Electrical Quiz

02/09/2025

Book with Breakfast

25/12/2024

07/09/2024

خاموشی سے محنت کریں اور اپنی کامیابی کو شور مچانے دیں۔

30/08/2023

Onam 2023 സന്തോഷത്തിൻ്റെ സമൃദ്ധിയുടെയും ഈ ഓണക്കാലത്ത് ഏവർക്കും ഹൃദയം നിറഞ്ഞ ഓണാശംസകൾ.

23/10/2022

Sunset Point

29/04/2022

“You know you’re getting old when you stoop to tie your shoelaces and wonder what else you could do while you’re down there.”

08/11/2020

12/10/2020

The Wheatstone bridge is used to measure

(A) Low value of current

(B) High value of current

(C) High value of voltage

(D) Resistance value

12/10/2020

A watt meter can be connected to a high current circuit by using

(A) Eddy current transformer

(B) Potential transformer

(C) Current transformer

(D) Shunt

12/10/2020

The insulation resistance of cables, transformers etc is measured by following instrument

(A) Wheatstone bridge

(B) Kelvin bridge

(C) Meggar

(D) Decade box

12/10/2020

How Tube Light works:

1. When power is applied to a tube light circuit, this voltage is not sufficient to ionize the gas inside the main tube.

2.However, this power generates an electric potential across the contacts of small tube of starter.

3.This electric field is large enough to ionize the gas inside the small tube and hence a current flow in the two contacts through the ionized gas.

4.The heat generated due to the flow of current expands the bi-metallic plate towards the other plate and within a few tenths of seconds, it touches the other plate. During the short the voltage falls to zero. The bimetallic strip cools and pops back open, opening the circuit. In the ballast the transformer had a magnetic field, when the circuit is cut the magnetic field collapses and forms an 'inductive kick' from the ballast. Suddenly this kick of high voltage is sent through the lamp and this starts the arc. If it didn't work, if the lamp is still too cold, then the starter switch will light again and repeat the process.

Now the gas of the main tube gets ionized and current starts flowing through it. Thus the bi-metallic plate of starter cools down re-opening the gap between the two contacts. This gap will remain open until the tube light will start next time.

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