Q12. Which of the following statements are collect about transformers?
A. Transformers cannot be use

Q: What is the correct answer for CUET UG Physics Q12?

The correct answer is D. Let's analyze each statement about transformers: **A. Transformers cannot be used to step up DC.** This statement is correct. Transformers operate on the principle of mutual induction, which requires a constantly changing magnetic flux. A direct current (DC) produces a constant magnetic flux, so a transformer will not function with DC to step up or step down voltage. **B. The frequency of output a

Q: Q12. Which of the following statements are collect about transformers? A. Transformers cannot be used to step up DC. B. The frequency of output across the secondary is always equal to the frequency…

The correct answer is D. Let's analyze each statement about transformers: **A. Transformers cannot be used to step up DC.** This statement is correct. Transformers operate on the principle of mutual induction, which requires a constantly changing magnetic flux. A direct current (DC) produces a constant magnetic flux, so a transformer will not function with DC to step up or step down voltage. **B. The frequency of output a

Q: What are the options for this CUET UG Physics question?

A. A, B, C · B. B, C, D · C. C, D, A · D. A, B, D, E

Question

Q12. Which of the following statements are collect about transformers?
A. Transformers cannot be used to step up DC.
B. The frequency of output across the secondary is always equal to the frequency of input across the primary.
C. The output power of a transformer may be increased to a value which is more than the input power.
D. Transformation ratio is equal to turns ratio.
E. In a step-up transformer, secondary current is less than primary current.
Choose the correct answer from the options given below:
(a) A, B, C
(b) B, C, D
(c) C, D, A
(d) A, B, D, E

FirstInTest · Accepted Answer

Let's analyze each statement about transformers:
**A. Transformers cannot be used to step up DC.** This statement is correct. Transformers operate on the principle of mutual induction, which requires a constantly changing magnetic flux. A direct current (DC) produces a constant magnetic flux, so a transformer will not function with DC to step up or step down voltage.
**B. The frequency of output across the secondary is always equal to the frequency of input across the primary.** This statement is correct. A transformer transfers electrical energy from primary to secondary coil without changing the frequency of the AC signal.
**C. The output power of a transformer may be increased to a value which is more than the input power.** This statement is incorrect. According to the law of conservation of energy, output power can never exceed input power. In an ideal transformer, output power equals input power (P_out = P_in). In a real transformer, output power is always less than input power due to losses (e.g., eddy current losses, hysteresis losses, copper losses).
**D. Transformation ratio is equal to turns ratio.** This statement is correct. The transformation ratio (k) is defined as the ratio of secondary voltage to primary voltage (V_s/V_p) and is ideally equal to the ratio of the number of turns in the secondary coil to the number of turns in the primary coil (N_s/N_p).
**E. In a step-up transformer, secondary current is less than primary current.** This statement is correct. A step-up transformer increases voltage (V_s > V_p). To maintain power conservation (P = VI, assuming an ideal transformer P_in = P_out), if voltage increases, the current must decrease. Therefore, I_s < I_p.
Combining the correct statements, A, B, D, and E are correct.

Answer

A, B, C

Answer

B, C, D

Answer

C, D, A

Answer

A, B, D, E

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