1
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
A $$200/1$$ current transformer $$(CT)$$ is wound with $$200$$ turns on the secondary on a toroidal core. When it carries a current of $$160$$ $$A$$ on the primary, the ratio and phase errors of the $$CT$$ are found to be $$-$$ $$50$$% and $$30$$ minutes respectively. If the number of secondary turns is reduced by $$1$$ the new ratio error (%) and phase error (min) will be respectively.
A
$$0.0, 30$$
B
$$-0.5, 35$$
C
$$-1.0, 30$$
D
$$-1.0, 25$$
2
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A $$50$$ $$Hz,$$ bar primary $$CT$$ has a secondary with $$500$$ turns. The secondary supplies $$5A$$ current into a purely resistive burden of $$1\,\Omega $$. The magnetizing ampere-turns is $$200$$. The phase angle between the primary and secondary current is
A
$${4.6^0}$$
B
$${85.4^0}$$
C
$${94.6^0}$$
D
$${175.4^0}$$
3
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
The core flux in the $$CT$$ of above problem under the given operating condition is
A
$$0$$
B
$$45.0\,\mu \,$$Wb
C
$$22.5$$ mWb
D
$$100.0$$ mWb.
4
GATE EE 2003
MCQ (Single Correct Answer)
+2
-0.6
A $$500$$ $$A/5$$ $$A,$$ $$50$$ $$Hz$$ current transformer has a bar primary. The secondary burden is a pure resistance of $$1\,\Omega $$ and it draws a current of $$5A$$. If the magnetic core requires $$250$$ AT for magnetization, the percentage ratio error is
A
$$10.56$$
B
$$-10.56$$
C
$$11.80$$
D
$$-11.80$$
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