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Free Online Mock Physics Multiple Choice Test on AC transformers
Sub Category : AC transformers Test : 1 Time Left :
1) If instantaneous current is given by i=4 cos (omegat+phi)amp,then the r.m.s value of current is (1) 2 square root 1 A (2) 4A (3) 4 square root 2 A (4) 0A
  1 2 3 4
2) In an A.C. circuit V and I are given by V=100 sin (100t) volt,I=100 sin(100 t+π/3)mA.The power dissipated in circuit is(1) 2.4W (2) 10power4W (3) 10W (4)5W
  1 2 3 4
3) The potential difference V across an instrument in an A.C. circuit carying current I of frequency f are given by V=5cos omegat volt and I=2 sin omegat amp(where omega = 2πf).The power dissipated in the instrument is (1) Zero (2) 10W (3) 5W (4) 2.5W
1 2 3 4
4) The phase angle, in radian,between e.m.f.and current in L.C.R. series A.C. circuit is (1) 0 to π/2 (2) π/4 (3) π/2 (4) π
1 2 3 4
5)In an A.C. circuit, peak value of voltage is 423 volt. Its effective voltage is
(1)300 V (2) 323 V (3) 400 V (4) 340 V
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