Single correct option
Consider the following statements about transformers:
1. An ideal step-up transformer increases the electrical power.
2. A transformer works with a steady direct current supply.
Which of the statements given above is/are correct?
1. An ideal step-up transformer increases the electrical power.
2. A transformer works with a steady direct current supply.
Which of the statements given above is/are correct?
- A. 1 only
- B. 2 only
- C. Both 1 and 2
- D. Neither 1 nor 2
Show answer and solution
Answer: (D) Neither 1 nor 2
A step-up transformer raises voltage but lowers current in the same ratio, so the output power of an ideal one equals the input power; it never increases power. Statement 1 is wrong. A transformer works on mutual induction, which needs a changing flux, so a steady DC supply gives no output. Statement 2 is wrong.
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