R.V.C.E - Electronics And Communication Technical Test - 1

40 Questions | Total Attempts: 154

SettingsSettingsSettings
R.V.C.E - Electronics And Communication Technical Test - 1 - Quiz


Questions and Answers
  • 1. 
    For a three-input OR gate, with the input waveforms as shown below, which output waveform, is correct?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 2. 
    Which of the figures in figure (a to d) is equivalent to figure (e)?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 3. 
    How many Flip-Flops are required for a mod-16 counter?
    • A. 

      5

    • B. 

      6

    • C. 

      3

    • D. 

      4

  • 4. 
    The digital logic family which has minimum power dissipation is
    • A. 

      TTL

    • B. 

      RTL

    • C. 

      DTL

    • D. 

      CMOS

  • 5. 
    Which of the following is the fastest logic
    • A. 

      TTL

    • B. 

      ECL

    • C. 

      CMOS

    • D. 

      LSI

  • 6. 
    If the input to T-flipflop is 100 Hz signal, the final output of the three T-flipflops in cascade is
    • A. 

      100 HZ

    • B. 

      500 HZ

    • C. 

      333 HZ

    • D. 

      12.5 HZ

  • 7. 
    The result of adding hexadecimal number A6 to 3A is
    • A. 

      DD

    • B. 

      E0

    • C. 

      F0

    • D. 

      EF

  • 8. 
    The Intel’s 8051 machine cycle width is 12 oscillator clock cycles. This is because,
    • A. 

      Minimum time taken to execute any 8051 instruction is 12 clock cycles.

    • B. 

      Maximum time taken to execute any 8051 instruction is 12 clock cycles.

    • C. 

      To generate standard baud rates

    • D. 

      None of these

  • 9. 
    A ring counter consisting of five Flip-Flops will have
    • A. 

      5 States

    • B. 

      10 States

    • C. 

      32 States

    • D. 

      Infinite States

  • 10. 
    In successive-approximation A/D converter, offset voltage equal to  ½ LSB is added to the D/A converter’s output. This is done to
    • A. 

      Improve the speed of operation.

    • B. 

      Reduce the maximum quantization error.

    • C. 

      Increase the number of bits at the output

    • D. 

      Increase the range of input voltage that can be converted

  • 11. 
    Consider a CMOS process for which tox = 15nm, μp = 350 cm2/V.s, and Vt = 0.7V. Its K`p = ________.
    • A. 

      20.65 µA/V2

    • B. 

      80.50 µA/V2

    • C. 

      59.88 µA/V2

    • D. 

      NONE

  • 12. 
    Unity gain frequency of MOSFET is 60 MHz.  It has internal capacitances, Cgs = 1.8 pF, Cgd = 0.7 pF. Its gm = ____________.
    • A. 

      150 µA/V

    • B. 

      66 µA/V

    • C. 

      0.414 mA/V

    • D. 

      0.942 mA/V

  • 13. 
    The time constant of the output waveform for the circuit shown in Fig, = __________, when a step input voltage is applied at the input port
    • A. 

      0.02

    • B. 

      0.01482

    • C. 

      0.07

    • D. 

      None

  • 14. 
    The value of RE = _____________. Assume VBE = 0.7V at 1 mA.
    • A. 

      11.96 kΩ

    • B. 

      1.196 kΩ

    • C. 

      5.98 kΩ

    • D. 

      59.8 kΩ

  • 15. 
    For the circuit the output voltage = _____________.
    • A. 

      -4 V

    • B. 

      12 V

    • C. 

      -16 V

    • D. 

      8 V

  • 16. 
    Avalanche breakdown results basically due to ________.
    • A. 

      Impact ionisation

    • B. 

      Strong electric field across the junction

    • C. 

      Emission of electrons

    • D. 

      Rise in temperature

  • 17. 
    In a transistor if β changes from 99 to 199, then α changes from [Blank] to [Blank]
  • 18. 
    An amplifier without feedback has a gain of 100, and a distortion of 10%. The distortion needs to be reduced to 4% by providing suitable negative feedback. The amount of feedback should be =[Blank]%
  • 19. 
    An FM wave is represented by VFM(t)=20 sin(2π x 106t+ 5 sin 2π x 104t). The bandwidth required =[Blank]KHz
  • 20. 
    (1999) in Decimal=([Blank]) in Binary
  • 21. 
    The analog signal in Q1 is sampled at the rate of 8,000 Hz, the sampled signal spectrum and its replicas centered at the frequencies __________
    • A. 

      ± nfs

    • B. 

      -nfs

    • C. 

      +nfs

    • D. 

      Fs

  • 22. 
    The condition of the Shannon sampling theorem for practical signal reconstruction is
    • A. 

      F s < 2f max

    • B. 

      F s > 2f max

    • C. 

      F s = 2f max

    • D. 

      None

  • 23. 
    Assuming that a 3-bit ADC channel accepts analog input ranging from 0 to 5 volts, determine the following: a. number of quantization levels  b. step size of the quantizer or resolution
    • A. 

      3 and 1.667

    • B. 

      3 and 0.625

    • C. 

      8 and 0.625

    • D. 

      8 and 1.667.

  • 24. 
    The z-transform of the sequence defined by x(n) = u(n) – (0.5)n * u(n):
    • A. 

      z/(z-1)

    • B. 

      Z/(z-0.5)

    • C. 

      [z/(z-1) ] - [z/(z-0.5)]

    • D. 

      U (Z) – (0.5)n U (Z)

  • 25. 
    1000 KHz carrier is modulated by 300 Hz audio sine wave.  What will be the frequency present in the output?
    • A. 

      1000.3 KHz, 999.7 KHz

    • B. 

      2000.3 KHz, 999.3 KHz

    • C. 

      1500.3 KHz, 959.7 KHz

    • D. 

      1000.3 KHz, 987.5 KHz

Back to Top Back to top