Electronics and Communication Engineering - Measurements and Instrumentation - Discussion
Discussion Forum : Measurements and Instrumentation - Section 1 (Q.No. 3)
3.
The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be
Answer: Option
Explanation:
Discussion:
30 comments Page 3 of 3.
Deepshikha said:
9 years ago
Why not considered the 2000 ohm resistance for dc current?
Sneha.v.k said:
8 years ago
V/(R+jXl).
250/(2500+j (2πfl)).
250/(2500+j 314.159).
250/(2500+j (2πfl)).
250/(2500+j 314.159).
Pipo said:
9 years ago
Find first fall Idc.
Find Iac.
Reading = iac/idc * 250.
Find Iac.
Reading = iac/idc * 250.
Avinash said:
7 years ago
Here, We need to find the Impedance. X=πr^2+XL^2.
Skm said:
8 years ago
How we calculate i taking j?
Please help me.
Please help me.
Lou said:
9 years ago
It should be 250/(2500+j314) to get 0.09922.
Annu kumari said:
1 decade ago
From where you put the value of j314.16?
Cheetha said:
1 decade ago
Inductive reactance = 2*pi*f*L.
Prabhas said:
9 years ago
The value of φ = (22/7).
Rakesh said:
5 years ago
Clearly explained.
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