Electronics MCQs Question and Answer in Engineering Physics

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The Common Mode Rejection Ratio (CMRR) of a differential amplifier using an operational amplifier is 100 dB. The output voltage for a differential input of 200 μV is 2 V. The common mode gain is

A) 10 dB B) 0.1 dB C) 30 dB D) 20 dB

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Answer & Solution

Answer: Option B

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A common emitter transistor amplifier circuit is operated under a fixed bias. In this circuit, the operating point

A) remains fixed with an increase in temperature B) moves towards cut-off region with an increase in temperature C) moves towards the saturation region with a decrease in temperature D) moves towards the saturation region with an increase in temperature

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Answer & Solution

Answer: Option D

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What should be the values of the components R and R₂ such that the frequency of the Wien bridge oscillator is 300 Hz? [Given, C = 0.01 μF and R₁ = 12 k$$\Omega $$ ]
Electronics mcq question image

A) R = 48 k$$\Omega $$ and R₂ = 12 k$$\Omega $$ B) R = 26 k$$\Omega $$ and R₂ = 24 k$$\Omega $$ C) R = 530 k$$\Omega $$ and R₂ = 1 M$$\Omega $$ D) R = 53 k$$\Omega $$ and R₂ = 24 k$$\Omega $$

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Answer & Solution

Answer: Option D

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RAM and ROM are

A) charge coupled devices used in computers B) computer memories C) logic gates D) binary counters used in computers

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Answer & Solution

Answer: Option B

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A power amplifier gives 150 W output for an input of 1.5 W. The gain in dB is

A) 10 B) 20 C) 40 D) 100

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Answer & Solution

Answer: Option C

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Let $${I_1}$$ and $${I_2}$$ represents mesh currents in the loop abcda and befcb respectively. The correct expression describing Kirchhoff's voltage loop law in one of the following loops is,
Electronics mcq question image

A) $$30{I_1} - 15{I_2} = 10$$ B) $$ - 15{I_1} + 20{I_2} = - 20$$ C) $$30{I_1} - 15{I_2} = - 10$$ D) $$ - 15{I_1} + 20{I_2} = 20$$

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Answer & Solution

Answer: Option A

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In the following circuit Tr₁ and Tr₂ are identical transistors having V_BE = 0.7 V. The current passing through the transister Tr₂ is
Electronics mcq question image

A) 57 mA B) 50 mA C) 48 mA D) 43 mA

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Answer & Solution

Answer: Option D

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Identify the function F generated by the logic network shown.
Electronics mcq question image

A) F = (X + Y)Z B) F = Z + Y + $$\overline {\text{Y}} $$X C) F = ZY(Y + X) D) F = XYZ

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Answer & Solution

Answer: Option D

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Assuming an ideal voltage source, Thevenin's resistance and Thevenin's voltage respectively for the above circuit are

A) 15 $$\Omega $$ and 7.5 V B) 20 $$\Omega $$ and 5 V C) 10 $$\Omega $$ and 10 V D) 30 $$\Omega $$ and 15 V

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Answer & Solution

Answer: Option A

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The circuit shown below can be used as
Electronics mcq question image

A) NOR gate B) OR gate C) NAND gate D) AND gate

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Answer & Solution

Answer: Option D

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