Electronic Principles - Section 1 (5)

33.

A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

A.	7.8 mA
B.	208 mA
C.	200 mA
D.	300 mA
E.	None of the above

Answer: Option B

Explanation:

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34.

Which one of the following phrases best describes residual magnetism?

A.	Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
B.	The force of attraction between the poles of a permanent and temporary magnetic field
C.	The amount of magnetic flux that is not confined to the core material of an electromagnet
D.	The circular magnetic field that surrounds a conductor carrying a current
E.	None of the above

Answer: Option A

Explanation:

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35.

Which one of the following statements best describes magnetic hysteresis?

A.	Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
B.	Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
C.	Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
D.	Hysteresis is most apparent when the core material is saturated
E.	None of the above

Answer: Option C

Explanation:

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36.

The equivalent of 1 micro A is:

A.	10000A
B.	1000 A
C.	one-millionth of an ampere
D.	one million amperes
E.	None of the above

Answer: Option C

Explanation:

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37.

Which one of the following statements best applies to a parallel RLC circuit?

A.	The voltage waveform for each component always has the same amplitude and phase as the applied voltage
B.	The sum of the current is always less than the applied current
C.	The current waveform for each component always has the same amplitude and phase as the applied current
D.	All of the above
E.	None of the above

Answer: Option A

Explanation:

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38.

What form of energy is used to maintain an imbalance of charges between the terminals of a battery?

A.	Electronical energy
B.	Mechanical energy
C.	Chemical energy
D.	Solar energy
E.	None of the above

Answer: Option C

Explanation:

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39.

Which one of the following devices is most often used for measuring opposition to current flow in a circuit?

A.	Ammeter
B.	Voltmeter
C.	Ohmmeter
D.	Wattmeter
E.	None of the above

Answer: Option C

Explanation:

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40.

How many types of flow are there in a semiconductor?

A.	0
B.	1
C.	2
D.	3
E.	None of the above

Answer: Option B

Explanation:

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