Single phase DC - AC Inverters - Electrical Engineering (MCQ) questions and answers

1)   In single phase VSI, the harmonic which is not present is

a. 2nd
b. 3rd
c. 5th
d. 7th
Answer  Explanation 

ANSWER: 2nd

Explanation:
No explanation is available for this question!
2)   Very large values of modulation index (greater than 3.24) lead to

a. Square AC output voltage
b. Sine AC output voltage
c. Triangular AC output voltage
d. Trapezoidal AC output voltage
Answer  Explanation 

ANSWER: Square AC output voltage

Explanation:
No explanation is available for this question!
3)   Single phase VSI are mainly used in

a. Power supplies
b. Ups
c. Multilevel configuration
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
4)   In the SPWM, the modulating signal is

a. Square
b. Sinusoidal
c. Triangular
d. Saw - tooth
Answer  Explanation 

ANSWER: Sinusoidal

Explanation:
No explanation is available for this question!
5)   In a full bridge VSI, in order to avoid the short circuit across the DC bus and the undefined AC output voltage condition, the modulating technique should ensure that

a. Top switch of each leg is on at any instant
b. Bottom switch of each leg is on at any instant
c. Either (a) or (b)
d. None of these
Answer  Explanation 

ANSWER: Either (a) or (b)

Explanation:
No explanation is available for this question!
6)   In a lossless inverter, the average power absorbed in one period by the load must be

a. Equal to the average power supplied by the dc source
b. Greater than the average power supplied by the dc source
c. Lesser than the average power supplied by the dc source
d. Equal to the average power supplied by the ac source
Answer  Explanation 

ANSWER: Equal to the average power supplied by the dc source

Explanation:
No explanation is available for this question!
7)   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
Answer  Explanation 

ANSWER: Regenerative mode operation

Explanation:
No explanation is available for this question!
8)   The ac output voltage waveform of VSI and AC output current waveform of CSI respectively is composed of

a. High dv / dt, low di / dt
b. Low dv / dt, low di / dt
c. Low dv / dt, high di / dt
d. High dv / dt, high di / dt
Answer  Explanation 

ANSWER: High dv / dt, high di / dt

Explanation:
No explanation is available for this question!
9)   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
Answer  Explanation 

ANSWER: Large current spikes and can be reduced by using an inductive filter

Explanation:
No explanation is available for this question!
10)   The main objective of static power converters is to

a. Obtain an dc output waveform from a dc power supply
b. Obtain an ac output waveform from a dc power supply
c. Obtain an dc output waveform from a dc power supply
d. Obtain an ac output waveform from a ac power supply
Answer  Explanation 

ANSWER: Obtain an ac output waveform from a dc power supply

Explanation:
No explanation is available for this question!

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