Analog Electronics MCQs
Practice and Learn through MCQs and Quizzes. W3Definitions.com have 219 Analog Electronics MCQs
2N 2430 could be a
- A. semi-conductor diode
- B. dual gate MOSFET
- C. BJT
- D. UJT
- Correct Answer: Option C
3N 200 is a
- A. semi-conductor diode
- B. P-N-P transistor
- C. dual gate MOSFET
- D. UJT
- Correct Answer: Option C
A boot strap generally incorporates
- A. CB configuration
- B. CE configuration
- C. emitter follower
- D. none of the above
- Correct Answer: Option A
A cascade amplifier will have higher cut off frequency
- A. equal to that of single stage amplifier
- B. less than that of single stage amplifier
- C. more than that of single stage amplifier
- D. none of these
- Correct Answer: Option B
A Darlington circuit is obtained by connecting
- A. two CB stages in cascade
- B. two CE stages in cascade
- C. a CE stages followed by CB stage
- D. two emitter follower in cascade
- Correct Answer: Option A
A delay equalizer is a
- A. low pass filter
- B. band pass filter
- C. all pass filter
- D. high pass filter
- Correct Answer: Option B
A feedback network to be used with an amplifier to provide oscillation is tested and found to give an output of 0.124 V with a 0.5 V input. What must be the minimum gain of the oscillator to provide oscillations?
- A. 40
- B. 60
- C. 100
- D. 130
- Correct Answer: Option A
A feedback network to be used with an amplifier to provide oscillation is tested and found to give an output of 0.124 V with a 0.5 V input. What percentage negative feedback should be introduced to the amplifier so that linear oscillations result?
- A. 1.25%
- B. 2.50%
- C. -1.25%
- D. -2.5%
- Correct Answer: Option C
A feedback network to be used with an amplifier to provide oscillation is tested and found to give an output of 0.124 V with a 0.5 V input. What will be the effect on output if the amplifier’s gain is twice that required by the Barkhausen criterion?
- A. Linear oscillations
- B. Non-linear oscillations
- C. Damped oscillations
- D. No oscillations
- Correct Answer: Option D
A FET
- A. has two P-N junctions
- B. has three P-N junctions
- C. depends on the variation of the depletion layer width with reverse voltage, for its operation
- D. depends on the variation of a magnetic field for its operation
- Correct Answer: Option B
A FET is a __________ controlled device whereas a bipolar transistor is a __________ controlled device.
- A. gate, drain
- B. drain, gate
- C. current, voltage
- D. voltage, current
- Correct Answer: Option D
A generator with an internal resistance of 600 Ω drives an amplifier whose input resistance is 400 Ω. The generator’s open circuit voltages is 1 mV; the amplifier develops 100mV across an 8kΩ load. The current amplification is
- A. 2.5
- B. 12.5
- C. 25
- D. 125
- Correct Answer: Option B
A generator with an internal resistance of 600 Ω drives an amplifier whose input resistance is 400 Ω. The generator’s open circuit voltages is 1 mV; the amplifier develops 100mV across an 8kΩ load. The input voltage to the amplifier is
- A. 0.1 m V
- B. 0.4 m V
- C. 1 m V
- D. 4 m V
- Correct Answer: Option B
A generator with an internal resistance of 600 Ω drives an amplifier whose input resistance is 400 Ω. The generator’s open circuit voltages is 1 mV; the amplifier develops 100mV across an 8kΩ load. The power gain is
- A. 125
- B. 250
- C. 1125
- D. 3125
- Correct Answer: Option D
A generator with an internal resistance of 600 Ω drives an amplifier whose input resistance is 400 Ω. The generator’s open circuit voltages is 1 mV; the amplifier develops 100mV across an 8kΩ load. The voltage multiplication is
- A. 25
- B. 50
- C. 125
- D. 250
- Correct Answer: Option D
A Hartley oscillator uses
- A. a tapped capacitor
- B. a tapped inductor
- C. a tapped inductor for inductive feedback
- D. none of the above
- Correct Answer: Option C
A JFET can operate on
- A. enhancement mode only
- B. depletion mode only
- C. both depletion as well as enhancement modes
- D. neither depletion nor enhancement mode
- Correct Answer: Option B
A JFET is a
- A. unipolar device
- B. bipolar device
- C. tripolar device
- D. none of the above
- Correct Answer: Option A
A major advantage of TWT over a Klystron lies in its
- A. higher bandwidth
- B. higher gain
- C. higher frequency
- D. higher output
- Correct Answer: Option B
A multivibrator can be used as a
- A. cavity resonator
- B. harmonic generator
- C. wave form modifier
- D. any of the above
- Correct Answer: Option C
A multivibrator generates
- A. sinusoidal waveforms
- B. non-sinusoidal waveforms
- C. both (a) and (b)
- D. none of the above
- Correct Answer: Option A
A pulse transformer uses
- A. ferrite core
- B. air core
- C. iron core
- D. copper core
- Correct Answer: Option A
A push pull amplifier balance out
- A. odd harmonics
- B. even harmonics
- C. both odd as well as even harmonics
- D. neither odd nor even harmonics
- Correct Answer: Option A
A radio frequency choke permits an easy flow of __________ current and at the same time it offers a very impedance to __________ currents.
