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31. The output current in PWM DC – DC converters is equal to___________?
A. Average value of the output inductor current
B. Product of an average inductor current and a function of duty ratio
C. Either A. or B.
D. None of these
32. The opposite of susceptibility is___________?
A. Immunity
B. Emission
C. Interference
D. Electromagnetic compatibility
33. The ability of an electronic system to function properly in its intended electromagnetic environment and should not be a source of pollution to that electromagnetic environment is known as____________?
A. Susceptibility
B. Emission
C. Interference
D. Electromagnetic compatibility
34. If all the SCR’s of 3 phase PAC is replaced by diodes, they would be triggered_____________?
A. 120 degree after the zero crossing of the corresponding line voltages
B. 60 degree after the zero crossing of the corresponding line voltages
C. 120 degree before the zero crossing of the corresponding line voltages
D. 60 degree before the zero crossing of the corresponding line voltages
35. 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
36. 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
37. In a 3 phase VSI SPWM to use a single carrier signal and preserve the features of PWM technique, the normalized carrier frequency should be____________?
A. Multiple of two
B. Odd multiple of three
C. Odd multiple of five
D. Odd multiple of seven
38. Regulator sampling PWM is usually used in___________?
A. High power inverters
B. Rectifiers
C. Low power inverters
D. Only A. and B.
39. A combination of synchronized leading edge and trailing edge modulation has also been used to control a____________?
A. Boost single – phase power factor converter
B. A buck dc – dc converter to reduce ripple in the intermediate dc bus capacitor
C. Both A. and B.
D. None f these
40. If energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as___________?
A. Motoring mode operation
B. Braking mode operation
C. Regenerative mode operation
D. None of these