Analog Electronics - Study Mode

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[#106] If the op-amp in the figure has an input offset voltage of 5 mV and an open-loop voltage gain of 10,000, then V 0 will be

(A) 0 V

(B) 5 mV

(C) +15 V or -15 V

(D) +50 V or -50 V

Correct Answer

(C) +15 V or -15 V

[#107] The feedback topology in the amplifier circuit (the base bias circuit is not shown for simplicity) in the figure is

(A) Voltage shunt feedback

(B) Current series feedback

(C) Current shunt feedback

(D) Voltage series feedback

Correct Answer

(B) Current series feedback

[#108] What is the load current I L in the circuit below?

(A) -5 mA

(B) -10 mA

(C) +25 mA

(D) +50 mA

Correct Answer

(B) -10 mA

[#109] Consider the circuit shown below. Find the output voltage V 0 for input voltage V i = 5 V. Assume the voltage drop across a conducting diode is 0.7 V.

(A) 8.65 V

(B) 6.5 V

(C) 7.85 V

(D) 5 V

Correct Answer

(C) 7.85 V

[#110] The circuit in the figure employs positive feedback and is intended to generate sinusoidal oscillation. If at a frequency $${{ ext{f}}_0},{ ext{B}}left( { ext{f}}
ight) = frac{{{{ ext{V}}_{ ext{f}}}left( { ext{f}}
ight)}}{{{{ ext{V}}_0}left( { ext{f}}
ight)}} = frac{1}{6}angle {0^ circ }$$ xa0 xa0 then to sustain oscillation at this frequency

(A) $${{ ext{R}}_2} = 5{{ ext{R}}_1}$$

(B) $${{ ext{R}}_2} = 6{{ ext{R}}_1}$$

(C) $${{ ext{R}}_2} = frac{{{{ ext{R}}_1}}}{6}$$

(D) $${{ ext{R}}_2} = frac{{{{ ext{R}}_1}}}{5}$$

Correct Answer

(A) $${{ ext{R}}_2} = 5{{ ext{R}}_1}$$