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Which of the following statements is NOT true about DC signal?

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SSC JE Electrical 05 Jun 2024 Shift 3 Official Paper - 1
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  1. Pure Direct Current always has a constant value.
  2. A DC voltage has both positive and negative values with change in time.
  3. A DC voltage is always negative or always positive.
  4. Cell, batteries and regulated power supplies provide a steady DC that is ideal for an electronic circuit.

Answer (Detailed Solution Below)

Option 2 : A DC voltage has both positive and negative values with change in time.
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Detailed Solution

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Aspect AC Signal DC Signal
Direction of Current Periodically changes direction Always flows in the same direction
Voltage Polarity Alternates between positive and negative Remains constant (either positive or negative)
Common Applications Power distribution (grid electricity), motors, generators Battery-powered devices, electronics, charging batteries
Examples Household appliances, lighting, air conditioners Mobile phone batteries, flashlights, electric vehicles
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Latest SSC JE EE Updates

Last updated on Jul 1, 2025

-> SSC JE Electrical 2025 Notification is released on June 30 for the post of Junior Engineer Electrical, Civil & Mechanical.

-> There are a total 1340 No of vacancies have been announced. Categtory wise vacancy distribution will be announced later.

-> Applicants can fill out the SSC JE application form 2025 for Electrical Engineering from June 30 to July 21.

-> SSC JE EE 2025 paper 1 exam will be conducted from October 27 to 31. 

-> Candidates with a degree/diploma in engineering are eligible for this post.

-> The selection process includes Paper I and Paper II online exams, followed by document verification.

-> Prepare for the exam using SSC JE EE Previous Year Papers.

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