1
GATE EE 2003
+2
-0.6
A wattmeter reads $$400$$ $$W$$ when its current coil is connected in the $$R$$ phase and its pressure coil is connected between this phase and the neutral of a symmetrical $$3$$-phase system supplying a balanced star connected $$0.8$$ $$p.f.$$ inductive load. The phase sequence is $$RYB.$$ What will be the reading of this wattmeter if its pressure coil alone is reconnected between the $$B$$ and $$Y$$ phases, all other connections remaining as before?
A
$$400.0$$
B
$$519.6$$
C
$$300.0$$
D
$$692.8$$
2
GATE EE 2000
+2
-0.6
The two wattmeter method is used to measure active power on a three phase, three wire system. If the phase voltage is unbalanced, then the power reading is
A
affected by both negative sequence and zero sequence voltages
B
affected by negative sequence voltages but not by zero sequence voltages
C
affected by zero sequence voltages but not by negative sequence voltages
D
not affected by negative or zero sequence voltages
3
GATE EE 1999
+2
-0.6
The voltage phasor of a circuit is $$10\angle {15^ \circ }V$$ and the current phasor is $$2\angle - {45^ \circ }A.$$ The active and the reactive powers in the circuit are
A
$$10$$ $$W$$ and $$17.32$$ $$V$$ Ar.
B
$$5$$ $$W$$ and $$8.66$$ $$V$$ Ar.
C
$$20$$ $$W$$ and $$60$$ $$V$$ Ar.
D
$$20\sqrt 2$$ and $$10\sqrt 2 V$$ Ar.
4
GATE EE 1997
Fill in the Blanks
+2
-0
For the circuit shown in Fig, the wattmeter reading will be .... W and the power dissipted in the load is ......W
EXAM MAP
Medical
NEET