ইলেকট্রনিক ডিভাইস এন্ড সার্কিট

  • ০০। is ________ than in a common-base configuration.
    • ক) significantly smaller
    • খ) smaller
    • গ) significantly greater
    • ঘ) None of the above
  • ০১। αDC=IEIC
    • ক) True
    • খ) False
  • ০২। A 3-dB drop in hfe will occur at a frequency defined by ________.
    • ক) fα
    • খ) fβ
    • গ) 1
    • ঘ) 2
  • ০৩। A 311 IC is an example of an eight-pin DIP that can be made to function as a ________.
    • ক) comparator
    • খ) 555 timer
    • গ) D to A converter
    • ঘ) ladder network
  • ০৪। A 339 IC is an example of a fourteen-pin DIP that can be made to function as a ________.
    • ক) comparator
    • খ) 555 timer
    • গ) D to A converter
    • ঘ) ladder network
  • ০৫। A 35 mV signal is applied to the base of a properly biased transistor with an r'e = 8 and RC = 1 k. The output signal voltage at the collector is:
    • ক) 3.5 V
    • খ) 28.57 V
    • গ) 4.375 mV
    • ঘ) 4.375 V
  • ০৬। A 6.2 V zener is rated at 1 watt. The maximum safe current the zener can carry is
    • ক) 1.61 A.
    • খ) 161 mA.
    • গ) 16.1 mA.
    • ঘ) 1.61 mA.
  • ০৭। A balanced modulator is used in standard AM to obtain the sum and difference frequencies.
    • ক) True
    • খ) False
  • ০৮। A band-pass filter can be created by cascading a high-pass filter and a low-pass filter.
    • ক) True
    • খ) False
  • ০৯। A band-pass filter passes all frequencies within a band between a lower and an upper cutoff frequency.
    • ক) True
    • খ) False
  • ১০। A bandpass filter uses ________ circuit.
    • ক) a high-pass
    • খ) a low-pass
    • গ) a high-pass and a low-pass
    • ঘ) neither a low-pass nor a high-pass
  • ১১। A basic voltage regulator consists largely of a reference source, an error detector, and a control device.
    • ক) True
    • খ) False
  • ১২। A basic ________ amplifier is formed by three op-amps and seven resistors.
    • ক) instrumentation
    • খ) isolation
    • গ) log
    • ঘ) antilog
  • ১৩। A BJT consists of three regions: base, emitter, and collector.
    • ক) True
    • খ) False
  • ১৪। A BJT has an IB of 50 A and a DC of 75; IC is:
    • ক) 375 mA
    • খ) 37.5 mA
    • গ) 3.75 mA
    • ঘ) 0.375 mA
  • ১৫। A BJT is a ________ controlled device.
    • ক) current
    • খ) voltage
  • ১৬। A BJT is a ________ controlled device. The JFET is a ________ controlled device.
    • ক) voltage, voltage
    • খ) voltage, current
    • গ) current, voltage
    • ঘ) current, current
  • ১৭। A certain amplifier has a bandwidth of 22.5 kHz with a lower cutoff frequency of 600 Hz. What is the value of fcu?
    • ক) 600 Hz
    • খ) 22.5 kHz
    • গ) 23.1 kHz
    • ঘ) 21.9 kHz
  • ১৮। A certain fiber-optic cable has the following characteristics: n1 = 1.82 and n2 = 1.73. What is the value of θc?
    • ক) 71.90º
    • খ) 0.95º
    • গ) 18.1º
    • ঘ) 1.81º
  • ১৯। A certain op-amp has an open-loop voltage gain of 150,000. What is this gain expressed in dB?
    • ক) 51.7 dB
    • খ) 103.5 dB
    • গ) 150,000 dB
    • ঘ) 5.18 dB
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