OP Amp MCQ Questions & Answers | Electrical Engineering

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An opamp has a slew rate of 5 V/μS. The largest sine wave output voltage possible at a frequency of 1MHz is

A) $$\frac{5}{{2\prod }}{\text{V}}$$ B) $$5{\text{V}}$$ C) $$\frac{5}{\prod }{\text{V}}$$ D) $$10\pi {\text{V}}$$

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Answer & Solution

Answer: Option A

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The closed-loop voltage gain of an inverting amplifier equal to

A) The ratio of the input resistance to feedback resistance B) The open-loop voltage gain C) The feedback resistance divided by the input resistance D) The input resistance

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Answer & Solution

Answer: Option C

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Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is

A) 1 B) 2000 C) 80 dB D) 100000

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Answer & Solution

Answer: Option D

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If ground is applied to the (+) terminal of an inverting OP-amp, the (–) terminal will

A) Not need an input resistor B) Be virtual ground C) Have high reverse current D) Not invert the signal

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Answer & Solution

Answer: Option B

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A certain inverting amplifier has a closed-loop voltage gain of 25. The OP-amp has an open-loop voltage gain of 100,000. If an OP-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain

A) doubles B) drops to 12.5 C) remains at 25 D) increases slightly

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Answer & Solution

Answer: Option C

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How many OP-amps are required to implement this equation V₀ = V₁

A) 4 B) 3 C) 2 D) 1

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Answer & Solution

Answer: Option D

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The input impedance of a differential amplifier equals r'e times

A) ß B) RE C) RC D) 2ß

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Answer & Solution

Answer: Option D

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The ideal OP-AMP has the following characteristics

A) R_i = $$\infty $$, A_V = $$\infty $$, R_O = 0 B) R_i = 0, A_V = $$\infty $$, R_O = 0 C) R_i = $$\infty $$, A_V = $$\infty $$, R_O = $$\infty $$ D) R_i = 0, A_V = $$\infty $$, R_O = $$\infty $$

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Answer & Solution

Answer: Option A

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A 741-Type OP-amp has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of

A) 50 kHz B) 100 kHz C) $$\frac{{1000}}{{17}}{\text{ kHz}}$$ D) $$\frac{{1000}}{{7.07}}{\text{ kHz}}$$

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Answer & Solution

Answer: Option A

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In the above circuit the current i_x is

A) 0.6A B) 0.5A C) 0.2A D) $$\frac{1}{{12}}{\text{A}}$$

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Answer & Solution

Answer: Option B

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