1
GATE EE 2002
+2
-0.6
In the circuit shown in Fig. what value of $$C$$ will cause a unity power factor at the $$ac$$ source?
A
$$68.1\,\,\mu F$$
B
$$165\,\,\mu F$$
C
$$0.681\,\,\mu F$$
D
$$6.81\,\,\mu F$$
2
GATE EE 2002
+2
-0.6
A series $$R-L-C$$ circuit has $$R = 50\Omega ;$$ $$L=100$$ $$\mu H$$ and $$C = 1\,\,\mu F.$$ The lower half power frequency of the circuit is
A
$$30.55$$ $$kHz$$
B
$$3.055$$ $$kHz$$
C
$$51.92$$ $$kHz$$
D
$$1.92$$ $$kHz$$
3
GATE EE 2002
+2
-0.6
A first order, low pass filter is given with $$R = 50\,\,\Omega$$ and $$C$$ $$= 5\mu F.$$ What is the frequency at which the gain of the voltage transfer function of the filter is $$0.25?$$
A
$$4.92$$ $$kHz$$
B
$$0.49$$ $$kHz$$
C
$$2.46$$ $$kHz$$
D
$$24.6$$ $$kHz$$
4
GATE EE 2002
+2
-0.6
In the circuit shown in Fig. it is found that the input $$ac$$ voltage $$\left( {{V_i}} \right)$$ and current $$i$$ are in phase. The coupling coefficient is $$K = {M \over {\sqrt {{L_1}{L_2}} }},$$ where $$M$$ is the mutual inductance between the two coils. The value of $$K$$ and the dot polarity of the coil $$P-Q$$ are
A
$$K = 0.25$$ and dot at $$P$$
B
$$K = 0.5$$ and dot at $$P$$
C
$$K = 0.25$$ and dot at $$Q$$
D
$$K = 0.5$$ and dot at $$Q$$
EXAM MAP
Medical
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