Electronics MCQs Question and Answer in Engineering Physics Page-2 section-1

11.
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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12.
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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13.
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$$\Omega $$ ]

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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14.
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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15.
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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16.
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,

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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17.
In the following circuit Tr₁ and Tr₂ are identical transistors having V_BE = 0.7 V. The current passing through the transister Tr₂ is

A. 57 mA

B. 50 mA

C. 48 mA

D. 43 mA

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18.
Identify the function F generated by the logic network shown.

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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19.

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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20.
The circuit shown below can be used as

A. NOR gate

B. OR gate

C. NAND gate

D. AND gate

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Electronics MCQs Question and Answer in Engineering Physics

11. 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

Answer & Solution

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

Answer & Solution

13. 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$$\Omega $$ ]

Answer & Solution

14. RAM and ROM are

Answer & Solution

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

Answer & Solution

16. 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,

Answer & Solution

17. In the following circuit Tr1 and Tr2 are identical transistors having VBE = 0.7 V. The current passing through the transister Tr2 is

Answer & Solution

18. Identify the function F generated by the logic network shown.

Answer & Solution

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

Answer & Solution

20. The circuit shown below can be used as

Answer & Solution

11.
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

12.
A common emitter transistor amplifier circuit is operated under a fixed bias. In this circuit, the operating point

13.
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$$\Omega $$ ]

14.
RAM and ROM are

15.
A power amplifier gives 150 W output for an input of 1.5 W. The gain in dB is

16.
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,

17.
In the following circuit Tr₁ and Tr₂ are identical transistors having V_BE = 0.7 V. The current passing through the transister Tr₂ is

18.
Identify the function F generated by the logic network shown.

19.

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

20.
The circuit shown below can be used as