Q. In an RC series circuit excited by dc voltage E, the current at t = 0 is

View solution

Q. The current through a 10 Ω resistance in a dc circuit having two emf sources is 3A. If this resistance is changed to 20 Ω, the new value of current will be

View solution

Q. An RLC series circuit has R = 30 Ω, XL = 30 Ω and XC = 30 W. Its impedance is

View solution

Q. R, L and C are in parallel. The circuit is switched on to a constant current source I at t = 0. At t = ∞ the current through inductance is I.

View solution

Q. As temperature increases, the temperature coefficient of metals increases.

View solution

Q. In a 3 phase system, the zero sequence component of line to line voltages is zero

View solution

Q. Magnetic effect of current is used in generators but not in motors.

View solution

Q. For a nonlinear resistance

View solution

Q. Assertion (A): For a physically realisable driving point function, the degree of numerator and denominator should be equal.

Reason (R): The sum of positive real functions is real.

View solution

Q. An R-L series circuit has R = 5 Ω and L = .01 H. It is fed by ac 50 Hz supply. The rms current in the circuit is 5 A. The active power supplied by the source is

View solution

Q. A particular current is made up of two components 10A dc and sinusoidal current of peak value 14.14A. The average of resultant current is

View solution

Q. Assertion (A): In series R-L-C circuit, the current may lead or lag the voltage depending on the value of R.

Reason (R): Phase angle of an R-L series circuit is tan¯¹ (ωL/R).

View solution

Q. A planar graph has 6 nodes and 7 branches. The number of meshes in the dual graph is

View solution

Q. An ac voltage 20 sin 1000t feeds an R-C series circuit. R = 8 Ω and active power is 4 W. The power factor is

View solution

Q. For a sine wave the average value is calculated over half the cycle.

View solution

Q. Two resistances of 2 Ω each are connected in series. A shunt having zero resistance is connected across the combination. The overall resistance will be

View solution

Q. The poles and zeros of a positive real function

View solution

Q. In a linear circuit, the superposition principle can be applied to calculate the

View solution

Q. If A = 7 ∠15, A² is

View solution

Q. The colour coding of a resistors shows 100 K, ± 10%. When the resistance was measured with an ohmmeter, it read

View solution