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

Test: Three Phase 180 Degree Mode VSI for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) 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.
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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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