FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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Prepare for the FAA AMT Airframe Exam with our comprehensive quiz. This resource offers multiple-choice questions designed to enhance your knowledge and understanding of aviation maintenance concepts.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

If the (+) terminal of a voltmeter is connected to the (-) terminal of the voltage source and the (-) terminal of the meter is connected to the (+) terminal of the source voltage, the voltmeter will read?

normally
backwards
zero
infinity

The correct answer is: backwards

When the polarity of a voltmeter is reversed with respect to the polarity of the voltage source it is measuring, the voltmeter will read backwards. This means that the reading displayed by the voltmeter will be the negative value of the actual voltage present. This is an important concept to understand in electrical measurements as reversing the leads of a voltmeter can lead to misinterpretation of voltage values. Option A (normally) is incorrect because reversing the polarity of the voltmeter does not lead to a normal reading. Option C (zero) is incorrect because the voltage is still present, but the voltmeter will read the negative value. Option D (infinity) is incorrect because reversing the leads does not cause an infinite reading, it causes a reverse (negative) reading.