A series RLC circuit is connected across a 240V, 50 Hz supply. When the voltage across capacitor is 250V, a maximum current of 0.5A flows in the circuit. Find the resistance. 500 Ohms. 100 Ohms. 1000 Ohms. 480 Ohms. TRUE ANSWER : ? YOUR ANSWER : ?
Efficiency of electrical machines should be calculated by measuring output and input. losses. losses and output. losses and input. TRUE ANSWER : ? YOUR ANSWER : ?
The breakdown voltage for paper capacitor is usually 200 to 1600 volts. 2000 to 3000 volts. more than 10000 volts. 20 to 60 volts. TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the correct relation? AD-BC = 1. AC-BD = 1. AB-CD = 1 . all of these. TRUE ANSWER : ? YOUR ANSWER : ?
By which of the following elements transients will not occur? R All of these L C TRUE ANSWER : ? YOUR ANSWER : ?
A parallel plate capacitor with air as dielectric, force between plate is F. If capacitor is now immersed water of dielectric εr, force between plate will be – F εr. F. εr/F. 0. TRUE ANSWER : ? YOUR ANSWER : ?
A battery of E Volts is supplying a steady current to a series circuit of total resistance RΩ and inductance L Henry. A part R1 of the total resistance is suddenly short circuited. Find the expression for current flowing through the battery subsequent to the operation. i = {E / R}[1-(R1 / R) *e - {(R - R1 )*t/L} None of these i = {E / R1 - R)}(1- e - (R1 - R) t / L) i = {E / (R - R1)}[1-(R1 / R) *e- {(R - R1 )t/L} TRUE ANSWER : ? YOUR ANSWER : ?
A certain network consists of large number of ideal linear resistances, one of which is designated as R and two constant ideal source. The power consumed by R is P1 when only the first source is active and P2 when only second source is active. In both sources are active simultaneously then the power consumed by R is P1 ± P2 . (P1 ± P2 )2. (√P1 ± √P2)2. √P1 ± √P2. TRUE ANSWER : ? YOUR ANSWER : ?
A capacitor is charged by a constant 10 mA current sources which is turned on for 1 second. Assuming the capacitor is initially charge free; determine the charge delivered to and the power supplied by the source if the capacitor has a value of 1 mF. 0.01C and 5W. 0.1C, 10MW. 0.1C, 100MW. 0.01C, 10MW. TRUE ANSWER : ? YOUR ANSWER : ?