Explore topic-wise MCQs in Electrical Engineering Questions.

During the commutation period in 3 phase converter, overlap time is

In dual converters,

A TRIAC can be turned on with

In radiative coupling, the emitter radiation field

In a load commutated DC - DC chopper, the capacitor has a

Between the incoming and outgoing devices in voltage commutation

The effects of EMI can be reduced by

In EMC signal, the source delivers maximum power to the input of transmission line when the transmission line input impedance

For swept frequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length of the transmission line would

In rectifiers, load current flow is

In current commutated DC-DC choppers, the voltage spike appears across the load when

An ideal diode is

The on - state voltage drop of IGBT consists of

Advantages of HVDC transmission over AC system is / are

The maximum firing angle in the half wave controlled regulator is

In a phase controlled 3 phase ac voltage controller, the harmonic present is

The IGBT resulted in higher switching speed and lower energy losses. It can be used for

A capacitive load in voltage source inverters generates

Double edge modulation eliminates certain harmonics when the reference is a

In a full wave rectifier, the rectification ratio is approximately equal to

Bidirectional semiconductor device is

The carrier which are commonly used in constant - frequency PWM is

In the operation and control of both naturally commutated and forced commutated SCR base converter, commutation plays an important role. The converters is / are

In a three phase voltage source inverters

In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are

As the breakdown voltage reached, the DIAC exhibits

DIAC are specifically designed to trigger

In commutation PAC stands for

For power output higher than 15 kW, the suitable rectifier is

In a 3 phase bridge rectifier the ripple frequency is

The sum of all phase current in a star connected primary winding with no neutral connection is equal to

In BJT, switching losses occurs

In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes

Double fourier series analysis of PWM is

Single phase VSI are mainly used in

Very large values of modulation index (greater than 3.24) lead to

In single phase VSI, the harmonic which is not present is

If the gate voltage of an SCR is removed, then the

The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is

A full wave rectifier with resistive load produces

Under harmonic free load voltages, the 3 phase VSI

In a 3 phase CSI, if the required line output voltages are balanced and 120 degree out of phase, then the chopping angles are used to eliminate only the harmonics at frequencies

For similar carrier and modulating signals, the line current used in CSI is

The advantage of using free - wheeling diode in half controlled bridge converter is that

The most suited gate pulses given to the AC regulator with R - L load can be in the form of

The power MOSFET device is a

With increase in firing angle,

Harmonics in 3 phase inverters can be reduced by using

For a buck converter to reduce the conduction losses in diode

The conduction losses in IGBT is