For a buck converter to reduce the conduction losses in diode

Related Mcqs:

1. In a flyback converter, the inductor of the buck-boost converter has been replaced by a_____________?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

2. The advantage of using free – wheeling diode in half controlled bridge converter is that

   A. There is always a path for the dc current independent of the ac line
   B. There is always a path for the ac current independent of the ac line
   C. There is always a path for the dc current dependent of the ac line
   D. There is always a path for the ac current independent of the ac line

3. The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is___________?

   A. 130 μs
   B. 135 μs
   C. 140 μs
   D. 145 μs

4. Compared to transistor, _________ have lower on state conduction losses and higher power handling capability?

   A. TRIACs
   B. Semi conductor diodes
   C. MOSFETs
   D. Thyristor

5. The conduction losses in IGBT is____________?

   A. More than that of MOSFET
   B. Lower than that of MOSFET
   C. Equal to that of MOSFET
   D. Equal to that of BJT

6. The control method used for PWM dc – dc converter is______________?

   A. Voltage mode control
   B. Current mode control
   C. Hysteric control
   D. All of these

7. 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

8. In the operation and control of both naturally commutated and forced commutated SCR base converter, commutation plays an important role. The converters is / are ___________?

   A. AC – DC
   B. DC – DC
   C. DC – AC
   D. All of these

9. For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?

   A. Three inductances
   B. Three capacitances
   C. Three resistance
   D. Three transistors

10. 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 )