List of top Electrical Engineering Questions

Heating element of an electric iron is normally made-up of:
Which of the following theorems is the dual of Norton’s theorem?
Time scaling is an operation performed on:
The system \( y(t) = x(2t) + 3 \) is:
Forced response is the solution of the difference equation when:
The power consumed by a coil is 300 watts when connected to a 30V DC source and 108 watts when connected to a 30V AC source. The reactance of the coil is ____ .

The equivalent resistance between the points X & Y of the circuit shown below is _____ \(\Omega\).

The equivalent resistance

The supply voltage magnitude \( |V| \) of the circuit shown below is ____ .
The supply voltage magnitude

Which of the following can produce maximum induced voltage?
An electric fan and a heater are marked 100W, 220V and 1000W, 220V respectively. The resistance of the heater is ____ .
Two bulbs of 100W, 200V and 150W, 200V are connected in series across a supply of 200V. The power consumed by the circuit is ____ .
If 125V is applied across a 250V, 100W incandescent bulb, the power consumed will be _____ .
A single-phase AC voltage source has 200V (RMS) and a system connected consumes an active power of 300 Watts. What is the reactive power consumed by the system if 2.5A (RMS) current is drawn?
The resistance of a copper motor winding at room temperature (20° C) is 3.42 \(\Omega\). After extended operation at full load, the motor winding measures 4.22 \(\Omega\). Determine the rise in temperature. The temperature coefficient $\alpha$ is 0.00426/°C.

A closed-loop system has the characteristic equation given by: $ s^3 + k s^2 + (k+2) s + 3 = 0 $. 
For the system to be stable, the value of $ k $ is:

With reference to the Fast Fourier Transform, if \( W_4^1 = W_x^2 \), then what is the value of \( x \)?

The output of the following 8051 Assembly code is: 

The transfer function of a first-order controller is given as: \[ G_c(s) = K \frac{(s + a)}{(s + b)} \] where \( K, a, b \) are positive real numbers. The condition for this controller to act as a phase lag compensator is:
Four identical alternators each rated for 20 MVA, 11 kV having a sub-transient reactance of 16% are working in parallel. The short circuit level at the bus bars is:
Surge impedance of a lossless transmission line is (if \( L \) = inductance/m and \( C \) = capacitance/m):
The breakdown strength of air for small gaps (1 mm) under uniform field condition and standard atmospheric conditions will be:
Optimum number of stages for Cockcroft-Walton voltage multiplier circuit are:
The most important test to assert the proper functions of a surge diverter is:
The state variable description of a system is: \[ \dot{X} = AX + BU, \quad A = \begin{bmatrix} 0 & 3 \\ 3 & 0 \end{bmatrix} \] The poles of the system are located at:
An R-C voltage divider has an HV arm capacitance, \( C_1 = 600 \) pF, resistance \( R = 400 \) \( \Omega \), and equivalent ground capacitance \( C_g = 240 \) pF. The effective time constant of the divider in nanoseconds is: