Electrical Engineering MCQs

Page No. 351

In a three phase voltage source inverters____________?


aOnly amplitude of voltage is controllable

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bOnly phase is controllable

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cBoth amplitude and phase is controllable

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dAmplitude, phase and frequency of voltages should always be controllable

✓



Under harmonic free load voltages, the 3 phase VSI_____________?


aDoes not contains second harmonic

✓


bDoes not contains third harmonic

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cDoes not contains fifth harmonic

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dDoes not contains seventh harmonic

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Double edge modulation eliminates certain harmonics when the reference is a__________?


aSine wave

✓


bSquare wave

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cTriangular wave

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dTrapezoidal wave

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View Answer Sine wave

For similar carrier and modulating signals, the line current used in CSI is__________?


a Identical to line voltage in a VSI

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b Identical to line current in VSI

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cIdentical to phase voltage in VSI

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dIdentical to phase voltage in CSI

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The carrier which are commonly used in constant – frequency PWM is______________?


aSawtooth carrier

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b Inverted sawtooth carrier

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cTriangle carrier

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dAll of these

✓


View Answer All of these

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


a5

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b7

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c11

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dAll of these

✓


View Answer All of these

A capacitive load in voltage source inverters generates ________________?


aSmall current spikes and can be reduced by using an inductive filter

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b Large current spikes and can be increased by using an inductive filter

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c Small current spikes and can be increased by using an inductive filter

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d Small current spikes and can be increased by using an inductive filter

✓



In a three phase converter, the number of notches per cycle is____________?


aOne

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bThree

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cSix

✓


dNine

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View Answer Six

The main objective of static power converters is to____________?


aObtain an dc output waveform from a dc power supply

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bObtain an ac output waveform from a dc power supply

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cObtain an dc output waveform from a dc power supply

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dObtain an ac output waveform from a ac power suppl

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


aVoltage mode control

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bCurrent mode control

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cHysteric control

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dAll of these

✓


View Answer All of these

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