Consider a common emitter amplifier. If the collector current at saturation is 10 mA and the cutoff voltage is 9V, what should be the coordinates of the operating point for: a) Class A amplifier b) Class B amplifier
Power Amplifier
The power amplifier is an electronic amplifier designed to maximize the signal strength of a given input. The input signal strength is enhanced to a high enough level to drive output devices such as speakers, headphones, RF (Radio frequency) transmitters, etc. Unlike voltage / current amplifiers, the power amplifier is designed to drive core loads directly and is used as a storage block in the amplifier series.
Maximum Efficiency Criterion
In every field of engineering, there is a tremendous use of the machine and all those machines are equipped for their popular work efficiency so it very much important for operation engineers to monitor the efficiency of the machine, planning engineers to check out the efficiency of the machine before installing the machine and design engineers to design machine for higher efficiency than and then the utility will procure their products that will ultimately lead to profit and loss of the company. It indicates the importance of efficiency right from the initial stage as manufacturing units, intermediate stage as planning coordinators, and end-users stage as a utility.
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1. Consider a common emitter amplifier. If the collector current at saturation is 10
mA and the cutoff voltage is 9V, what should be the coordinates of the
operating point for: a) Class A amplifier b) Class B amplifier
2. Given the following: Average load voltage of 24 V, maximum average load
current is 1.2 A. Filter output ranges from 34.8 V to 37.2 V. Which Zener diode can
be used in the regulator stage?
a) 24 V, 3 A b) 24 V, 1.2 A c) 24 V, 2.0 A d) 24 V, 5 A
3. The maximum allowable ripple factor is 0.28. If the peak load voltage is 18 V for a
load resistance of 800 Ω. which of the following capacitors can be used in a half-
wave rectifier with filter?
a) 15 μF, 20 V b) 47 μF, 60 V c) 18 μF, 25 V d) 22 μF, 50 V
4. In which region is the transistor being operated for each of the following sets of
DC transistor terminal voltages (with respect to ground)?
a) Collector: -7.32 V Base: -2.75 V Emitter: -2.07 V
b) Collector: 10.55 V Base: 9.89 V Emitter: 9.65 V
5. Assume that each of the given gate-source voltage is greater than the cutoff
voltage. Identify which n-channel transistor (JFET, D-MOSFET or E-MOSFET) is being
biased into normal operation: a) +3 V b) -5 V
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