Alternating Current vs Direct Current Questions and Answers
Understanding the difference between Alternating Current (AC) and Direct Current (DC) is essential for every electronics engineer. This section on AC vs DC questions with answers focuses on basic principles, applications, and problem-solving in electronics aptitude questions and answers. Exams like SSC JE, DRDO, and GATE often include conceptual and numerical problems comparing AC and DC systems. Practicing these aptitude questions with solutions PDF improves clarity on circuit behavior, power transmission, and frequency analysis — crucial for technical interviews and competitive tests.
Understand differences between AC and DC electrical supply. Also look into circuits and resonance and parallel circuits for related practical insights.
Alternating Current vs Direct Current
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17 questions
1. What are the two main applications for ac?
- direct, pulsating
- electric, magnetic
- power, information
- static, dynamic
2. The distance that a signal's energy can travel in the time it takes for one cycle to occur is called the signal's:
- amplitude
- frequency
- wavelength
- period
3. One oscilloscope selector knob that allows the major and minor divisions of the graticule to be used to determine a signal amplitude value is called the:
- time/cm control
- position control
- intensity control
- volts/cm control
4. If current varies periodically from zero to a maximum, back to zero, and then repeats, the signal is:
- direct
- alternating
- pulsating
- repetitive
6. What is the peak value of a household appliance that uses a 230 V ac source?
- 163 V
- 230 V
- 325 V
- 480 V
7. What is the waveform period difference between the 60 Hz electricity used in this country and the 50 Hz used in Europe?
- 3 ms
- 16 ms
- 4 ms
- 20 ms
8. Test equipment selection enables the technician to both generate signals and:
- change circuit conditions
- inject signals
- sense circuit conditions
- change signal frequencies
9. Why is ac current transfer more effective than dc current transfer over long distances?
- due to the height of power lines
- due to the use of ac generators
- due to step-up and step-down transformers reducing I2R losses
- due to very high voltages
10. Which percentages of full-amplitude rise time are used for a pulse wave?
- 0 to 50 percent
- 0 to 100 percent
- 5 to 95 percent
- 10 to 90 percent