Question 1

A diode electron tube such as a valve tube

Accepted Answer

A)  is used for amplification.
B)  has a negatively charged anode.
C)  is used to vary the primary voltage.
D)  can be used for rectification.

Question 2

The process of electrons being emitted from heated metallic surfaces is called

Accepted Answer

A)  thermionic emission.
B)  electrolysis.
C)  electroplating.
D)  potential difference.

Question 3

A magnetic field is produced by

Accepted Answer

A)  electric charges at rest.
B)  electric charges in motion.
C)  permanent magnets only.
D)  electric charges both at rest and in motion.

Question 4

The inherent power loss of electrical conduction through solid wire conductors

Accepted Answer

A)  is minimized with higher voltage transmission.
B)  has no relationship with current flow.
C)  results from space charge.
D)  is lower with current flow rather than electron flow.

Question 5

The turns ratio of a transformer is determined by the

Accepted Answer

A)  size of the wire.
B)  type of wire.
C)  number of windings.
D)  space between the transformer sides.

Question 6

All of the following are true of transformers EXCEPT:

Accepted Answer

A)  They have no moving parts.
B)  They work on the principle of mutual induction.
C)  They work most efficiently on pulsating DC.
D)  They are designed to regulate voltage.

Exam 4: Electromagnetism

A diode electron tube such as a valve tube

Correct Answer
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The process of electrons being emitted from heated metallic surfaces is called

Correct Answer
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A magnetic field is produced by

Correct Answer
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The turns ratio of a transformer is determined by the

Correct Answer
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The inherent power loss of electrical conduction through solid wire conductors

Correct Answer
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All of the following are true of transformers EXCEPT:

Correct Answer
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Exam 4: Electromagnetism

A diode electron tube such as a valve tube

Correct AnswerverifiedShow Answer

The process of electrons being emitted from heated metallic surfaces is called

Correct AnswerverifiedShow Answer

A magnetic field is produced by

Correct AnswerverifiedShow Answer

The turns ratio of a transformer is determined by the

Correct AnswerverifiedShow Answer

The inherent power loss of electrical conduction through solid wire conductors

Correct AnswerverifiedShow Answer

All of the following are true of transformers EXCEPT:

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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