1
GATE EE 1998
+1
-0.3
A circuit with a resistor, inductor and capacitor in series is resonant at $${f_0}\,\,Hz.$$ If all the component values are now doubled, the new resonant frequency is
A
$$2\,\,{f_0}$$
B
still $${f_0}$$
C
$${f_0}/4$$
D
$${f_0}/2$$
2
GATE EE 1998
Subjective
+5
-0
A circuit consisting of a single resistor $$R$$ and an inductor $$L$$ in series is driven by a $$25$$ $$V$$ $$rms,$$ $$50$$ $$Hz$$ sinusoidal voltage source. A capacitor is to be placed in parallel with the source to improve the power factor. Given that the average power dissipated in the $$R$$ is $$100$$ $$W$$ and that the reactive power delivered to the $$L$$ is $$75$$ $$VAR,$$ what value of $$C$$ will yield a $$0.9$$ $$p.f.$$ lagging as seen by the source?
3
GATE EE 1998
Subjective
+5
-0
Determine the impedance seen by the source $${V_s} = 24\angle {0^0}$$ in the network shown in Fig.
4
GATE EE 1998
+1
-0.3
A d.c. voltmeter has a sensitivity of $$1000$$$$\Omega /volt.$$ When it measures half full scale in $$100$$ $$V$$ range, the current through the voltmeter is
A
$$100$$ $$mA$$
B
$$1$$ $$mA$$
C
$$0.5$$ $$mA$$
D
$$50$$ $$mA$$
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