Interconnecting Thyristors Questions and Answers
Power Electronics Objective Questions & Answers
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SCRs with a rating of 1000 V & 200 A are available to be used in a string to handle 6 KV & 1 KV. Calculate the number of series & parallel units required in case the derating factor is 0.1. (Round off the fraction to the greatest & nearest integer)
Correct!
Wrong!

The measure of reliability of string is given by the factor
Correct!
Wrong!

3 SCRs are connected in series. The string efficiency is 91%. SCRs 1, 2 & 3 have leakage currents 4 mA, 8 mA & 12 mA. Which SCR will block more voltage?
Correct!
Wrong!

When an extra SCR is connected in series with a string
Correct!
Wrong!

Two parallel connect SCRs have same voltage drop (Vt) having rated current = 2I1. SCR1 carries a current of I1=2.6 A whereas SCR2 carries a current of I2=1.4 A. Find the string efficiency.
Correct!
Wrong!

To have maximum possible string efficiency
Correct!
Wrong!

SCRs are connected in parallel to fulfill the ___________ demand
Correct!
Wrong!

The term used to measure the degree of utilization of SCRs connected in series & parallel is
Correct!
Wrong!

SCRs are connected in parallel to fulfill the ___________ demand
Correct!
Wrong!

To have maximum possible string efficiency
Correct!
Wrong!

The term used to measure the degree of utilization of SCRs connected in series & parallel is
Correct!
Wrong!

For a string voltage of 3300 V, let there be six series connected SCRs each of voltage 600V. Then the string efficiency is
Correct!
Wrong!

For a string voltage of 3300 V, let there be six series connected SCRs each of voltage 600V. Then the string efficiency is
Correct!
Wrong!

The most practical way of obtaining a uniform distribution of series connected SCRs is to
Correct!
Wrong!

The measure of reliability of string is given by the factor
Correct!
Wrong!

Two parallel connect SCRs have same voltage drop (Vt) having rated current = 2I1. SCR1 carries a current of I1=2.6 A whereas SCR2 carries a current of I2=1.4 A. Find the string efficiency.
Correct!
Wrong!

SCRs with a rating of 1000 V & 200 A are available to be used in a string to handle 6 KV & 1 KV. Calculate the number of series & parallel units required in case the derating factor is 0.1. (Round off the fraction to the greatest & nearest integer)
Correct!
Wrong!

The most practical way of obtaining a uniform distribution of series connected SCRs is to
Correct!
Wrong!

When an extra SCR is connected in series with a string
Correct!
Wrong!

3 SCRs are connected in series. The string efficiency is 91%. SCRs 1, 2 & 3 have leakage currents 4 mA, 8 mA & 12 mA. Which SCR will block more voltage?
Correct!
Wrong!
