Electrical Engineering is part of Engineering and holds 3,646 questions with answers, free to read and with no account needed.
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Answer: B. common collector
The common collector configuration provides very high input impedance due to strong series negative feedback. Emitter follower circuits reflect the load resistance multiplied by current gain back to the input. This high...
Answer: A. collector
The collector region of a standard bipolar transistor is manufactured with the largest physical dimensions. A larger physical size allows the collector to absorb dispersed heat generated during high-power electrical oper...
Answer: B. reverse bias at all times
Normal transistor operation requires the collector-base junction to maintain a continuous reverse bias condition. Reverse biasing creates a wide depletion region that sweeps minority carriers across toward the collector....
Answer: B. heavily
The emitter region is engineered with a high concentration of impurity atoms during the semiconductor manufacturing process. This heavy doping creates an abundant supply of majority charge carriers ready to be injected a...
Answer: B. holes
Minority charge carriers in an npn transistor are positively charged holes within the base region. Free electrons serve as the majority charge carriers in both the emitter and collector regions. Semiconductor doping prin...
Answer: B. silicon
Silicon is the predominant semiconductor material utilized in the commercial fabrication of modern transistors. Its superior abundance, crystal structure, and thermal performance make it ideal for semiconductor manufactu...
Answer: C. lightly
The base region of a bipolar transistor is deliberately manufactured to have a very light doping level. Light doping minimizes the concentration of majority carriers available for electron-hole recombination processes. T...
Answer: D. 5%
The base region of a bipolar transistor is manufactured to be extremely thin and lightly doped with impurities. Because of this physical design, only a tiny fraction of the injected charge carriers recombines within the...
Answer: C. ICBO
The collector current equation incorporates alpha multiplied by emitter current alongside leakage current. ICBO represents the reverse saturation current flowing from collector to base with emitter open. This fundamental...
Answer: B. low resistance to high resistance
Transistor amplifier stages are biased to transfer electrical signals from a low resistance input to a high resistance output. This impedance transformation allows the device to develop a large voltage swing across the o...
Answer: B. moderately
The collector region of a bipolar transistor is engineered with a moderate semiconductor doping concentration. This moderate doping level helps manage power dissipation and breakdown voltage limits effectively. It provid...
Answer: D. 200
Beta is mathematically defined as the ratio of collector current to base current in a bipolar transistor. Base current is calculated by subtracting collector current from emitter current, yielding a very small value. Div...
Answer: A. XL decreases and XC increases
Dropping the signal frequency below resonance decreases the inductive reactance in the parallel network. Lowering the frequency simultaneously raises the capacitive reactance according to standard reactance equations. Th...
Answer: D. holes
A pnp transistor consists of an n-type base sandwiched between two p-type semiconductor regions. In p-type regions, the primary charge carriers responsible for electrical conduction are missing valence electrons called h...
Answer: D. 200
Radio frequencies designate alternating current frequencies that lie strictly above standard audio frequency limits. Industry classifications establish two hundred kilohertz as the conventional lower threshold for radio...
