Electronics MCQs Question and Answer in Engineering Physics

61

The circuit, shown is based on ideal operational amplifiers. It acts as a
Electronics mcq question image

A) subtractor B) buffer amplifier C) adder D) divider

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Answer & Solution

Answer: Option B

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62

For any set of inputs, A and B, the following circuits give the same output Q, except one. Which one is it?

A)

B)

C)

D)

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Answer & Solution

Answer: Option D

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63

Pick the correct statement based on the above circuit.

A) The maximum Zener current I_Z(max), when R_L = 10 k$$\Omega $$, is 15 mA B) The maximum Zener current I_Z(max), when R_L = 10 k$$\Omega $$, is 5 mA C) With V_in = 20 V, I_L = I_Z, when R_L = 2 k$$\Omega $$ D) The power dissipated across the Zener, when R_L = 10 k$$\Omega $$ and V_in = 20 V is 100 mW

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Answer: Option B

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64

The high input impedance of Field Effect Transistor (FET) amplifier is due to

A) the pinch-off voltage B) its very low gate current C) the source and drain being far apart D) the geometry of the FET

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Answer: Option B

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65

An analog voltage V is converted into 2-bit binary number. The minimum number of comparators required and their reference voltages are

A) $$3,\,\left( {\frac{V}{4},\,\frac{V}{2},\,\frac{{3V}}{4}} \right)$$ B) $$3,\,\left( {\frac{V}{3},\,\frac{{2V}}{3},\,V} \right)$$ C) $$4,\,\left( {\frac{V}{5},\,\frac{{2V}}{5},\,\frac{{3V}}{5},\,\frac{{4V}}{5}} \right)$$ D) $$4,\,\left( {\frac{V}{4},\,\frac{V}{2},\,\frac{{3V}}{5},\,V} \right)$$

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Answer & Solution

Answer: Option A

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66

In the circuit shown in the figure, the Thevenin voltage V_Th and Thevenin resistance R_Th as seen by the load resistance R_L (= 1 k$$\Omega $$) are respectively
Electronics mcq question image

A) 15 V, 1 k$$\Omega $$ B) 30 V, 4 k$$\Omega $$ C) 20 V, 2 k$$\Omega $$ D) 10 V, 5 k$$\Omega $$

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Answer: Option A

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