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: A. one-fourth
Feeding a uniformly loaded distribution cable from both ends with equal voltages creates symmetrical voltage drops. Mathematical derivation shows that the maximum voltage drop occurs at the midpoint of the distribution l...
Answer: C. low resistance
The base-emitter junction of a properly operating transistor is biased in the forward direction. Forward-biased pn junctions naturally exhibit a very low electrical resistance to current flow. This low resistance allows...
Answer: A. common emitter
The common emitter configuration provides substantial current gain and high voltage gain simultaneously. This balanced combination of high power gain makes it the most versatile and widely utilized transistor arrangement...
Answer: C. ß = a / (1 – a )
Mathematical derivation from fundamental definitions yields the exact formula beta equals alpha divided by one minus alpha. Current gains alpha and beta represent ratios of collector current to emitter and base currents...
Answer: A. high
Standard bipolar transistors have their output taken from the collector circuit, which contains a reverse-biased PN junction. A reverse-biased semiconductor junction naturally presents a very high opposition to current f...
Answer: C. hole current in the emitter
Standard semiconductor schematic symbols feature an arrow on the emitter lead pointing outward or inward. This arrow direction represents the flow of conventional hole current across the emitter-base junction. Convention...
Answer: B. 180o
In a common emitter amplifier, an increasing input voltage increases base current and lowers collector voltage. This inverse relationship between input voltage swing and output collector voltage creates an inverted outpu...
Answer: C. ICEO
Collector current expression in a common emitter configuration includes the amplified base current term. ICEO represents the collector-to-emitter leakage current flowing when the base terminal remains open. Combining bet...
Answer: A. more than
Leakage current in a common emitter configuration is designated as ICEO and includes multiplied collector-base leakage. The common base leakage current (ICBO) is amplified by the transistor's beta factor in the common em...
Answer: B. 00
The common collector configuration, often called an emitter follower, provides a zero degree phase shift. The output voltage strictly tracks the changes in the input voltage without any inversion. This characteristic mak...
Answer: B. low
During normal active operation, the base-emitter junction of a bipolar transistor is heavily forward-biased. Forward biasing significantly lowers the barrier potential of the PN junction, facilitating easy entry of charg...
Answer: D. 0o
Input and output voltages in a common base setup remain perfectly in phase with each other. The lack of phase inversion results in a net phase shift of zero degrees between signals. Collector current follows emitter curr...
Answer: C. common base
The common base transistor configuration features its output connected directly across a reverse-biased collector junction. This reverse-biased junction inherently exhibits extremely high electrical resistance, yielding...
Answer: D. IE = IC + IB
Kirchhoffs current law states that total current entering a junction must equal the total current leaving. In a transistor, the emitter current splits into base current and collector current components. Adding the base c...
Answer: C. pass through the base region to the collector
The base region is manufactured to be extremely thin, allowing most injected carriers to traverse it quickly. A strong electric field across the reverse-biased collector junction sweeps these surviving charge carriers on...
