In a three phase voltage source inverters____________?

Related Mcqs:

1. 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

2. A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is _____?

   A. 30° to 150°.
   B. 30° to 180°.
   C. 60° to 120°.
   D. 60° to 180°.

3. n a phase controlled 3 phase ac voltage controller, the harmonic present is__________?

   A. 2nd
   B. 3rd
   C. 5th
   D. 7th

4. For an SCR gate – cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance_____?

   A. 111.9 Ω.
   B. 11.19 Ω.
   C. 108 Ω.
   D. 115 Ω

5. A capacitive load in voltage source inverters generates ________________?

   A. Small current spikes and can be reduced by using an inductive filter
   B. Large current spikes and can be increased by using an inductive filter
   C. Small current spikes and can be increased by using an inductive filter
   D. Large current spikes and can be reduced by using an inductive filter

6. A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is_____?

   A. 0.32
   B. 0.67
   C. 0.45
   D. 0.27

7. Under over voltage condition impedance offered by the voltage clamping device is__________?

   A. low
   B. High
   C. moderate
   D. infinity

8. In a single phase full wave rectifier, during blocking state the pea inverse voltage of diode is______________?

   A. V m
   B. 2 V m
   C. V m / 2
   D. 4 V m

9. In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________________?

   A. Positive
   B. Negative
   C. Zero
   D. None of these

10. In a 3 phase CSI, if the required line output voltages are balanced and 120 degree out of phase, then the chopping angles are used to eliminate only the harmonics at frequencies

    A. 5
    B. 7
    C. 11
    D. All of these