A two branch parallel circuit has a 20 Ω resistance and 1 H inductance in one branch and a 100 µF capacitor in the second branch. It is fed from 100 V ac supply, at resonance, the input impedance of the circuit is

According to Kirchhoff’s voltage law, the algebraic sum of all IR drops and e.m.f. in any closed loop of a network is always

A. Negative

B. Positive

C. Determined by battery e.m.f.

D. Zero

The number of independent equations to solve a network is equal to

A. The number of chords

B. The number of branches

C. Sum of the number of branches and chords

D. Sum of number of branches, chords and nodes

A closed path made by several branches of the network is known as

A. Branch

B. Loop

C. Circuit

D. Junction

Which of the following is not a nonlinear element ?

A. Gas diode

B. Heater coil

C. Tunnel diode

D. Electric arc