Electronics & Instrumentation MCQ Questions & Answers

Electronics & Instrumentation MCQ Questions & Answers | Electrical Engineering

Learn Electronics & Instrumentation MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Electronics & Instrumentation MCQ question is the important chapter for a Electrical Engineering and GATE students. Page-4 section-1

An ideal ammeter has ___________ resistance.

A) Low B) Infinite C) Zero D) High

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Answer & Solution

Answer: Option C

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LVDT is an/a ___________ transducer.

A) Magneto-strict ion B) Inductive C) Resistive D) Eddy current

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Answer & Solution

Answer: Option D

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Piezo – electric transducers work when we apply _____________ to it.

A) Mechanical force B) Vibrations C) Illuminations D) Heat

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Answer & Solution

Answer: Option A

Solution:

Piezo-electric transducers operate based on the piezoelectric effect, which is the ability of certain materials to generate an electric charge when subjected to mechanical stress.

When a mechanical force is applied to a piezoelectric material, it produces a proportional voltage across its surfaces.

This property is widely used in sensors, actuators, and measurement instruments.

Option B (Vibrations) is incorrect because while vibrations may cause mechanical stress, it is the force behind the vibration that activates the piezoelectric effect.

Option C (Illuminations) and Option D (Heat) are unrelated to the working principle of piezoelectric transducers.

Therefore, the correct answer is Option A.

A chopper amplifier

A) Converts AC signal from low frequency to high frequency B) Converts DC signal from low frequency to high frequency C) Converts AC signal from low frequency to DC high frequency D) Converts DC signal from low frequency to DC high frequency

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Answer & Solution

Answer: Option B

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The sensitivity factor of strain gauge is normally of the order of

A) 1 to 1.5 B) 1.5 to 2.0 C) 0.5 to 1.0 D) 5 to 10

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Answer & Solution

Answer: Option B

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The change in resistance of a metal wire owing to strain is due to
S1: Change in dimension of wire expressed by factor (1-2µ)
S2: Change in resistance ?

A) S1 is true & S2 is false B) S2 is true & S1 is false C) Both S1 & S2 are true D) Both S1 & S2 are false

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Answer & Solution

Answer: Option B

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The amplifier gain varies with frequency. This happens mainly due to

A) Miller effect B) Presence of external and internal capacitance C) Logarithmic increase in its output D) Inter stage transformer

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Answer & Solution

Answer: Option B

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The negative feed back in an amplifier

A) Reduces voltage gain B) Increases the voltage gain C) Increases the gain band width product D) Reduces the input impedances

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Answer & Solution

Answer: Option A

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The improper response time of the amplifier in the biomedical recorders

A) Affects the gain of the amplifier B) Delays the signals C) Changes the shape of the waveform of the signal D) Attenuates the signals

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Answer & Solution

Answer: Option C

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Which of the following are piezo electric substances?
1. Barium titanate
2. Lead titanate
3. Lead Zirconate
4. Cadmium and sulphate

A) 1, 2 and 4 B) 1, 3 and 4 C) 1, 2 and 3 D) 2, 3 and 4

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Answer & Solution

Answer: Option C

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