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Agniveer Air Force Alternating Current — practice questions

Explore 20 free Alternating Current questions in Agniveer Air Force Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Alternating Current questions and exercises with answers

Showing questions 1–20 of 20.

The effective value of an alternating current is called its:Read the answer and worked solution →The household line voltage of 220 V is which kind of value?Read the answer and worked solution →An inductor in an ac circuit offers:Read the answer and worked solution →A capacitor in an ac circuit offers:Read the answer and worked solution →The SI unit of reactance is the:Read the answer and worked solution →The total opposition of an ac circuit is called its:Read the answer and worked solution →Alternating voltages are stepped up or down by means of:Read the answer and worked solution →The rms current equals the dc current that would produce the same:Read the answer and worked solution →At resonance in a series LCR circuit, the impedance is:Read the answer and worked solution →At resonance the current amplitude in the circuit is:Read the answer and worked solution →Besides an inductor, resonance needs the circuit to contain a:Read the answer and worked solution →The quantity cos of the phase angle is called the:Read the answer and worked solution →A current that dissipates no power is referred to as:Read the answer and worked solution →Maximum power is dissipated in a series LCR circuit at:Read the answer and worked solution →Inductive reactance is directly proportional to the:Read the answer and worked solution →At the resonant frequency, the two reactances are:Read the answer and worked solution →A radio is tuned to a station by matching the resonant frequency of:Read the answer and worked solution →Resonance is described as a phenomenon that is:Read the answer and worked solution →The impedance of a series LCR circuit at resonance equals:Read the answer and worked solution →A lagging wattless current is neutralised by adding an equal:Read the answer and worked solution →

Worked practice questions

The effective value of an alternating current is called its:

  1. Root mean square
  2. Peak to peak sum
  3. Average deviation
  4. Total resistance
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Correct answer: A. Root mean square

1. An alternating current keeps reversing direction. 2. Its simple average over a cycle is zero. 3. The useful measure is the root mean square value. 4. So the answer is root mean square. _Source: syllabus Physics, Ch 7 'Alternating Current'_

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The household line voltage of 220 V is which kind of value?

  1. A sum value
  2. An rms value
  3. A peak value
  4. A mean value
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Correct answer: B. An rms value

1. Supply voltages are quoted in one standard way. 2. The peak of the household supply is higher than 220 V. 3. The quoted 220 V is an rms value. 4. So the answer is an rms value. _Source: syllabus Physics, Ch 7 'Alternating Current'_

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An inductor in an ac circuit offers:

  1. Negative resistance
  2. Resonant frequencies
  3. Inductive reactance
  4. Capacitive reactance
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Correct answer: C. Inductive reactance

1. An inductor opposes changes in current. 2. That opposition acts like a resistance in an ac circuit. 3. It is called inductive reactance. 4. So the answer is inductive reactance. _Source: syllabus Physics, Ch 7 'Alternating Current'_

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