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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Power Electronics  >  Test: Three Phase 180 Degree Mode VSI - Electrical Engineering (EE) MCQ

Test: Three Phase 180 Degree Mode VSI - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test Power Electronics - Test: Three Phase 180 Degree Mode VSI

Test: Three Phase 180 Degree Mode VSI for Electrical Engineering (EE) 2024 is part of Power Electronics preparation. The Test: Three Phase 180 Degree Mode VSI questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Three Phase 180 Degree Mode VSI MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Three Phase 180 Degree Mode VSI below.
Solutions of Test: Three Phase 180 Degree Mode VSI questions in English are available as part of our Power Electronics for Electrical Engineering (EE) & Test: Three Phase 180 Degree Mode VSI solutions in Hindi for Power Electronics course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: Three Phase 180 Degree Mode VSI | 10 questions in 30 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study Power Electronics for Electrical Engineering (EE) Exam | Download free PDF with solutions
Test: Three Phase 180 Degree Mode VSI - Question 1
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In a 3 – ϕ inverter circuit shown, the load is balanced and gating scheme is 180° conduction mode. All the switching devices are ideal

If the dc bus voltage Vd = 300V, the power consumed by 3 – ϕ load is

Detailed Solution for Test: Three Phase 180 Degree Mode VSI - Question 1



Test: Three Phase 180 Degree Mode VSI - Question 2
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A three phase bridge inverter is fed from a 500 V dc source. The inverter is operated in 180° conduction mode and it is supplying a purely resistive, star – connected load. The RMS value of the output (line) voltage is

Detailed Solution for Test: Three Phase 180 Degree Mode VSI - Question 2

Concept:

Calculation:

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*Answer can only contain numeric values
Test: Three Phase 180 Degree Mode VSI - Question 3
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A 3-ϕ 180° mode bridge inverter has star connected load of R = 4 Ω and L = 25 mH. The inverter is feed from 220 V dc and its output frequency is 50 Hz. Find the fundamental component of line voltage.


Detailed Solution for Test: Three Phase 180 Degree Mode VSI - Question 3

Concept:

The Fourier analysis of phase voltage

Where K = 0, 1, 2…

∴ Fundamental component of phase voltage

Fundamentals component of line voltage

Calculation:

Test: Three Phase 180 Degree Mode VSI - Question 4
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A 3 - ϕ voltage source inverter is operated in 180° conduction mode. Which one of the following statements is true?
Detailed Solution for Test: Three Phase 180 Degree Mode VSI - Question 4

Line voltage is given by

A three phase voltage source inverter is operated in 180° mode. In that case third harmonics are absent in line voltage due to the factor 

Where k = 0, 1 ,2,....

For n = 3, Vp ≠ 0

∴ Vp is not free from third harmonics

Hence pole voltage will have 3rd harmonic component but line voltage will be free from 3rd harmonic.

Test: Three Phase 180 Degree Mode VSI - Question 5
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A three-phase voltage source inverter with ideal devices operating in 180° conduction mode is feeding a balanced star-connected resistive load. The DC voltage input is Vdc. The peak of the fundamental component of the phase voltage is
Detailed Solution for Test: Three Phase 180 Degree Mode VSI - Question 5

Concept:

Calculation:

The waveform of output voltage in a three-phase voltage source inverter operating in 180° conduction mode is shown below.

Fourier series expansion of line to neutral voltage is

Test: Three Phase 180 Degree Mode VSI - Question 6
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A 3-phase inverter delivers power to a resistive load from a DC source 'Vs'. For a star-connected load of 'R' Ω per phase, the load power for 180 degree mode of operation is _______.
Detailed Solution for Test: Three Phase 180 Degree Mode VSI - Question 6

Concept:

In 180° conduction mode:

Calculation:

For a star-connected load of 'R' Ω per phase, the load power for the 180-degree mode of operation is

Test: Three Phase 180 Degree Mode VSI - Question 7
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In a 3-phase inverter with 180° conduction mode the number of switches that is on at any instant of time is
Detailed Solution for Test: Three Phase 180 Degree Mode VSI - Question 7

180-degree conduction with star connected resistive load:

The configuration of the three-phase inverter with star connected resistive load as shown in the figure. The following convention is followed.

  • A current leaving a node point a, b or c and entering the neutral point n is assumed to be positive.
  • All the three resistances are equal, Ra = Rb = Rc = R

In this mode of operation, each switch conducts for 180°. Hence at any instant of time three switches remain on. There are six possible modes of operation in a cycle and each mode is of 60° duration and the explanation of each mode is as follows:

Test: Three Phase 180 Degree Mode VSI - Question 8
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For the waveform (as shown below), which of the options is true?
Detailed Solution for Test: Three Phase 180 Degree Mode VSI - Question 8

For 180° conduction mode:

  • Line voltage remains Vdc for 120°
  • Phase voltage remains  for each 60°

For 120° conduction mode:

  • Phase voltage remains  for 120°
  • Line voltage remains  for 60° 


Hence, the given waveform represents the load phase voltage when the inverter is operating in 180° conduction mode.

*Answer can only contain numeric values
Test: Three Phase 180 Degree Mode VSI - Question 9
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A three-phase Voltage Source Inverter (VSI) as shown in the figure is feeding a delta connected resistive load of 30Ω/phase. If it is fed from a 600V battery, with 180° conduction of solid-state devices, the power consumed by the load, in kW, is __________.

Detailed Solution for Test: Three Phase 180 Degree Mode VSI - Question 9

Concept:

Calculation:

A three phase voltage source inverter supplying equivalent delta load.

Equivalent star load resistance is,

Test: Three Phase 180 Degree Mode VSI - Question 10
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A d.c. source is switched in steps to synthesize the three-phase output. The basic three-phase bridge inverter can be controlled. The angle through which each switch conducts, and any instant the number of switches conducting simultaneously are, respectively
Detailed Solution for Test: Three Phase 180 Degree Mode VSI - Question 10

In a three-phase bridge inverter,

For 120° mode conduction, no of switches conducting simultaneously = 2

For 180° mode conduction, no of switches conducting simultaneously = 3

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