- A. A.C., low frequency
- B. A.C., high frequency
- C. D.C., low frequency
- D. D.C. high frequency
- Correct Answer: Option D
A sine wave is passed through an amplifier which severely limits it symmetrically. If then passes to a second amplifier which is narrow band and tuned to the frequency of the original sine wave. What will be the output wave from this second amplifier?
- A. A square wave of the same frequency as that of the original sine wave
- B. A square wave of double the frequency of that of original sine wave
- C. A sine wave of constant amplitude at the frequency of the original sine wave
- D. A sine wave of constant amplitude at double frequency of the original sine wave
- Correct Answer: Option C
A three-section RC phase shift oscillator has R = 10K ohms and C = 0.001 μF. If the oscillator is to be made variable using the same value of R, what should be the value of capacitor to obtain a frequency if 1 kHz?
- A. 636 pF
- B. 180 pF
- C. 65 pF
- D. 30 pF
- Correct Answer: Option C
A three-section RC phase shift oscillator has R = 10K ohms and C = 0.001 μF. The frequency of oscillations is
- A. 1.1 kHz
- B. 2.5 kHz
- C. 3.3 kHz
- D. 6.5 kHz
- Correct Answer: Option D
A transistor amplifier with 85% efficiency is expected to be
- A. class A
- B. class B
- C. class C
- D. class AB
- Correct Answer: Option C
A transistor is said to be in a quiescent state when
- A. the amplitude of input and output signal is equal
- B. the phase of input and output signal is identical
- C. no signal is applied to the input
- D. the transistor is unbiased
- Correct Answer: Option C
A Weinbridge oscillator is a
- A. VHF oscillator
- B. RF oscillator
- C. microwave oscillator
- D. audio frequency oscillator
- Correct Answer: Option D
According to Barkhausen criteria in order to sustain the oscillations
- A. loop gain of the circuit must be negligible
- B. loop gain of the circuit must be equal to unity
- C. the phase shift around the circuit must be 180°
- D. none of the above
- Correct Answer: Option C
An amplifier signal is made up of just two frequencies 1000 Hz. The output signal consists of 500 Hz and 25000 Hz frequencies. This may be attributed to
- A. harmonic distortion
- B. intermodulation distortion
- C. both (a) and (b)
- D. none of the above
- Correct Answer: Option B
An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. How much feedback should be used to provide the desired level?
- A. +0.03%
- B. +0.33%
- C. +1.30%
- D. +3.3%
- Correct Answer: Option B
An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. What percentage of feedback will cause oscillations?
- A. 0.1%
- B. 0.5%
- C. 1%
- D. 2%
- Correct Answer: Option D
An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. What value of feedback will double the gain?
- A. +0.5%
- B. +0.66%
- C. +1%
- D. +3.3%
- Correct Answer: Option C
An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. Which of the following will increases from this type of operation?
- A. Stability
- B. Bandwidth
- C. Distortion
- D. Input resistance
- Correct Answer: Option C
An ideal voltage amplifier should have
- A. low input impedance and high output impedance
- B. high input impedance and low output impedance
- C. high input impedance and high output impedance
- D. low input impedance and low output impedance
- Correct Answer: Option B
As compared to a bipolar transistor, a JFET is
- A. highly sensitive to changes in input voltage
- B. more sensitive to changes in input voltage
- C. less sensitive to changes in input voltage
- D. equally sensitive to changes in input voltage
- Correct Answer: Option C
Assertion (A): A class C amplifier can also be used as frequency multiplierReason (R): When narrow current pulses drive a resonant circuit the output can be a near perfect sine wave
- A. Both A and R are correct and R is correct explanation for A
- B. Both A and R are correct but R is not correct explanation for A
- C. A is correct R is wrong
- D. A is wrong R is correct
- Correct Answer: Option B
Assertion (A): A class C amplifier is a timed amplifier which needs a tank circuit as the load in the collector circuit of the transistor for its proper operationReason (R): In class C operation collector current flows for less than 180° of the ac cycle and thus flows in pulses
- A. Both A and R are correct and R is correct explanation for A
- B. Both A and R are correct but R is not correct explanation for A
- C. A is correct R is wrong
- D. A is wrong R is correct
- Correct Answer: Option A