Analog Electronics - Study Mode

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[#251] Consider the following statements: A clamper circuit 1. adds or subtracts a dc voltage to or from a waveform. 2. does not change the shape of the waveform. 3. amplifies the waveform. Which of the statements give above are correct? Of these statements

(A) 1 & 2 are correct

(B) 1 & 3 are correct

(C) 2 & 3 are correct

(D) 1, 2 & 3 are correct

Correct Answer

(A) 1 & 2 are correct

[#252] Class-B amplifier has less efficiency compared to

(A) Class-A

(B) Class-AB

(C) Class-C

(D) Class-A, Class-AB and Class-C

Correct Answer

(C) Class-C

[#253] In a MOSFET operating in the saturation region, the channel length modulation effect causes

(A) An increase in the gate-source capacitance

(B) A decrease in the transconductance

(C) A decrease in the unity-gain cut-off frequency

(D) A decrease in the output resistance

Correct Answer

(D) A decrease in the output resistance

[#254] A two stage capacitor coupled CE amplifier has stages having a voltage gain of 100 each. It is known that the gain of each stage drops by 3 dB at lower cutoff frequency. What is the overall gain of the multistage amplifier at lower cutoff frequency?

(A) 74 dB

(B) 34 dB

(C) -74 dB

(D) -34 dB

Correct Answer

(A) 74 dB

[#255] Input resistance of inverting amplifier as shown in figure with ideal op-amp is:

(A) ∞

(B) zero

(C) 1 kΩ

(D) 10 kΩ

Correct Answer

(C) 1 kΩ