List of top Electrical Engineering Questions

For a two-port network to be reciprocal, it is necessary that ……..

Find the current through 3 ohm resistor using superposition theorem

 

Consider a three-core, three-phase, 50 Hz, 11 kV cable whose conductors are denoted as R, Y and B in the given figure. The inter-phase capacitance (C1) between each pair of conductors is 0.2 $\mu$F and the capacitance (C2) between each line conductor and the sheath is 0.4 $\mu$F.

 

The bus impedance matrix of a 4-bus power system is given.

A branch having an impedance of \( j0.2 \Omega \) is connected between bus 2 and the reference. Then the values of \( Z_{22,new} \) and \( Z_{23,new} \) of the bus impedance matrix of the modified network are respectively _______.

 

In an inverting RC integrator using an Op-amp, \( RC = 1\,\text{s}, \, V_i = 5\,\text{V} \), then \( V_o = \, \_\_\_\_\_\_\_ \)

For the figure below, \( x(t) \) and \( y(t) \) are related as _______.

 

Which of the following signals are periodic?
\[ x(t) = \sin t + \cos 2\pi t \\ y(t) = \sin 2\pi t + \sin 5t \\ z(t) = \sin t + \cos \pi t \]

When the input to Q is a 1 level, the frequency of oscillations of the timer circuit is _______.

 

The logic circuit given below converts a binary code \(Y_1, Y_2, Y_3\) into _______.

 

An ammeter has a current range of 0–5 A, and its internal resistance is 0.2 Ω. In order to change the range to 0–25 A, we need to add a resistance of ________.

The bus admittance matrix of the network shown in the given figure, for which the marked parameters are per unit impedance, is _______.

 

A transformer has a core loss of 64 W and copper loss of 144 W. When it is carrying 20% over load current, the load at which this transformer will operate at the maximum efficiency is _______.
The number of roots of $s^3 + 5s^2 + 7s + 3 = 0$ in the right half of the s-plane is _______.

In the signal flow graph shown below, the transfer function is _______.

 

With a negative feedback, the system gain and stability _______ respectively.
In an AC circuit the voltage applied is $v = 230\sin(\omega t - 30^\circ)$ volts. If the current flowing is $i = 47\sin(\omega t + 10^\circ)$ amps, then the current _______.
The impedance of a circuit is 10 ohms. If the inductive susceptance is 1 S, then inductive reactance of the circuit is_______.
The system $y(t) = tx(t) + 4$ is_______.
In the given circuit a charge of 900 C is delivered to the 100 V source in a minute. The value of $V_1$ must be _______.
If a system transfer function has some poles lying on the imaginary axis, it is _______.
A slide potentiometer has 5 wires 2m each. With the help of a standard voltage source of 1.234 V, it is standardized by keeping the jockey at 123.4 cm. If resistance of potentiometer wire is 10000$\Omega$, then the value of working current will be _______.
In a $\Delta$–$Y$ transformer, the phase shift between primary and secondary is _______.
Which one of the following is not a vectored interrupt?
The interrupting time of a circuit breaker is the period between the instant of _______.
The line impedance of a three-phase transmission line is given by
\[ Z = (10 + j5)\Omega. \] For 100 MVA power delivered at 132 kV, the transmission loss is _______.