30 Questions
What is the smallest particle of an element that still retains the characteristics of that element?
An atom
What is the charge of an electron?
Negative
What is the number of protons and electrons in a helium atom?
Two protons and two electrons
What is the main difference between a proton and a neutron?
Protons are positively charged, neutrons are uncharged
What is the mass of a proton relative to an electron?
1836 times greater
What is the structure of an atom according to the Bohr theory?
A central nucleus surrounded by orbiting electrons
What happens to the resistivity of silicon and germanium as the temperature increases?
It decreases
Why should silicon not operate at a working temperature above 150°C to 200°C?
It may lose its semiconducting properties
What happens to the resistivity of a semiconductor as the temperature decreases?
It increases
What is the number of valence electrons in silicon and germanium?
4
What is the effect of incidence of light on the conductivity of semiconductors?
It increases
What is the classification of semiconductors with impurities?
Extrinsic
What proportion of the holes passing into the base from the emitter can pass through the base-collector junction?
0.995
What is the direction of the leakage current in an n-p-n transistor?
From the collector to the base
What is the relation between the emitter current and the sum of the collector and base current?
IE = IC + IB
What is the typical value of IC in terms of IE?
0.99 IE
What is the purpose of the base-collector junction in a p-n-p transistor?
To forward bias the minority carriers
What is the name of the current that flows from the collector to the base due to thermally generated minority carriers?
ICBO
What is the ratio of IE, IC, and IB currents in a transistor configuration?
1: α : (1 - α)
In a common-emitter configuration, what is the typical output resistance?
Kilo ohms
What happens to the collector current in a common-emitter configuration?
It reduces to zero without reversing the collector voltage
What is the shape of the characteristic obtained when VEB is varied?
Similar to the input characteristic for a common-base configuration
What is the difference between the output characteristics of n-p-n and p-n-p transistors?
They have reversed polarities
What is the direction of the slope of the output characteristics in a common-emitter configuration?
Sloping upwards
What type of transistor is being discussed alongside BJT?
JFET
What is the purpose of feedback in electronic circuits?
To modify the signal
What is the difference between open and closed loop control systems?
Type of feedback
What is the role of the signal combination in a feedback system?
To modify the signal
What is the effect of negative feedback on an amplifier?
It decreases the gain
What is the name of the theorem discussed in the chapter?
Feedback Theorem
Learn about the basics of atomic structure, elements and their composition. Understand how atoms are formed and what makes each element unique. Find out about the Bohr theory and its significance in chemistry.
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