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Alternating Current and Voltage - Engineering

Q1:

A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of

A 0.0045 s

B 2 ms

C 1.5 ms

D 3,000 s

ANS:A - 0.0045 s

f=1/t So except option A all are bigger then 4 ms.

Lets see 1/4ms = 1000/4 = 250.

A = 1/0.0045 = 222. 22.

B = 1000/2 = 500.

C = 1000/1.5 = 666.66.

D = 1000000/3000= 333.33.

So clearly option is A.