1. f₁ = ∑m (1, 2, 4, 8, 10, 14)
2. f₂ = ∑m (2, 5, 9, 15)
3. f₃ = ∑m (2, 4, 5, 6, 7)

Assertion (A): Transformer coupling has the disadvantage of the weight of transformer and Saturation of core

Reason (R): Transformer coupling is very suitable for impedance matching

1. It has low saturation current.
2. It has high value of cut in voltage.
3. It can withstand large reverse voltage.
4. When compared with germanium diode, silicon diode shows a lower degree of temperature dependence under reverse conditions.

1. The value should remain constant under all conditions.
2. The mutual inductance should not vary with temperature.
3. The inductance should be independent of excitation.
4. They have two coils wound on a bobbin of hard magnetic material, coils being separated by a range.

Assertion (A): The velocity factor of a line is the ratio of wave velocity on the line to speed of light.

Reason (R): If the conductors of a line are immersed in a non magnetic insulating liquid, the wave velocity increases.