RRB Technician 2013 Ques 28
Question: A 100% efficient transformer has 100 turns in the primary and 25 turns in its secondary coil. If the current in the secondary coil is 4 A, then the current in the primary coil is
Options:
A) 16 A
B) 8 A
C) 4 A
D) 1 A
Show Answer
Answer:
Correct Answer: D
Solution:
- In transformer, $ \frac{N _1}{N _2}=\frac{l _2}{l _1} $ if there are no losses $ \frac{100}{25}=\frac{4}{l _1} $
$ \Rightarrow $ $ l _1=\frac{25\times 4}{100}=\frac{100}{100}=1,A $
BETA
