NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Electronics MCQs (Practice_Test 1 of 13)
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- Removing bypass capacitor across the emitter leg resistor in a CE amplifier causes
- increase in current gain
- decrease in current gain
- increase in voltage gain
- decrease in voltage gain
- Answer: d
- The minimum number of flip-flops required to construct a mod-75 counter is
- 5
- 6
- 7
- 8
- Answer: c
- The important characteristic of emitter-follower is
- High input impedance and high output impedance
- High input impedance and low output impedance
- Low input impedance and low output impedance
- Low input impedance and high output impedance
- Answer: b
- When an amplifier is provided with current series feedback, its
- Input impedance increases and output impedance decreases
- Input and output impedance both decrease
- Input impedance decreases and output impedance increases
- Input and output impedance both increase
- Answer: d
- The frequency of oscillation of a tunnel-collector oscillator having L = 30µH and C = 300pf is nearby
- 267 kHz
- 1677 kHz
- 1.68 kHz
- 2.67 kHz
- Answer: b
- The control terminal (pin 5) of 555 timer IC is normally connected to ground through a capacitor (0.01µF) . This is to
- Protect the IC from inadvertent application of high voltage
- Prevent false triggering by noise coupled onto the pin
- Convert the trigger input to sharp pulse by differentiation
- Suppress any negative triggering pulse
- Answer: b
- The fan out of a MOS logic gate is higher than that of TTL gates because of its
- Low input impedance
- high output impedance
- Low output impedance
- High input impedance
- Answer: d
- The common collector amplifier is also known as
- Collector follower
- Base follower
- Emitter follower
- Source follower
- Answer: c
- In class-A amplifier, the output current flows for
- A part of the cycle or the input signal
- The full cycle of the input signal
- Half the cycle of the input signal
- th of the cycle of the input signal
- Answer: b
- In an amplifier with negative feedback
- Only the gain of the amplifier is affected
- Only the gain and bandwidth of the amplifier are affected
- Only the input and output impedance are affected
- All of the four parameters mentioned above would be affected
- Answer: d