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Computer Science - Electronic Principles

Exercise : Electronic Principles - Section 2
21.
Which one of the following principles best describes the basic operation of an electromagnet?
Current is induced in a conductor that is moving through a magnetic field
Like magnetic poles repel, while unlike poles attract
Current flowing through a conductor generates a magnetic field
Like magnetic poles attract, while unlike poles repel
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?
14.8 µA
10.3 µA
7.8 µA
7.75 µA
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Current and voltage are said to be in phase when:
their waveforms are both ac or both dc
they have the same amplitude and frequency
their waveforms cross through zero and reach positive and negative peaks at the same time
All of the above
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Silicon atoms combine into an orderly pattern called a
Crystal
Covalent bond
Semiconductor
Valence orbit
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
The rotating coil of wire in an electric motor is called the:
armature
brush
commutator
loop
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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