Questions – Answers

Electrical and Electronics Engineering Interview Questions and Answers

Why Power in Pure Inductive and Pure Capacitive Circuit is Zero?

Why Power is Zero (0) in Pure Inductive, Pure Capacitive or a Circuit in which Current and Voltage are 90° Out of Phase? These types of questions are asked in…
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Why Flux in Primary and Secondary Winding is Always Equal?

Why Flux in the Primary and Secondary Winding of the Transformer is Same? One of our followers asked “In a transformer, Which one is greater? primary flux or secondary flux?…
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Can We Replace a 110/220 Turns Transformer with 10/20 Turns?

1:2 Turn Ratio for 110:220? The Turn Ratio is Same, Shall its Rating be Same? A step up transformer which has 110/220 turns. Can we replace it with 10/20 turns…
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Is it Possible to Operate a 50Hz Transformer on 5Hz or 500Hz Frequency?

What Happens if a 50Hz Transformer is Connected to 5Hz or 500Hz Supply Frequency? What would happen if a power transformer designed for operation on 50Hz frequency were connected to…
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Which Transformer is More Efficient When Operates on 50Hz or 60Hz?

A 50/60 Hz Transformer – Which One is More Efficient and Why? A transformer is designed to be operated on both 50Hz and 60Hz frequency. For the Same rating, which…
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Can We Operate a 60Hz Transformer on 50Hz Supply Source and Vice Versa?

What Happens When a 50Hz Transformer Operates on 60Hz and Vice Versa? Let’s suppose we have a transformer with same rating and parameters when operated at 60Hz and 50Hz supply…
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Is Lightning AC or DC ?

Is Lightning Alternating Current (AC) or Direct Current (DC)? Lightning is a transient impulse, meaning it’s neither purely AC nor DC, but rather a combination of both. In other words,…
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Why Can’t a Transformer Be Operated on DC Supply?

What Happens When the Primary of a Transformer is Connected to the DC Supply? A transformer is a device which step-up or step-down the level of AC current or voltage…
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What Happens When an AC Line Touches a DC Line?

What Happens When DC Equipment are Operated on AC Voltage and Vice Versa ? AC and DC Mixed Operated Devices There is no simple, one-word answer like ‘Yes’ or ‘No’…
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AC or DC – Which One is More Dangerous And Why ?

Which is More Dangerous – AC or DC? First of all, keep in mind that both AC and DC voltage and Current are dangerous and hazardous. Both are our friends…
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