List of top Electrical Engineering Questions

The frequency modulation of a 3-\(\phi\) sinusoidal pulse width modulation is an odd multiple of 3. Then the output line voltage contains

The \( Z \) parameter \( Z_{21} \) of the following circuit is

The \( h \) parameters of the following circuit is

For an input voltage \( v = 10 \sin 1000t \), the Thevenin's impedance at the terminals X and Y for the following circuit is

In a 3-$\phi$ star connected balanced circuit, if angle between phase voltage \( V_p \) and phase current is \( \theta \) (leading), then the wattmeter readings in two wattmeter method are:

____ fault analysis is used to calculate the rupturing capacity of circuit breakers

Which of the following triggering circuits can be used in feed-back control systems?
Design minimum value of capacitance \( C \) needed for a Buck converter with a frequency \( f = 100 \, \text{kHz} \) so that ripple voltage \( V_r \) is less than 1% of output voltage \( V_o \). Assume the duty ratio \( \delta = 0.6 \) and inductor \( L = 25 \, \mu H \).
The ratio of latching current to holding current of SCR
A 1-\(\phi\) inverter is fed with an RLC series load of \( R = 1\,\Omega, X_L = 6\,\Omega \) and \( X_C = 7\,\Omega \). Then the phase angle between fundamental current and third harmonic voltage is
Which of the following is not a feature of CSI fed AC motor drive?
A 1-\(\phi\) AC voltage controller feeds a load resistance of \( R \). If firing angles of two switches are off set at \( 180^\circ \), then rms value of input current is
A 3-\(\phi\) semi-converter drives a dc motor which runs at a rated speed of 1000 rpm at \( 0^\circ \) firing angle. Find the speed of the motor when firing angle is \( 60^\circ \).
A 230 V supply is excited into a motor controlled by a 220 V, 50 Hz, 1-\(\phi\), full-converter. What is the minimum firing angle when back emf equal to 190 V?
The instantaneous voltage wave-form of a 3-\(\phi\) fully controlled rectifier with R-L load is more negative and less positive when the firing angle ‘α’ lies between
Find rms value of output voltage of a 220 V input Type A chopper for a duty ratio of 0.25, assuming a voltage drop of 2 V across the chopper when it is on.
The sequence of devices in the order of decreasing frequency of operation are
A 1-\(\phi\) fully controlled bridge rectifier with a highly inductive load is fired at an angle of cos\(^{-1}(0.8)\). Assuming the load current is pure dc, the input power factor is
Choose the most correct Voltage vs. Frequency plot of a 3-phase variable speed Induction motor drive at constant flux operation
A snubber circuit used for protection of a power diode consists of
In 8085 μP, the NOP operation is
A 4×1 Multiplexer consists of
The input frequency of seven cascaded T flip-flops is 512 kHz. What is the time period of the output?
For an 8-bit counter ramp A/D converter driven by 1000 kHz clock, calculate maximum conversion time.
The depletion mode MOSFET is also known as