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Which of the following device converts DC to AC?

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The amplifier having the highest amount of distortion is (a) Class A (b) Class B (c) Class C (d) Class AB 

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If the emitter resistance ‘Re ’ in a transistor amplifier is removed, then (a) base to emitter junction will be less forward biased. (b) gain of amplifier decreases. (c) Q-point becomes unstable. (d) All of these 

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Consider a single stage tuned amplifier having 3dB bandwidth of lOOKHz. Determine the bandwidth if two such single stage tuned amplifiers are cascaded :  A) lOOKHz B) lOKHz C) 41.4KHz D) 64.3KHZ

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An amplifier without feedback has a voltage gain of 50, input resistance 1kΩ and output resistance of 2.5kΩ. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 would be: (1) 1/11 kΩ (2) 1/5 kΩ (3) 5 kΩ (4) 11 kΩ

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An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is  A) 25 micro-volt B) 50 micro-volt C) 5 Volts D) 10 volts

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How does negative feedback reduces distortion in an amplifier?

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Push-pull amplifier circuit is used as (a) RF amplifier (b) audio amplifier (c) power amplifier (d) current amplifier

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Class A amplifier is used when  (A) No phase inversion is required (B) Highest voltage gain is required (C) dc voltages are to be amplified (D) Minimum distortion is desired. 

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Negative feedback in an amplifier is accompanied by (A) Gain less sensitive to component variations (B) Increase in gain (C) Decrease in bandwidth (D) None of the above

asked May 12, 2018 in Amplifier by Shimroz123
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The ideal operational amplifier does not have: (1) Infinite input resistance (2) Infinite output resistance (3) Infinite voltage gain (4) Infinite bandwidth 

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In a radio receiver the IF amplifier  (A) is tuned above the stations incoming frequency (B) amplifies the output of local oscillator (C) is fixed tuned to one particular frequency (D) can be tuned to various isolate frequencies

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Negative feedback amplifier has a signal corrupted by noise as its input. The amplifier will   (A) Amplify the noise as much as the signal (B) Reduce the noise (C) Increase the noise (D) Not effect the noise

asked May 17, 2018 in Amplifier by Shimroz123
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In class-A amplifier conduction extends over 360° because the operating point.  1. Located near saturation point 2. Located at or near cut-off point 3. Located on load line 4. Located in the centre of load line 

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A high-Q tuned circuit in an amplifier permits to have high (a) selectivity (b) fidelity (c) sensitivity (d) frequency ranges

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Just as a voltage amplifier signal voltage a power amplifier.  1.amplifier power  2.amplifier signal  3.converts the signal ac power into DC power  4.converts a dc power into useful AC power 

asked May 13, 2018 in Amplifier by Shimroz123

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