1
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
In an $$a.c.$$ circuit the voltage applied is $$E = {E_0}\,\sin \,\omega t.$$ The resulting current in the circuit is $$I = {I_0}\sin \left( {\omega t - {\pi \over 2}} \right).$$ The power consumption in the circuit is given by
A
$$P = \sqrt 2 {E_0}{I_0}$$
B
$$P = {{{E_0}{I_0}} \over {\sqrt 2 }}$$
C
$$P=zero$$
D
$$P = {{{E_0}{I_0}} \over 2}$$
2
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
In a series resonant $$LCR$$ circuit, the voltage across $$R$$ is $$100$$ volts and $$R = 1\,k\Omega$$ with $$C = 2\mu F.$$ The resonant frequency $$\omega$$ is $$200$$ $$rad/s$$. At resonance the voltage across $$L$$ is
A
$$2.5 \times {10^{ - 2}}V$$
B
$$40$$ $$V$$
C
$$250$$ $$V$$
D
$$4 \times {10^{ - 3}}V$$
3
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
In an $$AC$$ generator, a coil with $$N$$ turns, all of the same area $$A$$ and total resistance $$R,$$ rotates with frequency $$\omega$$ in a magnetic field $$B.$$ The maximum value of $$emf$$ generated in the coil is
A
$$N.A.B.R.$$$$\omega$$
B
$$N.A.B$$
C
$$N.A.B.R.$$
D
$$N.A.B.$$$$\omega$$
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
The self inductance of the motor of an electric fan is $$10$$ $$H$$. In order to impart maximum power at $$50$$ $$Hz$$, it should be connected to a capacitance of
A
$$8\mu F$$
B
$$4\mu F$$
C
$$2\mu F$$
D
$$1\mu F$$
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