Analog Electronics MCQ Questions & Answers

31

A monolithic metal oxide semiconductor (MOS) non-polarized capacitor which is a parallel plate capacitor with SiO₂ as dielectric. A surface thin film of metal (aluminum) is the top plate. The bottom plate consists of the heavily doped n* region that is formed during emitter diffusion. What is the typical value of capacitance for an oxide thickness of 500 Å of this MOS capacitor?
Take the permittivity of dielectric (ε_r) as 4.

A) 0.1 pF/mil² B) 0.2 pF/mil² C) 0.3 pF/mil² D) 0.4 pF/mil²

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Answer & Solution

Answer: Option D

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32

Which of the following holds FALSE for BJTs?

A) The quantity beta (β) provides an important relationship between the base and collector currents, and is usually between 50 and 400 B) The impedance between terminals of a forward-biased junction is always relatively large, whereas the impedance between terminals of a reverse-biased junction is usually quite small C) The dc beta is defined by a simple ratio of dc currents at an operating point D) The quantity alpha (α) relates the collector and emitter currents and is always close to one

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Answer & Solution

Answer: Option B

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33

In order to ensure that the output voltage of an op-amp is zero, when both its inputs are grounded

A) Internal negative feedback is used B) An external offset balancing circuit is used at the input terminals C) The currents incident at the output node are carefully designed D) The totem-pole output transistors are designed to have exactly equal cut in voltages

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Answer & Solution

Answer: Option B

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34

If α = 0.98, I_CO = 6 µA and I_B = 100 µA for a transistor, then the value of I_C will be

A) 2.3 mA B) 3.1 mA C) 4.6 mA D) 5.2 mA

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Answer & Solution

Answer: Option D

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35

The circuit of figure uses an ideal Op-Amp for small positive values of V_in, the circuit works as
Analog Electronics mcq question image

A) A half wave rectifier B) A differentiator C) A logarithmic amplifier D) An exponential amplifier

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Answer & Solution

Answer: Option C

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36

For a common emitter. BJT configuration with collector terminal resistance R, the slope of the D.C. load line can be given by:

A) 1 B) R C) 1/R D) -1/R

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Answer & Solution

Answer: Option D

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37

The value of h_FE (the hybrid parameters) of a Common-Emitter (CE) connection of a Bipolar Junction Transistor (BJT) is given as 250. What is the value of α_dc (ratio of collector current to emitter current), for this BJT?

A) 0.436 B) 0.656 C) 0.874 D) 0.996

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Answer & Solution

Answer: Option D

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38

Consider the following statements regarding an op-amp:
1. All types of negative feedback reduce nonlinear distortion.
2. All types of negative feedback reduce the output offset voltage.
3. Non-inverting (current and voltage) feedback increases the input impedance.
4. Inverting (current and voltage) feedback decreases input impedance.
Which of the above statements is/are correct?

A) 1 only B) 2 and 3 only C) 2 and 4 only D) 1, 2, 3 and 4

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Answer & Solution

Answer: Option D

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39

For the operational amplifier circuit shown, the output saturation voltages are ±15 V. The upper and lower threshold voltages for the circuit are, respectively,
Analog Electronics mcq question image

A) +5 V and -5 V B) +7 V and -3 V C) +3 V and -7 V D) +3 V and -3 V

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Answer & Solution

Answer: Option B

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40

In the given block diagram, which is the sampling element?
Analog Electronics mcq question image

A) Voltage divider using R₁ and R₂ B) Transistor Q₂ C) Op-amp D) R₃ and Zener diode

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Answer & Solution

Answer: Option A

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Analog Electronics MCQ Questions & Answers | ECE