Electronics and Communication Engineering - Analog Electronics

46. 

In an op-amp comparator, the positive or negative output is

A. saturated
B. amplifier
C. unsaturated
D. any of the above

Answer: Option A

Explanation:

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47. 

In logarithmic amplifiers, output voltage is equal to

A. K.log10 (input voltage)
B. K.loge (input voltage)
C. input voltage
D.

Answer: Option B

Explanation:

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48. 

In a series regulated power supply circuit the voltage gain of pass transistor satisfies the condition

A. Av → ∞
B. 1 << Av → ∞
C. Av ≈ 1
D. Av << 1

Answer: Option C

Explanation:

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49. 

Occasionally a discrete amplifier user RF chokes instead of collector resistors. Such amplifiers are inherently

A. low pass amplifiers
B. high pass amplifiers
C. band pass amplifiers
D. none of the above

Answer: Option B

Explanation:

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50. 

In oscillator circuits the energy feedback to its input terminal from output is

A. always in phase with the input signal
B. 90° out of phase with the input signal
C. 180° out of phase with the input signal
D. 270° out of phase with the input signal

Answer: Option C

Explanation:

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