1
GATE EE 2017 Set 1
+1
-0.3
A source is supplying a load through a 2-phase, 3-wire transmission system as shown in figure below. The instantaneous voltage and current in phase-a are $$v_{an}=220\sin\left(100\mathrm{πt}\right)\;V$$ and $$i_a=10\sin\left(100\mathrm{πt}\right)\;A$$, respectively. Similarly for phase-b the instantaneous voltage and current are $$v_{bn}=220\cos\left(100\mathrm{πt}\right)\;V$$ and $$i_b=10\cos\left(100\mathrm{πt}\right)\;A$$, respectively. The total instantaneous power flowing form the source to the load is
A
2200 W
B
$$2200\;\sin^2\left(100\mathrm{πt}\right)\;W$$
C
4400 W
D
$$2200\;\sin\left(100\mathrm{πt}\right)\cos\left(100\mathrm{πt}\right)\;W$$
2
GATE EE 2014 Set 3
+1
-0.3
In a long transmission line with $$r, l, g$$ and $$𝑐$$ are the resistance, inductance, shunt conductance and capacitance per unit length respectively, the condition for distortionless transmission is
A
$$rc = \ell g$$
B
$$r = \ell /r$$
C
$$rg = \ell c$$
D
$$g = \sqrt {c/\ell }$$
3
GATE EE 2014 Set 2
Numerical
+1
-0
A single phase induction motor draws $$12MW$$ power at $$0.6$$ lagging power. A capacitor is connected in parallel to the motor to improve the power factor of the combination of motor and capacitor to $$0.8$$ lagging. Assuming that the real and reactive power drawn by the motor remains same as before, the reactive power delivered by the capacitor in MVAR is _______ .
4
GATE EE 2014 Set 1
+1
-0.3
The undesirable property of an electrical insulating material is
A
high dielectric strength
B
high relative permittivity
C
high thermal conductivity
D
high insulation resistivity
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