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  1. Problems
  2. /Electronics

Electronics

Physics

Diodes, transistors, and basic circuits.

+ Upload a Problem
33 problems
Exam:
Type:
1.
Light detectors for different jobs are made from different crystals… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Easy
2.
A beam of infrared light of wavelength 850 nm carries a power of 1.0 mW onto a silicon photodiode… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Medium
3.
A thin rod of pure germanium is used to sense temperature… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Hard
4.
Compare silicon (Eg = 1.12 eV) and germanium (Eg = 0.67 eV) at 300 K… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Medium
5.
Silicon has 5.0 × 10²⁸ atoms in each cubic metre… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Easy
6.
Silicon has 5.0 × 10²⁸ atoms in each cubic metre… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Medium
7.
A silicon wafer is doped with both kinds of impurity… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Hard
8.
A resistor is cut from n-type silicon in which ne = 1.0 × 10²¹ m⁻³… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Hard
9.
A silicon p-n junction has a barrier potential of 0.60 V across a depletion layer that is 0.50 µm… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Medium
10.
A silicon diode follows the equation I = Is(e^(V/VT) - 1) with η = 1, Is = 1.0 pA and VT = 25.85 mV… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Hard
11.
A battery of 6.0 V is joined to a resistor of 470 Ω and a diode in series… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Easy
12.
A half-wave rectifier has an ideal diode and a load of 470 Ω… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Easy
13.
A bridge rectifier with four silicon diodes gets its input from a transformer that gives 18 V rms… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Medium
14.
A bench supply is built with a full-wave bridge on a 50 Hz mains transformer… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Hard
15.
A half-wave rectifier has a load RL = 900 Ω… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Medium
16.
A 9.1 V Zener diode is used in a regulator… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Easy
17.
A sensor circuit needs a steady 5.1 V from a supply whose voltage is not steady… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Hard
18.
A regulator has an input of 15 V, a series resistor of 120 Ω and a 6.2 V Zener diode… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Medium
19.
A real Zener diode has a dynamic resistance rz = 4.0 Ω in breakdown… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Medium
20.
A red LED is made from a semiconductor of band gap 1.9 eV, and a blue LED from a semiconductor of… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Easy
21.
A green LED has a semiconductor with a band gap of 2.3 eV, and each photon that it gives out has… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Hard
22.
A silicon photodiode is used in reverse bias to measure infrared light of wavelength 900 nm… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Medium
23.
A farmer plans a solar panel for a small water pump… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Hard
24.
In a transistor circuit, a milliammeter in the collector lead reads 3.60 mA and a microammeter in… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Easy
25.
A silicon transistor with β = 120 is connected to a supply of 12 V… New
High School (11–12) · ElectronicsStemPy LabStemPy Lab
Medium
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