1
GATE EE 2005
+2
-0.6
The $$RL$$ circuit of the figure is fed from a constant magnitude, variable frequency sinusoidal voltage source $${V_{IN.}}$$ At $$100Hz,$$ the $$R$$ and $$L$$ elements each have a voltage drop $${u_{RMS}}.$$ If the frequency of the source is changed to $$50Hz,$$ then new voltage drop across $$R$$ is
A
$$\sqrt {{5 \over 8}} \,\,{u_{RMS}}$$
B
$$\sqrt {{2 \over 3}} \,\,{u_{RMS}}$$
C
$$\sqrt {{8 \over 5}} \,\,{u_{RMS}}$$
D
$$\sqrt {{3 \over 2}} \,\,{u_{RMS}}$$
2
GATE EE 2004
+2
-0.6
In Fig. the admittance values of the elements in Siemens are
$${Y_R} = 0.5 + j0,$$
$${Y_L} = 0 - j\,1.5,$$
$${Y_C} = 0 + j\,0.3$$ respectively.
The value of $${\rm I}$$ as a phasor when the voltage $$E$$ across the elements is $$10\angle {0^0}\,V$$ is
A
$$1.5 + j\,0.5$$
B
$$5 - j\,18$$
C
$$0.5 + j\,1.8$$
D
$$5 - j\,12$$
3
GATE EE 2003
+2
-0.6
In the circuit of Fig. the magnitudes of $${V_L}$$ and $${V_C}$$ are twice that of $${V_R}$$. The inductance of the coil is
A
$$2.14$$ $$mH$$
B
$$5.30$$ $$H$$
C
$$3.18$$ $$mH$$
D
$$1.32$$ $$H$$
4
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
$$6.81\,\,\mu F$$
EXAM MAP
Medical
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