This question was asked inSupervisor Instructor Electrical Part B Technical Paper 2026Question 106 of 120 published · Gujarat Subordinate Service Selection BoardOpen paper
Q106HardRectifiers & Converters

In a single-phase full-wave fully controlled bridge converter with continuous load current, what is the effect on the conduction period of each thyristor as the firing angle increases?

Answer & step-by-step solution
Correct answer: D. The conduction period of each thyristor remains unchanged.
Quick explanation

D — Remains unchanged. With continuous current each thyristor pair conducts for 180° until the next pair is fired; changing α only shifts the conduction interval, not its length.

Detailed solution (in the paper’s original language)

સમજૂતી

Continuous load current હોય ત્યારે conducting thyristor pair ને next firing instant પર આગળનું pair replace કરે છે.

તેથી દરેક thyristor 180 electrical degrees (π radians) સુધી conduct કરે છે. Firing angle વધે તો conduction interval shift થાય છે, પરંતુ તેની duration બદલાતી નથી.

મુખ્ય ખ્યાલ

Continuous current → દરેક thyristor નું conduction period 180°.

સૂત્ર

Conduction period = π rad = 180°.

પરીક્ષા મુદ્દો

'Continuous load current' શબ્દ ખાસ ધ્યાનથી વાંચો.

ઝડપી ટ્રિક

α interval ને shift કરે છે; 180° duration ને shorten કરતું નથી.

બીજા વિકલ્પો ખોટા કેમ છે

Zero/decrease/increase duration continuous-current bridge commutation sequence સાથે મેળ ખાતું નથી.

સામાન્ય ભૂલ

Firing angle મોટો એટલે conduction duration નાનું જ થાય એવું માનવું.

Solution diagram – In a single-phase full-wave fully controlled bridge converter with continuous…
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