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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Test: Power Electronics- 7 - Electrical Engineering (EE) MCQ

Test: Power Electronics- 7 - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Power Electronics- 7

Test: Power Electronics- 7 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Power Electronics- 7 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Power Electronics- 7 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Power Electronics- 7 below.
Solutions of Test: Power Electronics- 7 questions in English are available as part of our course for Electrical Engineering (EE) & Test: Power Electronics- 7 solutions in Hindi for Electrical Engineering (EE) course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: Power Electronics- 7 | 10 questions in 30 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study for Electrical Engineering (EE) Exam | Download free PDF with solutions
Test: Power Electronics- 7 - Question 1
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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: Power Electronics- 7 - Question 1


= 0.816 × 500 = 408 V

Test: Power Electronics- 7 - Question 2
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In a three phase voltage source inverter operating in square wave mode, the output line voltage is free from

Detailed Solution for Test: Power Electronics- 7 - Question 2

The rms nth component of the line voltage is 
 

where Vdc is the input source voltage for n = 3, line voltage

Third harmonic component would not appear in the output

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*Answer can only contain numeric values
Test: Power Electronics- 7 - Question 3
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In single pulse modulation of PWM inverter, 3rd harmonic can be eliminated if pulse width is equal to______ (in degrees)


Detailed Solution for Test: Power Electronics- 7 - Question 3

Pulse width for eliminating

nth harmonic 

*Answer can only contain numeric values
Test: Power Electronics- 7 - Question 4
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A three – phase bridge inverter delivers power to a resistive load from a 450 V dc source. for a star connected load if 10Ω per phase. What is the load power for 180° conduction mode ______________ (in kW)

Detailed Solution for Test: Power Electronics- 7 - Question 4

Test: Power Electronics- 7 - Question 5
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A 3 ϕ bridge inverter delivers power to a resistive load from a 400 V dc. For a star – connected load of 15 Ω per phase, determine load power and R.M.S value of thyristor current for 120° mode
Detailed Solution for Test: Power Electronics- 7 - Question 5


load power = 3I2or R = 3 × (10.87)2 × 15 = 5.317kW

*Answer can only contain numeric values
Test: Power Electronics- 7 - Question 6
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A 3 phase MOSFET inverter is connected between a balanced star connected resistive load with RL = 10 Ω and a 250 V dc supply. The inverter frequency is set at 33 Hz, and the switches have 120° conduction periods. Calculate the load power _______ (in kW)

Detailed Solution for Test: Power Electronics- 7 - Question 6


= 3.13 kW

*Answer can only contain numeric values
Test: Power Electronics- 7 - Question 7
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for a single pulse – width modulation of a single phase inverter, The distortion factor for pulse width of π/2 is ___________

Detailed Solution for Test: Power Electronics- 7 - Question 7

given, 2d = π/2

single pulse modulation output for pulse width 2d = π/2 is shown below.

from Fourier series, fundamental output voltage is

from output voltage wave form

Test: Power Electronics- 7 - Question 8
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For a load of R = 10 Ω and L = 0.03 H, Find the RMS value of the fundamental component of inverter output current in case inverter of part Quasi-square output with 120° pulse width. The source voltage is 230 V and frequency 50 Hz
Detailed Solution for Test: Power Electronics- 7 - Question 8

Concept:

The output voltage is controlled by varying the pulse-width 2d. This shape of the output voltage is called Quasi-square wave.

Fourier series of this wave from is

Fundamental component of output voltage

Calculation:
Load impedance at Fundamental Frequency is

For Quasi-square wave or single-pulse modulated wave where pulse width, 2d = 120° or d = 60°

∴ R.M.S value of fundamental current

*Answer can only contain numeric values
Test: Power Electronics- 7 - Question 9
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The inverter is operated at 50 Hz. In 180° square wave mode. Find the peak to peak inductor i0 in the circuit shown in figure.

Detailed Solution for Test: Power Electronics- 7 - Question 9


at, t = 0, i0 = -ip and t = t1, i0 = ip

*Answer can only contain numeric values
Test: Power Electronics- 7 - Question 10
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For the symmetrical two pulse modulation with pulse width 36°. Find the percentage of 3rd harmonic in the output voltage  is_______

Detailed Solution for Test: Power Electronics- 7 - Question 10

Concept:

In multiphase pulse modulation, several equidistant pulses per half cycle are used.

Fourier series of multiple pulse modulation is

N = pulse per half cycle

Calculation:

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