A.C FUNDAMENTALS ,CKT AND CKT THEORY OBJECTIVE QUESTIONS WITH EXPLANATIONS

A.C FUNDAMENTALS ,CKT AND CKT THEORY OBJECTIVE QUESTIONS WITH EXPLANATIONS

Q no 1 An AC current is given by i = 200 sin 100πt .it will achieve a value of 100A after ........second.

             a ) 1/900

             b ) 1/800

             c ) 1/700

             d ) 1/600

explanations 

                  answer d ) 1/600

Q no 2. If two sinusoids of the same frequency but of different amplitudes and phase angles are                       subtracted , the resultant is

             a ) a sinusoid of the same frequency

             b ) a sinusoid of half the original frequency

             c ) a sinusoid of double the frequency

             d ) not a sinusoid

explanations 

                  answer   a ) a sinusoid of the same frequency

Q no 3 . The peak value of a sine wave is 200V. its average value is

              a ) 127.4V

              b ) 141.4V

              c ) 282.8V

              d ) 200V

explanations 

                  answer  a ) 127.4V