Electrical Engineering - Inductors - Discussion

Discussion :: Inductors - General Questions (Q.No.8)

8. 

An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is

[A]. good
[B]. open
[C]. shorted
[D]. partly shorted

Answer: Option C

Explanation:

No answer description available for this question.

Satish Kumar said: (Jul 23, 2011)  
Ans:C.(shorted)
if the inductor is shorted, inductor will offers zero impedance to current hence the current will not pass through the ohmmeter which has a resistance in it.hence the pointer will not operate at that condition

Ashok &Amp; Balaji said: (Jan 9, 2012)  
If the inductor is shorted, inductor will offers zero impedance to current hence the current will not pass through the ohmmeter which has a resistance in it. Hence the pointer will not operate at that condition.

Rajesh Veerla said: (Jun 14, 2013)  
When it is opened what happend?

Vikram said: (Aug 20, 2013)  
If the inductor is shorted, inductor will offers zero impedance to current hence the current will not pass through the ohmmeter which has a resistance in it. Hence the pointer will not operate at that condition.

Anthony said: (Feb 27, 2014)  
If the inductor is in good condition, what would the ohmmeter indicate?

Prashant Singh said: (Mar 5, 2014)  
Of course ohmeter read zero. But it is impossible as every conductor has resistance. So we could say it is ideal inductor.

Akhilesh said: (Jun 7, 2014)  
If inductor is ideal ohm meter indicate zero reading. Or inductor is shorted.

Srengineer said: (Oct 8, 2014)  
An ohmmeter measures resistance, not impedance. An inductor is just a length of wire wound around a coil. At DC the resistance will be zero for an ideal inductor or very low for a real inductor. So you can't tell if this is a short or a high-q inductor. Suppose I measure a wire that is 1 foot long and it measures zero Ohms. Then I make 1 turn to make and inductor. The ohmmeter will still measure the same. So you can't tell if it is a good inductor or shorted one.

This statement from @Humar above is entirely wrong:

"If the inductor is shorted, inductor will offers zero impedance to current hence the current will not pass through the ohmmeter which has a resistance in it. Hence the pointer will not operate at that condition".

The truth is this:

If the inductor is shorted, inductor will offer zero impedance to current hence AS MUCH CURRENT AS POSSIBLE will flow through the ohmmeter, indicating the that the resistance is zero.

Zero impedance means maximum current not minimum current.

Raj said: (Dec 7, 2014)  
Impedance inductor inductance reactance different please.

Harish said: (Dec 7, 2014)  
When it is open condition it shows infinity. If it is showing zero means motor is bad condition.

Girisha P N said: (May 19, 2015)  
Its simple question. When the pointer inducts 0 means the current goes to infinite value its happens only when the circuit s shorted (rejection of load and its shorted).

Venkatesh R said: (Jun 15, 2015)  
To the best of my knowledge. It analog meter it the inductor reads short its good one not shorted. If you read in digital meter you can see 5 to 10 ohms.

So the correct answer is inductor is good one.

Ankur said: (Jul 3, 2015)  
Here no mentioned the inductor is ideal or not. So we have to consider its practical aspects. So answer is (C) shorted.

Svn said: (Aug 5, 2015)  
Reads zero then shorted, reads infinity then open.

Sunil Kumar said: (Sep 12, 2015)  
Ohmmeter reads resistance not impedance if there is no resistance then it must be a good inductor. So I think both (A) and (C) are correct.

But if we have to choose only one then (C) is better one.

Umar Haruna Itopa said: (Oct 19, 2016)  
Zero reading of the ohmmeter indicates short circuits inductor.

Harsha said: (Mar 12, 2017)  
Doesn't the inductor restricts change in currents?

Prasad Hajare said: (Sep 7, 2017)  
Reading is zero, so it will acts as short circuit.

D Shwetha said: (Sep 8, 2018)  
If short circuit occure - 0 reading shows.

If open circuit - infinite value shows.

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