A. Only at turn – on
B. Only at turn – off
C. Both at turn on and off
D. None of these
In BJT, switching losses occurs___________? Read More »
Power Electronics A. Do not contribute to the collector current
B. Result in net current flow component into the base
C. Contribute to the collector current
D. Only (a) and (b)
E. Only (b) and (c)
A. Is equal to the source resistance
B. Greater than the source resistance
C. Smaller than the source resistance
D. None of these
A. Negative resistance characteristics
B. Goes into avalanche condition
C. Voltage drop snaps back
D. All of these
As the breakdown voltage reached, the DIAC exhibits? Read More »
Power Electronics A. Decrease with frequency
B. Remains same with change in frequency
C. Increase with frequency
D. Either A. or B.
A. TRIAC
B. SCR
C. GTO
D. Only (a) and (b)
DIAC are specifically designed to trigger______________? Read More »
Power Electronics A. Diode and capacitor
B. Capacitor and SCR
C. Inductor and capacitor
D. Capacitor and load
A. Equal to the input frequency
B. Twice the input frequency
C. Three times the input frequency
D. Six times the input frequency
In a 3 phase bridge rectifier the ripple frequency is _____________? Read More »
Power Electronics A. Symmetric triangular voltage across itself
B. Symmetric rectangular voltage across itself
C. Symmetric trapezoidal voltage across itself
D. Symmetric sinusoidal voltage across itself
In a load commutated DC – DC chopper, the capacitor has a_____________? Read More »
Electrical Engineering Mcqs, Power Electronics A. Phase current
B. Three times the phase current
C. Three times the line current
D. Zero at all times
