The unit of impedance is ________________

(a)

mho-metre^-1

(b)

ohm

(c)

ohm-metre

(d)

mho-metre

For normal frequencies, the range of Q- factor is from _____________.

(a)

1 to 10

(b)

10 to 100

(c)

100 to 1000

(d)

101 to 999

The power factor of an a.c, circuit is _________

(a)

\(\phi \)sin\(\phi \)

(b)

cosec \(\phi \)

(c)

cos \(\phi \)

(d)

tan \(\phi \)

In an LCR series a.c, circuit, the phase difference between current and voltage is 60°. If the net reactance of the circuit is 17.32Ω, the value of the resistance is ______________.

(a)

30Ω

(b)

17.32 Ω

(c)

10 Ω

(d)

1.732 Ω

The instantaneous current in an AC circuit containing a pure inductor is i = I_o sinωt, The instantaneous emf is ___________________.

(a)

e = E_osin\(\left( \omega t+\frac { \pi }{ 2 } \right) \)

(b)

e = E_osin\(\left( \omega t-\frac { \pi }{ 2 } \right) \)

(c)

e=E_osin(ωt - π)

(d)

e = E_osin