1
GATE EE 2006
+1
-0.3
A sampling wattmeter (that computes power from simultaneously sampled values of voltage and current) is used to measure the average power of a load. The peak to peak voltage of the square wave is $$10V$$ and the current is triangular wave of $$5A$$ $$p$$-$$p$$ as shown in the figure. The period is $$20$$$$ms$$. The reading in $$W$$ will be
A
$$0W$$
B
$$25W$$
C
$$50W$$
D
$$100W$$
2
GATE EE 2004
+1
-0.3
The circuit in fig is used to measure the power consumed by the load. The current coil and the voltage coil of the watt meter have $$0.02$$ $$\Omega$$ and $$1000$$ $$\Omega$$ resistance respectively. The measured power compared to the load power will be
A
$$0.4\%$$ less
B
$$0.2\%$$ less
C
$$0.2\%$$ more
D
$$0.4\%$$ more
3
GATE EE 2002
+1
-0.3
The line to line input voltage to the $$3$$ phase, $$50$$ Hz, ac circuit shown in fig is $$100$$ $$V$$ $$r.m.s$$ Assuming that the phase sequence is $$RYB$$ the wattmeter would read.
A
$${W_1} = 886\,W\,\,\,$$ and $$\,\,\,{W_2} = 896\,W$$
B
$${W_1} = 500\,W\,\,\,$$ and $$\,\,\,{W_2} = 500\,W$$
C
$${W_1} = 0\,W\,\,\,$$ and $$\,\,\,{W_2} = 1000\,W$$
D
$${W_1} = 250\,W\,\,\,$$ and $$\,\,\,{W_2} = 750\,W$$
4
GATE EE 2001
+1
-0.3
The minimum number of wattmeter(s) required to measure 3 $$-$$ phase, 3 $$-$$ wire balanced or unbalanced power is
A
1
B
2
C
3
D
4
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