Analog Electronics - Study Mode

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[#236] An amplifier has two identical cascaded stages. Each stage has a bandwidth of 20 kHz. The overall bandwidth shall approximately be equal to

(A) 10 kHz

(B) 12.9 kHz

(C) 20 kHz

(D) 28.3 kHz

Correct Answer

(B) 12.9 kHz

[#237] If an op-amp comparator has a gain of 100, 000, an input difference of 0.2 mV above reference, and a supply of ±12 V. The output will be:

(A) 15 V

(B) 12 V

(C) 20 V

(D) 10 V

Correct Answer

(B) 12 V

[#238] An amplifier has a signal input voltage V i of 0.25 V and draws 1 mA from the source. If the amplifier delivers 8 V to a load of 10 mA, the power gain is

(A) 340

(B) 320

(C) 250

(D) 150

Correct Answer

(B) 320

[#239] For a MOSFET satisfying the relationship V DS < V GS - V TH , where the drain voltage is V DS , the gate voltage is V GS , and the threshold voltage of the transistor is V TH , then the transistor is said to operate in:

(A) Pinch off

(B) Saturation

(C) Cut off

(D) Triode region

Correct Answer

(D) Triode region

[#240] To get a peak load voltage of 40 V out of a bridge rectifier. What is the approximate rms value of secondary voltage?

(A) 0 V

(B) 14.4 V

(C) 28.3 V

(D) 56.6 V

Correct Answer

(C) 28.3 V