AC Fundamentals, Circuit and Circuit Theory The power factor of a D.C. circuit is always Unity Greater than unity Less than unity Zero Unity Greater than unity Less than unity Zero ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory Magnitude of current at resonance in R-L-C circuit Depends upon the magnitude of R Depends upon the magnitude of R, Land C Depends upon the magnitude of L Depends upon the magnitude of C Depends upon the magnitude of R Depends upon the magnitude of R, Land C Depends upon the magnitude of L Depends upon the magnitude of C ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of Skin effect Capacitive effect between adjacent coil turns Increase in temperature Iron loss in core Skin effect Capacitive effect between adjacent coil turns Increase in temperature Iron loss in core ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The time constant of a series R-C circuit is given by R2C RC2 RC R/C R2C RC2 RC R/C ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 ohm. If frequency is increased to 100 Hz, reactance becomes __________ ohms. 15 10 5 25 15 10 5 25 ANSWER DOWNLOAD EXAMIANS APP
AC Fundamentals, Circuit and Circuit Theory Which of the following statements pertains to resistors only? Can act as energy storage devices Can dissipate considerable amount of power Connecting them in parallel increases the total value Oppose sudden changes in voltage Can act as energy storage devices Can dissipate considerable amount of power Connecting them in parallel increases the total value Oppose sudden changes in voltage ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS