The PIV rating of a crystal diode is _______________ relative to an equivalent vacuum diode
Show answer Hide answer
Answer: B. lower than
Explanation
Crystal diodes feature microscopic semiconductor junctions with limited physical spacing between the electrodes. This compact solid-state structure cannot withstand the massive voltage gradients possible in physical vacuum gaps. Consequently, the peak inverse voltage rating of a crystal diode is lower than an equivalent vacuum diode. Vacuum tube diodes utilize physical space and high-vacuum insulation to prevent internal arc-over during reverse bias. Solid-state crystal diodes rely on semiconductor physics where high reverse voltages can cause catastrophic punch-through. Historical electronic designs frequently required bulky vacuum tubes specifically for handling extreme high-voltage rectification.
Early television and radio engineering required careful consideration of diode PIV ratings when replacing vacuum tubes. Modern semiconductor technology has largely overcome these limitations through specialized high-voltage silicon designs. Comparing solid-state and vacuum devices highlights the historical evolution of power electronics component engineering. The same rating is incorrect because vacuum tubes possess vastly superior physical insulation against reverse arcs. More than is incorrect since semiconductor junctions break down at lower reverse voltage thresholds than vacuum gaps. None of the above is incorrect because crystal diodes indeed exhibit lower PIV ratings than vacuum tubes.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. As the doping level inside a crystal diode goes up, the depletion layer width_____________?
Show answer Hide answer
Answer: C. in increased
Higher impurity doping concentrations introduce more charge carriers that compress the internal depletion region width. This physical compression is a fundamental consequence of electrostatic field interactions within th...
Q2. The proportion of reverse resistance to forward resistance in a germanium crystal diode is roughly ______________?
Show answer Hide answer
Answer: D. 40,000 : 1
Germanium crystal diodes exhibit a very high ratio of reverse resistance to forward resistance, approximately 40,000 to 1. This massive resistance ratio ensures that the diode acts as an efficient switch passing forward...
Q3. When the arrowhead of a crystal diode symbol is positive with respect to the bar, the diode is _____________biased?
Show answer Hide answer
Answer: A. forward
The arrowhead symbol of a crystal diode represents the anode terminal connected to the p-type semiconductor. Applying a positive potential to this arrowhead relative to the cathode bar forward biases the junction. This f...
Q4. The upper efficiency limit for a half-wave rectifier is _____________?
Show answer Hide answer
Answer: A. 40.6 %
Mathematical derivation of half-wave rectification proves that maximum conversion efficiency is limited to forty percent. Power losses occur because the circuit blocks the entire negative half-cycle of the alternating in...
Q5. When the graph between current through and voltage across a device is a straight line, the device is referred to as _______________?
Show answer Hide answer
Answer: A. linear
A linear device exhibits a straight line proportional relationship between current flowing through and voltage across its terminals. Plotting this relationship on a graph yields a constant slope, meaning resistance or im...
Q6. Elevating the temperature of a crystal diode causes the leakage current to ______________?
Show answer Hide answer
Answer: C. increases
Elevating the temperature of a crystal diode provides thermal energy that breaks covalent bonds in the silicon. This thermal generation creates additional minority charge carriers that drift across the reverse-biased jun...