In BJT, switching losses occurs___________?
A. Only at turn – on
B. Only at turn – off
C. Both at turn on and off
D. None of these
Power Electronics
In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes_______?
In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes_______?
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)
In EMC signal, the source delivers maximum power to the input of transmission line when the transmission line input impedance
In EMC signal, the source delivers maximum power to the input of transmission line when the transmission line input impedance
A. Is equal to the source resistance
B. Greater than the source resistance
C. Smaller than the source resistance
D. None of these
As the breakdown voltage reached, the DIAC exhibits?
As the breakdown voltage reached, the DIAC exhibits?
A. Negative resistance characteristics
B. Goes into avalanche condition
C. Voltage drop snaps back
D. All of these
For swept frequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length of the transmission line would
For swept frequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length of the transmission line would
A. Decrease with frequency
B. Remains same with change in frequency
C. Increase with frequency
D. Either A. or B.
DIAC are specifically designed to trigger______________?
DIAC are specifically designed to trigger______________?
A. TRIAC
B. SCR
C. GTO
D. Only (a) and (b)
Voltage commutation circuit can be converted into a current commutation by interchanging the positions of____________?
Voltage commutation circuit can be converted into a current commutation by interchanging the positions of____________?
A. Diode and capacitor
B. Capacitor and SCR
C. Inductor and capacitor
D. Capacitor and load
In a 3 phase bridge rectifier the ripple frequency is _____________?
In a 3 phase bridge rectifier the ripple frequency is _____________?
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 load commutated DC – DC chopper, the capacitor has a_____________?
In a load commutated DC – DC chopper, the capacitor has a_____________?
A. Symmetric triangular voltage across itself
B. Symmetric rectangular voltage across itself
C. Symmetric trapezoidal voltage across itself
D. Symmetric sinusoidal voltage across itself
The sum of all phase current in a star connected primary winding with no neutral connection is equal to___________?
The sum of all phase current in a star connected primary winding with no neutral connection is equal to___________?
A. Phase current
B. Three times the phase current
C. Three times the line current
D. Zero at all times