Test: Three Phase Bridge Inverter

# Test: Three Phase Bridge Inverter

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## 10 Questions MCQ Test Power Electronics | Test: Three Phase Bridge Inverter

Test: Three Phase Bridge Inverter for Electrical Engineering (EE) 2023 is part of Power Electronics preparation. The Test: Three Phase Bridge Inverter questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Three Phase Bridge Inverter MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Three Phase Bridge Inverter below.
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Test: Three Phase Bridge Inverter - Question 1

### Identify the below given circuit. Detailed Solution for Test: Three Phase Bridge Inverter - Question 1

It is a three-phase bridge type inverter. As SCRs are used as the switching device, it is called as a thyristor inverter.

Test: Three Phase Bridge Inverter - Question 2

### The below given inverter circuit is a __ step inverter. Detailed Solution for Test: Three Phase Bridge Inverter - Question 2

The three-phase bridge type is a 6-step inverter. That means, the firing changes from one SCR to another 6 times per cycle.

Test: Three Phase Bridge Inverter - Question 3

### In inverters, to make the supply voltage constant

Detailed Solution for Test: Three Phase Bridge Inverter - Question 3

A large C connected across the input terminal keep the supply voltage from altering.

Test: Three Phase Bridge Inverter - Question 4

In the figure given below, for 180° mode of operation if T1 is fired at 0°. Then SCRs T3 and T5 should be fired at _________ and _________ respectively.

Detailed Solution for Test: Three Phase Bridge Inverter - Question 4

T1-T4 form the first pair. T3-T6 form the second pair, and like-wise. For the 180° mode, each SCR conducts for 180°, but the groups of SCRs lag the prior group by an angle of 120°. e.g. If T1 is fired at 0 then T3 must be fired at an angle of 0 + 120° and T5 at 120 + 120 = 240°.

Test: Three Phase Bridge Inverter - Question 5

_________ SCRs conduct from 300° to 360°. Detailed Solution for Test: Three Phase Bridge Inverter - Question 5 Each step consists of 60°. 300° to 360° will be step VI.

Test: Three Phase Bridge Inverter - Question 6

A three-phase bridge inverter requires minimum of _______ switching devices.

Detailed Solution for Test: Three Phase Bridge Inverter - Question 6

It requires a min. 6 devices, 2 in each leg. Switching devices could be anything BJT, MOSFET or an IGBT. SCRs are used when very high power ratings are required.

Test: Three Phase Bridge Inverter - Question 7

In the three-phase bridge inverter, each step consists of

Detailed Solution for Test: Three Phase Bridge Inverter - Question 7

It is a 6 step inverter. Hence, 360/6 = 60°. This means that the SCRs are gated every 60° in proper sequence.

Test: Three Phase Bridge Inverter - Question 8

In the 180° mode VSI, ___________ devices conduct at a time.

Detailed Solution for Test: Three Phase Bridge Inverter - Question 8

Three devices conduct at a time. One from the upper pair and two from the lower pair or vice-versa.

Test: Three Phase Bridge Inverter - Question 9

For a three phase bridge inverter in the 180° mode, ___________ devices are conducting from 120° to 180°. Detailed Solution for Test: Three Phase Bridge Inverter - Question 9 Each step consists of 60°. 120° to 180° will be step III.

Test: Three Phase Bridge Inverter - Question 10

The diodes D4 and D1 will conduct from Detailed Solution for Test: Three Phase Bridge Inverter - Question 10

This will depend on the nature on the load, which is not mentioned in the above problem.

## Power Electronics

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## Power Electronics

5 videos|39 docs|63 tests