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  • Question

  • The amplifier circuit shown below uses a silicon transistor. The capacitors Cc and CE can be assumed to be short at signal frequency and the effect of output resistance r0 can be ignored. If CE is disconnected from the circuit, which one of the following statements is TRUE?
    The amplifier circuit shown below uses a silicon transistor. The capacitors Cc and CE can be assumed


  • Options
  • A. The input resistance Ri increases and the magnitude of voltage gain Av decreases
  • B. The input resistance Ri decreases and the magnitude of voltage gain Av decreases
  • C. Both input resistance Ri and the magnitude of voltage gain Av decrease
  • D. Both input resistance Ri and the magnitude of voltage gain Av increase

  • Correct Answer
  • The input resistance Ri increases and the magnitude of voltage gain Av decreases 

    Explanation
    Given circuit after removing CE will behave as current-series feedback.

    Overall voltage gain will decrease as feedback signal comes into picture and since it is current-series feedback, input impedance increases.

    More questions

    • 1. In which region of a CE bipolar transistor is collector current almost constant?

    • Options
    • A. Saturation region
    • B. Active region
    • C. Breakdown region
    • D. Both saturation and active region
      • Discuss
    • 2. The Q factor of a waveguide resonator is given by (?0 is resonant frequency, U is energy storage and WL is the power loss)

    • Options
    • A.
    • B.
    • C. Q = ?0UWL
    • D.
      • Discuss
    • 3. In a resistance strain gauge, G = 2, stress = 1050 kg/cm2, R = 1000 ?. The value of ?R will be

    • Options
    • A. 2 ?
    • B. 3 ?
    • C. 4 ?
    • D. 1 ?
      • Discuss
    • 4. In a broadcast superheterodyne receiver

    • Options
    • A. the local oscillator operates below the signal frequency
    • B. local oscillator frequency is normally double the IF
    • C. RF amplifier normally works at kHz above the carrier frequency
    • D. mixer input must be tuned to the signal frequency
      • Discuss
    • 5. FM receivers using the standard 88 to 108 MHz band use IF of

    • Options
    • A. 8 MHz
    • B. 9.9 MHz
    • C. 10.7 MHz
    • D. 12.2 MHz
      • Discuss
    • 6. Which one of the following potential does not satisfy Laplace's equations?

    • Options
    • A. v = 10 xy
    • B. v = p cos ?
    • C.
    • D. v = f cos ? + 10
      • Discuss
    • 7. The rate at which information can be carried through a communication channel depends on

    • Options
    • A. carrier frequency
    • B. bandwidth
    • C. transmission loss
    • D. transmitted power
      • Discuss
    • 8. Generally the wall thickness of rectangular waveguide is

    • Options
    • A. about 1-5 mils
    • B. about 40-100 mils
    • C. about 0.1 to 0.5 mils
    • D. about 500 mils
      • Discuss
    • 9. It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude

    • Options
    • A. will increase
    • B. will decrease
    • C. will remain constant
    • D. will reduce to negligible value
      • Discuss
    • 10. Curie Weiss law is .

    • Options
    • A. True
    • B. False
      • Discuss

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