Electronic Principles MCQ Questions & Answers

11

How many types of flow are there in a semiconductor?

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

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Answer & Solution

Answer: Option B

Solution:

The correct answer is C: 2
Here's why:
In a semiconductor, there are two main types of charge carriers that contribute to current flow:
1. Electrons: These are negatively charged particles.
2. Holes: These are the absence of electrons, effectively acting as positive charge carriers. Think of them as bubbles in a liquid; when a bubble moves, it's the liquid moving around it that creates the bubble's apparent movement.
Therefore, there are two types of flow (electron flow and hole flow) in a semiconductor.

12

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

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Answer & Solution

Answer: Option C

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13

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

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Answer & Solution

Answer: Option C

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14

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

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Answer & Solution

Answer: Option A

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15

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

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Answer & Solution

Answer: Option C

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16

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

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Answer & Solution

Answer: Option C

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17

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

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Answer & Solution

Answer: Option A

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18

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

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Answer & Solution

Answer: Option B

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19

Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?

A) P = I²R B) P = IE C) P = E²/R D) I = P/E E) None of the above

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Answer & Solution

Answer: Option D

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20

Which one of the following phrases most accurately describes a purely inductive circuit?

A) Resistances provide the only opposition to current flow B) Inductive reactance provides the only opposition to current flow C) Combinations of resistance and inductive reactance provide any opposition to current flow D) The ac voltage lags the current by 90 degree E) None of the above

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Answer & Solution

Answer: Option B

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Electronic Principles MCQ Questions & Answers | Computer Science