This question was asked inSupervisor Instructor Electrical Part B Technical Paper 2026Question 116 of 120 published · Gujarat Subordinate Service Selection BoardOpen paper
Q116EasyAnalog Instruments

What type of coil is used in moving-iron instruments?

Answer & step-by-step solution
Correct answer: C. Stationary coil with many turns
Quick explanation

C — A stationary coil with many turns. The measured current flows through this fixed multi-turn coil and creates the magnetic field that acts on the soft-iron vane.

Detailed solution (in the paper’s original language)

સમજૂતી

Moving-iron instrument માં measured current fixed multi-turn coilમાંથી વહે છે અને magnetic field બનાવે છે.

આ field માં soft-iron element move થાય છે અને pointer deflection ઉત્પન્ન કરે છે. Coil પોતે stationary રહે છે.

મુખ્ય ખ્યાલ

Moving-iron એટલે iron move થાય છે; current-carrying coil stationary રહે છે.

સૂત્ર

Moving-iron instrument માં Td ∝ I².

પરીક્ષા મુદ્દો

Fixed coil અને તેમાં move થતું soft-iron piece visualize કરો.

ઝડપી ટ્રિક

Moving IRON નો અર્થ moving COIL નથી.

બીજા વિકલ્પો ખોટા કેમ છે

Moving coil PMMC-type instrument ની રચના છે; moving-iron instrument ની નહીં.

સામાન્ય ભૂલ

MI અને PMMC construction ને ગૂંચવવું.

Solution diagram – What type of coil is used in moving-iron instruments?
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