01․ A current in a circuit is given by,
02․ A circuit with resistor, inductor, capacitor in series is resonant of 50 Hz. If all the values are now doubled, the new resonant frequency is
03․ Can a 250 V, 5 A single way switch be used in place of a 250 V, 15 A Switch?
The contact strip will melt if current more than 5 A flows in 250 V, 5 A rated switch .
04․ A periodic voltage having the Fourier series V(t)= {1 + 4sinω0t}
05․ For the resonance circuit ω0 = 105, Q = 50, R = 400 Ω the value of C is
06․ An AC voltage of 200 V at 50 Hz is applied to a coil which draws 5 A and dissipates 1000 W. The resistance and impedance of the coil respectively are
P = 1000W; I2R = 1000W; R = 1000/52 = 40 Ohm
V = 200V; I = 5A; Z = V/I = 200/5 =40 Ohm
07․ In what connection we get neutral?
Star connection is a method of connecting 3 - phase circuit in such a way that one end of each phase of 3 - phase are connected together thus forming a common star point called neutral.
08․ What is the relation between line voltage and phase voltage in case of delta connection?
In case of delta connection, there is no neutral and so the phase voltage Vph = VAC, which is the line voltage as is evident from the below figure.
09․ A capacitor of 50 microfarad is connected in series with a resistance of 120 Ω. If above circuit is connected across 240 V, 50 Hz 1 - φ supply. Find the capacitive reactance?
10․ Link in network theory refers to
Link / chord is the branch of a graph that does not belong to the particular tree. It is simply called a link.
Let B be branch, N be nodes.
Then twig = N -1.
Link, L = B -( N - 1) = B - N + 1.
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