Electrical Engg (EEE) — MCQ Practice Questions & Answers

Question 1

Which of the following is the SI unit of electric current?

Accepted Answer

Correct answer: A. Ampere — Ampere (A) is the SI base unit of electric current. It is defined as the flow of one coulomb of charge per second.

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B. Coulomb

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C. Volt

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D. Watt

Question 2

The accuracy of an electrical measuring instrument is expressed as a percentage of:

Accepted Answer

Correct answer: C. Full scale deflection — In electrical measurements, accuracy is typically expressed as a percentage of full scale deflection (FSD) or full scale reading (FSR) for analog instruments.

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A. True value

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B. Measured value

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D. Average value

Question 3

The error in an ammeter connected in series with a circuit is primarily due to:

Accepted Answer

Correct answer: B. Its non-zero internal resistance — An ideal ammeter should have zero internal resistance. Non-zero internal resistance causes voltage drop and measurement error.

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A. Its infinite internal resistance

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C. Its capacity

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D. Temperature variations

Question 4

The class of accuracy for a class 1.5 instrument means:

Accepted Answer

Correct answer: C. Accuracy of ±1.5% of full scale deflection — The accuracy class (e.g., 1.5, 2.0) indicates the maximum percentage error with respect to full scale deflection, as per IEC standards.

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A. Accuracy of ±1.5% of true value

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B. Accuracy of ±1.5% of measured value

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D. Accuracy of ±1.5 V

Question 5

The input impedance of a digital multimeter is typically:

Accepted Answer

Correct answer: C. 1 MΩ or higher — Modern digital multimeters have very high input impedance (typically 10 MΩ for voltage measurement) to minimize loading effects on the circuit.

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A. 1 kΩ

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B. 100 kΩ

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D. 10 Ω

Question 6

In a CRO (Cathode Ray Oscilloscope), the Y-deflection sensitivity is expressed in:

Accepted Answer

Correct answer: A. V/division — Y-deflection sensitivity (or gain) in CRO is expressed in volts per division, indicating how many volts are represented by each vertical division.

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B. A/division

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C. Ω/division

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D. Hz/division

Question 7

The sensitivity of a galvanometer is defined as:

Accepted Answer

Correct answer: A. Deflection per unit current — Sensitivity of a galvanometer is the deflection (in mm or degrees) produced per unit current (usually per microampere or milliampere).

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B. Current per unit deflection

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C. Resistance per unit deflection

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D. Voltage per unit current

Question 8

Which of the following is NOT a source of error in analog voltmeters?

Accepted Answer

Correct answer: C. Increase in frequency of input signal — Analog voltmeters are primarily DC devices. Frequency changes affect AC measurements but not the instrument's basic construction errors.

Answer

A. Temperature variations affecting resistance

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B. Mechanical friction in the pointer mechanism

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D. Parallax error during reading

Electrical Engg (EEE) - MCQ Practice Questions