1
GATE EE 2000
MCQ (Single Correct Answer)
+2
-0.6
A two-port device is defined by the following pair of equations:
$${i_1} = 2{v_1} + {v_2}$$ and $${i_2} = {v_1} + {v_2}$$
Its impedance parameters $$\left( {{z_{11}},\,\,{z_{12}},\,\,{z_{21}},\,\,{z_{22}}} \right)$$ are given by
A
$$\left( {2,\,\,1,\,\,1,\,\,1} \right)$$
B
$$\left( {1,\,\, - 1,\,\, - 1,\,\,2} \right)$$
C
$$\left( {1,\,\,1,\,\,1,\,\,2} \right)$$
D
$$\left( {2,\,\, - 1,\,\, - 1,\,\,1} \right)$$
2
GATE EE 2000
MCQ (Single Correct Answer)
+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 2000
Subjective
+5
-0
A $$3$$ - $$\phi $$ load operates with balanced voltages applied to its terminals, and draws balanced currents. The potential coil of a moving coil wattmeter is connected from $$R$$ to $$Y$$ terminals of the load. The current coil of the meter is connected in series with phase $$B.$$ by appropriate derivation, show that the quantity indicated by this wattmeter is proportional to the reactive power drawn by the load
4
GATE EE 2000
MCQ (Single Correct Answer)
+1
-0.3
Instrument transformers are known to introduce magnitude and phase errors in measurements. These are primarily due to
A
improper connections on the primary side
B
measurement errors inherent in the meter connected to the transformer secondary
C
open and short circuit parameters of the instrument transformers
D
none
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