Power electronics essentially deals with control of a.c. power at____________?
A. Frequencies above 20 kHz
B. Frequencies above 1000 kHz
C. Frequencies less than 10 Hz
D. 50 Hz frequency
For similar carrier and modulating signals, the line current used in CSI is_____________?
A. Identical to line voltage in a VSI
B. Identical to line current in VSI
C. Identical to phase voltage in VSI
D. Identical to phase voltage in CSI
During the commutation period in 3 phase converter, overlap time is____________?
A. Dependent on the load current
B. Dependent on the voltage
C. Dependent on both the load current and load voltage behind the short circuit current
D. Independent on both the load current and load voltage
The effects of EMI can be reduced by_____________?
A. Suppressing emissions
B. Reducing the efficiency of the coupling path
C. Reducing the susceptibility of the receptor
D. All of these
An SCR is made up of silicon because_____________?
A. silicon has large leakage current than germanium
B. silicon has small leakage current than germanium
C. silicon has small leakage voltage than germanium
D. silicon has large leakage voltage than germanium
AC power in a load can be controlled by using_____________?
A. two SCR’s in parallel opposition
B. two SCR’s in series
C. three SCR’s in series
D. four SCR’s in series