Transistors MCQ Questions & Answers | Electrical Engineering

31

$${{\text{I}}_{\text{C}}} = \beta \,{{\text{I}}_{\text{B}}}\, + \,........$$

A) $${{\text{I}}_{{\text{CBO}}}}$$ B) $${{\text{I}}_{\text{C}}}$$ C) $${{\text{I}}_{{\text{CEO}}}}$$ D) $$\alpha {{\text{I}}_{\text{E}}}$$

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Answer & Solution

Answer: Option C

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32

For faithful amplification by a transistor circuit, the value of VBE should ___________ for a silicon transistor

A) Be zero B) Be 0.01 V C) Not fall below 0.7 V D) Be between 0 V and 0.1 V

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Answer & Solution

Answer: Option C

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33

An ideal value of stability factor is ___________

A) 100 B) 200 C) More than 200 D) 1

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Answer & Solution

Answer: Option D

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34

At series or parallel resonance, the circuit power factor is ___________

A) 0% B) 5% C) 10% D) 8%

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Answer & Solution

Answer: Option C

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35

The relation between $$\beta $$ and $$\alpha $$ is ___________.

A) $$\beta = \frac{1}{{1 - \alpha }}$$ B) $$\beta = \frac{{1 - \alpha }}{\alpha }$$ C) $$\beta = \frac{\alpha }{{1 - \alpha }}$$ D) $$\beta = \frac{\alpha }{{1 + \alpha }}$$

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Answer & Solution

Answer: Option C

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36

If Q of an LC circuit increases, then bandwidth ___________

A) Increases B) Decreases C) Remains the same D) Insufficient data

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Answer & Solution

Answer: Option B

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37

In a transistor ___________

A) IC = IE + IB B) IB = IC + IE C) IE = IC - IB D) IE = IC + IB

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Answer & Solution

Answer: Option D

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38

The leakage current in CE arrangement is ___________ that in CB arrangement

A) more than B) less than C) the same as D) none of the above

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Answer & Solution

Answer: Option A

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39

In the double tuned circuit, if the mutual inductance between the two tuned circuits is decreased, the level of resonance curve ___________

A) Remains the same B) Is lowered C) Is raised D) None of the above

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Answer & Solution

Answer: Option B

Solution:

The correct answer is Is lowered.

In a double-tuned circuit, the mutual inductance between the two tuned circuits determines the coupling between them.

If the mutual inductance is decreased, the coupling between the circuits is weakened, resulting in a lower peak of the resonance curve.

This happens because reduced coupling limits the transfer of energy between the circuits, thereby lowering the amplitude of the resonance.

The other options do not accurately describe the effect of decreased mutual inductance on the resonance curve.

40

The arrow in the symbol of a transistor indicates the direction of ___________

A) electron current in the emitter B) electron current in the collector C) hole current in the emitter D) donor ion current

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Answer & Solution

Answer: Option C

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