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০০। is ________ than in a common-base configuration.
- ক) significantly smaller
- খ) smaller
- গ) significantly greater
- ঘ) None of the above
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০২। A 3-dB drop in hfe will occur at a frequency defined by ________.
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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
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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
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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
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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.
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০৭। A balanced modulator is used in standard AM to obtain the sum and difference frequencies.
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০৮। A band-pass filter can be created by cascading a high-pass filter and a low-pass filter.
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০৯। A band-pass filter passes all frequencies within a band between a lower and an upper cutoff frequency.
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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
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১১। A basic voltage regulator consists largely of a reference source, an error detector, and a control device.
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১২। A basic ________ amplifier is formed by three op-amps and seven resistors.
- ক) instrumentation
- খ) isolation
- গ) log
- ঘ) antilog
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১৩। A BJT consists of three regions: base, emitter, and collector.
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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
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১৫। A BJT is a ________ controlled device.
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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
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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
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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
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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