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

Related Mcqs:

1. In single phase VSI, the harmonic which is not present is____________?

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

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. The ac voltage controller can be used for ___________?

   A. Lighting and heating control B. On – line transformer tap changing C. Soft starting D. All of these...

4. Under harmonic free load voltages, the 3 phase VSI_____________?

   A. Does not contains second harmonic B. Does not contains third harmonic C. Does not contains fifth harmonic D. Does not contains seventh harmonic...

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

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

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. 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...

8. In a three phase voltage source inverters____________?

   A. Only amplitude of voltage is controllable B. Only phase is controllable C. Both amplitude and phase is controllable D. Amplitude, phase and frequency of voltages should always be controllable...

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. 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...