1
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
A solar cell of $$350V$$ is feeding power to an $$ac$$ supply of $$440$$ $$V,$$ $$50$$ $$Hz$$ through a $$3$$- phase fully controlled briodge converter. A large inductance is connected in the $$dc$$ circuit to maintain the $$dc$$ current at $$20A.$$ If the solar cell resistance of $$0.5\Omega ,$$ then each thryristor will be reverse biased for a period of
A
$${125^ \circ }$$
B
$${120^ \circ }$$
C
$${60^ \circ }$$
D
$${55^ \circ }$$
2
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
A $$3$$ $$-$$ phase fully controlled bridge converter with free wheeling diode is fed from $$400$$ $$V$$, $$50$$ $$Hz$$ $$AC$$ source and is operating at a firing angle of $${60^ \circ }.$$ The load current is assumed constant at $$10A$$ due to high load inductance The input displacement factor $$(IDF)$$ and the input power factor $$(IPF)$$ of the converter will be
A
$$IDF=0.867:IPF=0.828$$
B
$$IDF=0.867:IPF=0.552$$
C
$$IDF=0.5:IPF=0.478$$
D
$$IDF=0.5:IPF=0.318$$
3
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
The Gauss Seidel load flow method has following disadvantages. Tick the incorrect student.
A
Unreliable convergence
B
Slow convergence
C
Choice of slack bus effects convergence
D
A good initial guess for voltages is essential for convergence
4
GATE EE 2006
MCQ (Single Correct Answer)
+1
-0.3
In a biased differential relay the bias is defined as a ratio of
A
Number of turns of restraining and operating coil
B
Operating coil current and restraining coil current
C
Fault current and operating coil current
D
Fault current and restraining coil current