Analog Electronics MCQ Questions & Answers

41

Bootstrap voltage sweep generator uses

A) negative feedback B) positive feedback C) both negative and positive feedbacks simultaneously D) no feedback

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Answer & Solution

Answer: Option B

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42

Using the incremental low frequency small-signal model of the MOS device, the Norton equivalent resistance of the following circuit is
Analog Electronics mcq question image

A) $${{\text{r}}_{{\text{ds}}}} + {\text{R}} + {{\text{g}}_{\text{m}}}{{\text{r}}_{{\text{ds}}}}{\text{R}}$$ B) $${{\text{r}}_{{\text{ds}}}} + \frac{1}{{{{\text{g}}_{\text{m}}}}} + {\text{R}}$$ C) $${{\text{r}}_{{\text{ds}}}} + {\text{R}}$$ D) $$\frac{{{{\text{r}}_{{\text{ds}}}} + {\text{R}}}}{{1 + {{\text{g}}_{\text{m}}}{{\text{r}}_{{\text{ds}}}}}}$$

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Answer: Option D

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43

The approximate O/P Frequency of 555 Oscillator for R_A = R_B = 2.2 kΩ and C = 2000 pF-

A) 110 kHz B) 109.3 kHz C) 120.5 kHz D) 108.9 kHz

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Answer: Option B

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44

The current gain of a BJT is

A) $${{\text{g}}_{\text{m}}}{{\text{r}}_{\text{o}}}$$ B) $$\frac{{{{\text{g}}_{\text{m}}}}}{{{{\text{r}}_{\text{o}}}}}$$ C) $${{\text{g}}_{\text{m}}}{{\text{r}}_\pi }$$ D) $$\frac{{{{\text{g}}_{\text{m}}}}}{{{{\text{r}}_\pi }}}$$

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Answer: Option C

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45

The cascade amplifier is a multistage configuration of

A) CC-CB B) CE-CB C) CB-CC D) CE-CC

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Answer: Option D

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46

An OPAMP-based comparator drives an LED, with V_F = 1.6V, the current through which is regulated by a 1 kΩ resistor and a silicon diode in series. Assume a ±10V DC voltage is applied as ±V_CC respectively to the op-amp. Then find out the current through the LED when the comparator output is +10V.

A) 5.4 mA B) 8.5 mA C) 7.7 mA D) 6.7 mA

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Answer & Solution

Answer: Option C

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47

Blocking oscillators are used as

A) Abrut pulse generator B) Low impedance switches C) High impedance switches and frequency dividers D) None of the above

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Answer: Option C

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48

What is the formula of lower cut-off frequency of an RC coupled amplifier?

A) $${{\text{f}}_{\text{L}}} = \frac{1}{{2\pi {\text{RC}}}}$$ B) $${{\text{f}}_{\text{L}}} = \frac{\pi }{{2{\text{RC}}}}$$ C) $${{\text{f}}_{\text{L}}} = \frac{{\text{R}}}{{2\pi {\text{C}}}}$$ D) $${{\text{f}}_{\text{L}}} = \frac{{\text{C}}}{{2\pi {\text{R}}}}$$

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Answer: Option A

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49

A common emitter transistor amplifier has a collector load of 10 kΩ. If its h_fe = 100 and h_ie = 2 kΩ (h_re ≈ h_oe ≈ 0), the voltage amplification of the amplifier is nearly equal to

A) 500 B) 200 C) 100 D) 50

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Answer: Option A

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50

When the gate-to-source voltage (V_GS) of a MOSFET with threshold voltage of 400 mV, working in saturation is 900 mV, the drain current is observed to be 1 mA. Neglecting the channel length modulation effect and assuming that the MOSFET is operating at saturation, the drain current for an applied V_GS of 1400 mV is

A) 0.5 mA B) 2.0 mA C) 3.5 mA D) 4.0 mA

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Answer: Option D

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Analog Electronics MCQ Questions & Answers | ECE