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.Management Sciences
Category: Power Electronics
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
A carrier based PWM technique in CSI is composed of____________?
A. A switching pulse generator and a shorting pulse generator
B. A shorting pulse distributor
C. A switching and shorting pulse combination
D. All of these
In rectifiers, load current flow is_________?
A. Unidirectional
B. Bidirectional
C. Either (a) or (b)
D. Non directional
Thyristor is nothing but a____________?
A. Controlled transistor
B. Controlled switch
C. Amplifier with higher gain
D. Amplifier with large current gain
The switching function of semiconductor devices can be characterized with____________?
A. Duty ratio only
B. Frequency only
C. Duty ratio and frequency
D. Duty ratio, frequency and time delay
A combination of synchronized leading edge and trailing edge modulation has also been used to control a____________?
A. Boost single – phase power factor converter
B. A buck dc – dc converter to reduce ripple in the intermediate dc bus capacitor
C. Both A. and B.
D. None f these
SCRs are used in series to meet_______________?
A. high current demand
B. low voltage demand
C. low current demand
D. high voltage demand
To detect an over – current fault condition, the most reliable method is to connect a_____________?
A. Current sensor across IGBT
B. Voltage sensor across IGBT
C. Current sensor in series with IGBT
D. Voltage sensor in series with IGBT
Regulator sampling PWM is usually used in___________?
A. High power inverters
B. Rectifiers
C. Low power inverters
D. Only A. and B.
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