V01 V02=e2 V01 V02= V01ln2 V01- V02=Vt ln2 35. The restoration shown in fig. below is a (A) modernâ€8 up counter (B) MODâ€8 down counter (C) MODâ€6 up counter ( D) MODâ€6 down counter 36. The MUX shown in fig. multiplexer. The output Z is (A) A xor C (C) B xor C (B) A and C (D) B and C\r\n'