Single correct option
Consider the following statements about a transformer:
1. It works on direct current as well as alternating current.
2. A step-up transformer has more turns in its secondary coil than in its primary coil.
Which of the statements is/are correct?
1. It works on direct current as well as alternating current.
2. A step-up transformer has more turns in its secondary coil than in its primary coil.
Which of the statements is/are correct?
- A. 1 only
- B. 2 only
- C. Both 1 and 2
- D. Neither 1 nor 2
Show answer and solution
Answer: (B) 2 only
A transformer relies on a changing magnetic flux, which direct current cannot provide in steady state, so statement 1 is wrong. Since V_s/V_p = N_s/N_p, a step-up transformer needs N_s greater than N_p, so statement 2 is correct. The current in a step-up transformer falls as voltage rises, conserving power in the ideal case.
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