Amplifiers Objectives Part 01
01 . An Amplifier should have all of them (high Fidelity, low noise, stable operation).
02 . If the operation of an NPN transistor amplifier is selected in saturation region, it is likely to result in chopping of output in positive half of input signal.
03 . The input signal is to amplifiers having a gain of 400 is given as 0.5 cos (313t). Then output signal is 20 cos (403t).
04 . The power gain of an amplifier is 40 and its voltage gain is 200. Then current gain will be 1/5.
05 . The signal handling capacity of an amplifier will be high when the operating point is selected in middle of the active region.
06 . An amplifier circuit has voltage gain of 400. If the output is 4 V. the input voltage should be 10mV.
07 . The 3 bipolar transistor configurations provide best power gain in Common Emitter.
08 . A transistor with 85% efficiency is likely to be Class C.
09 . Class B amplifier is corresponds to half-wave rectifier (for voltage waveform).
10 . The double tuned transformer used for 455 kHz IF Amplifier.
11 . A class A amplifier is the one in which IE flows all the time.
12 . n case of amplifiers transformer coupling gives highest gain.
13 . In a resistance loaded, RC coupled amplifier the dc component blocked by coupling Capacitor Cc.
14 . In a RC Coupled amplifier, low frequency response is improved with higher CC.
15 . Class A of amplifier has lowest efficiency.
16 . Emitter bias depend upon emitter current IE.
17 . For a FET, Is = 5 mA, and Rs = 330. Then source bias will be 1.65 V.
18 . A transistor that can be used in enhancement mode is MOSFET.
19 . In general the gain of an amplifier is complex.
20 . An FET has a gate source bias of 2 V. the ac input signal is + 1.2 V. the class of operation is A.