For bidirectional operation of converters____________?

Related Mcqs:

1. Bidirectional semiconductor device is___________?

   A. Diode
   B. BJT
   C. SCR
   D. TRIAC

2. The square wave operation of 3 phase VSI lines contains the harmonics. The amplitudes are____________?

   A. Directly proportional to their harmonic order
   B. Inversely proportional to their harmonic order
   C. Not related to their harmonic order
   D. None of these

3. 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

4. In a square – wave operation of 3 phase CSIs, the power values are on for___________?

   A. 60 degree
   B. 90 degree
   C. 120 degree
   D. 150 degree

5. In square wave operation mode of 3 phase VSI, the VSI

   A. Can control the load voltage
   B. Cannot control the load voltage
   C. Cannot control the load voltage except by means of dc link voltage
   D. Cannot control the load voltage except by means of dc link current

6. Which semiconductor device acts like a diode and two transistor?

   A. UJT
   B. Diac
   C. Triac
   D. SCR

7. Which one is most suitable power device for high frequency (>100 KHz) switching application?

   A. BJT
   B. Power MOSFET
   C. Schottky diode
   D. Microwave transistor

8. A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. value of n will be___________?

   A. 60
   B. 70
   C. 80
   D. 90

9. 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

10. In rectifiers, load current flow is_________?

    A. Unidirectional
    B. Bidirectional
    C. Either (a) or (b)
    D. Non directional