Computer Programming MCQs

5739 MCQs  (Page 93 of 574)

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
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
Very large values of modulation index (greater than 3.24) lead to___________?
A. Square ac output voltage
B. Sine ac output voltage
C. Triangular ac output voltage
D. Trapezoidal ac output voltage
In a push – pull converter, the filter capacitor can be obtained as____________?
A. Cmin = v / ( vr l f2 )
B. Cmin= ( 1 – d ) v / ( vr l f2 )
C. Cmin= ( 1 – 2 d ) v / 32 ( vr l f2 )
D. Cmin= ( 1 – 2 d ) v / 42 ( vr l f2 )
MOSFET stands for______________?
A. metal – oxide semiconductor field effect transistor
B. molybdenum – oxide semiconductor field effect transistor
C. metal – oxide silicon field effect transistor
D. metal – oxide semiconductor field effect transmitter
In a flyback converter, the inductor of the buck-boost converter has been replaced by a_____________?
A. Flyback capacitor
B. Flyback resistor
C. Flyback transformer
D. Flyback transistor
Advantages of Cuk converter is / are_____________?
A. Large number of reactive component
B. Low stress on switch
C. Low stress on capacitor
D. None of these
A MOSFET, for its conduction uses_____________?
A. Only minority carriers
B. Only majority carriers
C. Both minority and majority carriers
D. None of these
An RC snubber network used in BJT__________?
A. Divert the collector current during turn – off
B. Improves the reverse bias safe operating area
C. Dissipates a fair amount of switching power
D. All of these
The ac output voltage waveform of VSI and AC output current waveform of CSI respectively is composed of___________?
A. High dv / dt, low di / dt
B. Low dv / dt, low di / dt
C. Low dv / dt, high di / dt
D. High dv / dt, high di / dt