Electronic Principles MCQ Questions & Answers

41

Which one of the following phrasers best describes flux density?

A) The concentration of lines of magnetic force B) The rate of change of the number of lines of magnetic force C) The opposition to a build-up of magnetic fields D) The force that maintains lines of force E) None of the above

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Answer & Solution

Answer: Option A

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42

Which is the most widely used semiconductor?

A) Copper B) Silicon C) Germanium D) All of the above E) None of the above

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Answer & Solution

Answer: Option B

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43

The transistor has a current gain of 175. If the base current is 0.1 mA, what is the collector current?

A) 1750 mA B) 17.5 mA C) 175 mA D) 1.75 mA E) None of the above

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Answer & Solution

Answer: Option B

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44

An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

A) Doping B) Valence electrons C) Free electrons D) Thermal energy E) None of the above

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Answer & Solution

Answer: Option D

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45

Which one of the following statements is true?

A) Power dissipation of a pure inductor decreases with operating frequency B) Power dissipation of a pure inductor is at a maximum for dc source voltages C) Power dissipation of a pure inductor increases with operating frequency D) There is no meaningful relationship between the power dissipation of a pure inductor and its operating frequency E) None of the above

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Answer & Solution

Answer: Option D

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46

An audio transformer has a turn ratio of 9, What is its impedance ratio?

A) 81 B) 85 C) 6 D) 9 E) None of the above

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Answer & Solution

Answer: Option A

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47

Which one of the following statements is true?

A) The secondary voltage for a step-down power transformer is greater than the primary voltage B) The secondary current for a step-down power transformer is greater than the primary voltage C) Parallel RLC circuit operated below its resonant frequency D) purely resistive circuit E) None of the above

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Answer & Solution

Answer: Option B

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48

How many protons does the nucleus of a silicon atom contain?

A) 4 B) 29 C) 14 D) 48 E) None of the above

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Answer & Solution

Answer: Option C

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49

A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

A) 3 V B) 16 V C) 7.5 V D) 8 V E) None of the above

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Answer & Solution

Answer: Option A

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50

The emitter diode is usually

A) Forward-biased B) Reverse-biased C) Nonconducting D) Operating in the breakdwon region E) None of the above

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Answer & Solution

Answer: Option A

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Electronic Principles MCQ Questions & Answers | Computer Science