Question 51 : Input stage of power amplifier is also called ___________
1. First op
2. Beginning stage
3. Front end
4. Normal stage
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Question 52 : Power amplifier directly amplifies ___________
1. Voltage of signal
2. Current of the signal
3. Power of the signal
4. All of the mentioned
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Question 53 : Which device was used for the amplification of audio signals before the invention of power amplifiers?
1. Diode
2. Op-amp
3. Vacuum tubes
4. SCR
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Question 54 : Unit of power rating of a transistor is expressed in ___________
1. Watts
2. KWh
3. W/s
4. Wh
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Question 55 : The unwanted characteristics of amplifier output apart from the desired output is collectively termed as ___________
1. Inefficiency
2. Damage
3. Fault
4. Distortion
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Question 56 : The use of amplifier in a circuit is to _____________ for input signal.
1. Provide a phase shift
2. Provide strength
3. Provide frequency enhancement
4. Make circuit compatible
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