Test: Types of Power Diodes
20 Questions MCQ Test Power Electronics | Test: Types of Power Diodes
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Shown below is the diagram of an ideal super diode. When the input voltage Vin is negative, then the output voltage Vout = ?
When the input voltage is negative, there would be a negative voltage on the diode so it works like an open circuit. Hence no current flows through the load and Vout is zero.
In order to reduce the reverse recovery time of the diodes, __________ is carried out.
Platinum & gold doping improves the performance of the devices.
Which of the following diodes uses a metal-semiconductor junction?
Schottky diode uses a Al-Semiconductor junction.
Which of the below mentioned statements is false regarding Schottky diodes?
The majority charge carriers in a Schottky diode are electrons not holes.
Due to the metal-silicon junction there are no stored charges hence, no reverse recovery time, due to which the switching is faster.
Which of the following are/is the majority charge carriers in a Schottky diode?
The metal has no holes hence major(almost full) current flows due to the electrons only.
Usually only n-type silicon is used because the p-type has certain limitations.
As compared to a p-n junction diode(of the same rating), a Schottky diode has ___________
Due to the metal-silicon junction there are no stored charges, hence no reverse recovery time due to which the switching is faster.
Schottky diode uses a Al-Semiconductor junction.
A Schottky diode can be switchd off much faster than an equivalent p-n junction diode due to its
Due to the metal-silicon junction there are no stored charges, hence no reverse recovery time due to which the switching is faster.
Ideally the voltage drop across a conducting diode must be
Ideal conduction = No losses.
Recall the I-V curve of a diode in the 3rd quadrant.
Due to the metal used to carry the current, it is also called as a hot carrier diode.
In a Schottky diode, the aluminum metal acts as a __________
The Al (Metal) always acts as the anode.
If the doping levels of the semiconductor is increased, then the width of the depletion layer
Higher the doping, more the number of charge carrier available to neutralize the opposite charges on the junction.
As compared to a p-n junction device of equal rating, the Schottky diode has
Low reverse voltage rating is the only drawback against a p-n junction diode.
In a Schottky diode, the silicon layer acts as a _____________
The metal acts as the anode and the semiconductor as a cathode.
In a certain power electronics application, it is required that the voltage at the load terminals is to be kept within a certain range of voltages only. Among the device listed below, which would be the most ideal choice for this application?
Zener diode is used as a voltage regulating device.
Shown below is the diagram of an ideal super diode. When the input voltage Vin is positive, then the output voltage Vout = ?
Input is positive, hence it is amplified by the operational amplifier which switches the diode on. Current flows through the load & because of the feedback, the output voltage is equal to the input voltage.
Zener diodes allow a current to flow in the reverse direction, when the
Zener diode has voltage regulating property. When voltage reaches above a certain value (Zener voltage), current starts to flow in the reverse direction.
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