20+ Top Tunnel Devices MCQs with Answers
What is a tunnel diode primarily used for?
Hint: Tunnel diodes are commonly used for oscillator circuits.
In a tunnel diode, the tunneling effect leads to:
a) Exponential increase in current
b) Exponential decrease in current
c) Linear increase in current
Hint: The tunneling effect causes an exponential increase in current.
Tunnel diodes are based on the principle of:
a) Avalanche breakdown
b) Zener breakdown
c) Quantum tunneling
Hint: Tunnel diodes operate based on quantum tunneling.
The region in the tunnel diode where the current decreases with voltage is called:
a) Forward bias
b) Reverse bias
c) Breakdown region
Hint: In reverse bias, the current decreases with voltage due to tunneling.
Tunnel diodes have a negative differential resistance region, which means:
a) Voltage increases with current
b) Current increases with voltage
c) Current decreases with voltage
Hint: In the negative differential resistance region, current decreases with voltage.
What is the doping concentration in a tunnel diode?
a) Heavily doped
b) Lightly doped
c) Moderately doped
Hint: Tunnel diodes are heavily doped to increase tunneling probability.
In a tunnel diode, as the voltage increases in the negative resistance region, the current:
c) Remains constant
Hint: In the negative resistance region, current decreases with increasing voltage.
Tunnel diodes are often used in:
a) Low-frequency applications
b) High-frequency applications
c) DC applications
Hint: Tunnel diodes find applications in high-frequency circuits.
The first practical tunnel diode was invented by:
a) John Bardeen
b) William Shockley
c) Leo Esaki
Hint: Leo Esaki invented the tunnel diode in 1957.
The tunnel diode operates in the ___________ region of the I-V curve.
c) Negative resistance
Hint: Tunnel diodes operate in the negative resistance region.
The tunnel diode was initially known as the ___________ diode.
Hint: The tunnel diode was named after its inventor, Leo Esaki.
The negative resistance region in a tunnel diode occurs due to ___________.
a) Carrier multiplication
b) Carrier injection
c) Quantum tunneling
Hint: The negative resistance results from the quantum tunneling of carriers.
What is the unique feature of the tunnel diode’s I-V curve?
a) It is linear
b) It is exponential
c) It has a negative resistance region
Hint: The tunnel diode’s I-V curve exhibits a negative resistance region.
Tunnel diodes have a ___________ bandgap compared to regular diodes.
Hint: Tunnel diodes have a smaller bandgap, which enables tunneling.
The negative resistance in a tunnel diode is utilized in ___________ circuits.
Hint: Tunnel diodes are often used in oscillator circuits.
Tunnel diodes are typically made of ___________ material.
c) Gallium arsenide
Hint: Tunnel diodes are commonly made of gallium arsenide.
The tunneling effect in a tunnel diode occurs due to the ___________ nature of electrons.
Hint: Electrons exhibit wave-like behavior, enabling tunneling.
The tunnel diode is also known as a ___________ diode.
Hint: The tunnel diode is named after Leo Esaki.
Tunnel diodes are mainly used in ___________ circuits.
Hint: Tunnel diodes are extensively used in microwave circuits.
The I-V characteristic curve of a tunnel diode shows a ___________ shape.
Hint: The I-V curve of a tunnel diode is S-shaped due to negative resistance.
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