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A semiconductor diode is built of a semiconductor material, most often silicon. It’s similar to a door that allows energy to pass through, but it only opens in one direction.
A diode is a semiconductor device that permits electrical currents to flow only in the desired direction . A semiconductor is a substance that allows electricity to pass through it, but not as efficiently as a stronger conductor like copper.
The majority of today’s diodes are semiconductor diodes. When referring to a semiconductor diode, the term “diode” is often used.
1. Why does the current in a Zener diode suddenly increase?
a) Due to damage in ionic bonds
b) Due to damage in covalent bonds
c) Because of viscosity
d)Because of potential difference
Answer: b
Explanation: In a Zener diode, the abrupt spike in current is caused by the breaking of the numerous covalent bonds present. As a result, the Zener diode must be wired in reverse bias.
2. What does a semiconductor diode do?
a) Oscillator
b) Amplifier
c) Rectifier
d) Modulator
Answer: c
Explanation: A rectifier is a device that transforms alternating current to direct current by allowing electricity to flow in just one direction.
3. What is the definition of an oscillator?
a) An amplifier with a large gain
b) An amplifier with negative feedback
c) An amplifier with positive feedback
d) An amplifier with no feedback
Answer: c
Explanation: An oscillator may be thought of as a positive feedback amplifier. It transforms a power supply’s direct current to an alternating current signal. It generates an alternating waveform in the absence of any input.
4. What is the definition of rectification?
a) conversion of ac into dc
b) conversion of low ac into high ac
c) conversion of dc into ac
d) conversion of low dc into high dc
Answer: a
Explanation: The process of converting alternate electricity to direct current is known as rectifying. The conversion converts direct current to alternating current, then changes the voltage via a transformer, and lastly rectifies the power back to direct current.
5. What is the purpose of a Zener diode?
a) Oscillator
b) Regulator
c) Rectifier
d) Filter
Answer: b
Explanation: A voltage regulator may be made out of a zener diode. They may also be used to modulate voltage across tiny circuits as shunt regulators. Zener diodes are always reverse-biased when they are used.
6. The p-n junction may be forward biased to provide infinite resistance.
a) True
b) False
Answer: b
Explanation: No, this is a blatant lie. Low resistance is achieved by forward biasing the p-n junction. The resistance given is zero in the case of a perfect p-n connection. As a result, forward biasing provides little resistance.
7. What causes current to flow across a junction diode when it is reverse biased?
a) Diffusion of charges
b) Nature of material
c) Drift of charges
d) Both drift and diffusion of charges
Answer: c
Explanation: The major cause of reverse current is charge drift. The reason for this is because carriers like holes and free electrons move across a square centimetre region perpendicular to the flow direction.
8. Determine the conditions under which a transistor may function as an amplifier.
a) The emitter-base junction is forward biased and the base-collector junction is reverse biased
b) No bias voltage is required
c) Both junctions are forward biased
d) Both junctions are reverse biased
Answer: a
Explanation: The emitter-base junction of a transistor must be forward biased, while the base-collector junction must be reverse biased, in order to utilize it as an amplifier. This is the need for a transistor to work as an amplifier.
9. What can you do with a p-n junction diode?
a) Condenser
b) Regulator
c) Amplifier
d) Rectifier
Answer: d
Explanation: A junction diode may be used as a rectifier, as explained above. A rectifier is a device that transforms alternating electricity into direct current. The diode is forward biased and permits electric current to flow through it during the positive half cycle.
10. What are the components of a transistor?
a) Chip
b) Insulator
c) Semiconductor
d) Metal
Answer: c
Explanation: A semiconductor device is a transistor. Transistors may function as both an amplifier and a switch. It amplifies or switches electronic impulses. A transistor is a silicon and germanium-based solid-state device.
11.What does a crystal diode have?
one pn junction
two pn junctions
three pn junctions
none of the above
Answer: a
12. The forward resistance of a crystal diode is on the order of………….
kΩ
Ω
MΩ
none of the above
Answer: b
13. If the arrow of the crystal diode sign is positive in relation to the bar, the diode is………….. biased.
forward
reverse
either forward or reverse
none of the above
Answer: a
14. A diode’s reverse current is of the order of……………….
kA
mA
μA
A
Answer: c
15. The forward voltage drop across a silicon diode is about…………………
2.5 V
3 V
10 V
0.7 V
Answer: d
17. A crystal diode’s d.c. resistance ………… its a.c. resistance.
the same as
more than
less than
none of the above
Answer: c
