1
AIEEE 2004
+4
-1
In a $$LCR$$ circuit capacitance is changed from $$C$$ to $$2$$ $$C$$. For the resonant frequency to remain unchaged, the inductance should be changed from $$L$$ to
A
$$L/2$$
B
$$2L$$
C
$$4L$$
D
$$L/4$$
2
AIEEE 2003
+4
-1
In an oscillating $$LC$$ circuit the maximum charge on the capacitor is $$Q$$. The charge on the capacitor when the energy is stored equally between the electric and magnetic field is
A
$${Q \over 2}$$
B
$${Q \over {\sqrt 3 }}$$
C
$${Q \over {\sqrt 2 }}$$
D
$$Q$$
3
AIEEE 2003
+4
-1
The core of any transformer is laminated so as to
A
reduce the energy loss due to eddy currents
B
make it light weight
C
make it robust and strong
D
increase the secondary voltage
4
AIEEE 2002
+4
-1
The power factor of $$AC$$ circuit having resistance $$(R)$$ and inductance $$(L)$$ connected in series and an angular velocity $$\omega$$ is
A
$$R/\omega L$$
B
$$R/{\left( {{R^2} + {\omega ^2}{L^2}} \right)^{1/2}}$$
C
$$\omega L/R$$
D
$$R/{\left( {{R^2} - {\omega ^2}{L^2}} \right)^{1/2}}$$
EXAM MAP
Medical
NEET