Explore topic-wise MCQs in Electrical Engineering Questions.

In a multistage impulse generator, for producing very high voltages, a bank of capacitors is

The ripple voltage for half wave rectifier is

For insulators and bushings of power transformers, circuit breakers and instrument transformers, the suitable materials is

The Townsend mechanism explains the phenomenon of breakdown

High temperature hydrocarbons have

Inelastic collisions are those in which internal changes in energy take place within an atom or a molecule at the expenses of total kinetic energy of the colliding particle. Suitable example for inelastic collisions is/are

In case of solid particles present in the liquid and in case of presence of only gas bubbles in liquids, the direction of force is towards

Which theory explains the mechanism for breakdown under different conditions?

Druyesteynian distribution applies when the ion energy is much

A gas in normal state is almost a perfect

In routine tests, the cable is tested by applying an ac voltage of

The liquid dielectrics contain voids or cavities within the medium or at the boundaries between the dielectric and the electrodes. The electric field strength in the voids is

For applications in power cables, the dielectrics most commonly used is

Liquids dielectrics are mainly used as

The example of artificial fibre is

According to the Bubble theory, once a bubble is formed, it will elongate in the direction of electric field under the influence of electrostatic forces. During elongation the volume of bubbles

According to the Stressed Oil Volume theory, the breakdown strength is

In paper based laminated construction, the typical value of dielectric constant and dielectric loss factor is

Treeing phenomenon is observed in

Which among the following is not an example of impregnants?

The resin bonded paper bushings are designed to operate at a maximum radial stress of

For very small cavities, discharge inception voltage

The most commonly used insulating materials for low and medium voltage cables is

In large impulse generators, the spark gaps are generally

Resins and varnishes are commonly used in

In a series RLC circuit, the wave front and wave tail times are controlled by changing the value

For producing large values of impulse currents, a number of capacitors are charged in

The disadvantages of resonant transformers is

The commonly used materials for HV insulation is

Series capacitance voltmeters were used with cascade transformers for measuring rms values up to

Insulation is necessary for the protection of equipment. Insulation is not necessary between

At the instant of contact separation in asymmetrical tests, the dc component is

A Capacitance Voltage Transformer can be connected to a

The temperature limit for class F insulation is

While performing temperature rise tests, at any part of the bushing the steady temperature rise above the ambient air temperature should not exceed

Formative time lag depends on the mechanism of the avalanche growth in gap. The formative time lag is usually

Within dielectric, an electron starting from the cathode will drift towards the anode and during this motion

In equipments filled with liquid dielectric, heat is transferred mainly by

The thermal breakdown stresses are

To protect the meter against high voltages in case the series resistance fails, the suitable protective device is

The voltage doubler circuit is suitable for the voltage up to

For the high voltage conductors at high pressures, if the voltage is positive then the corona appears as a

The spreading of spark channels during tracking, in the form of the branches of a tree is called

A two-pulse circuit requires

A generating voltmeter is a

In Van de Graaff generators, the shape of high voltage electrode is nearly spherical to avoid

The accuracy of the ac field strength depends on

For the measurement of ripple voltage in dc systems, the condition to be satisfied is

Insulation of dry type transformers is done using prepregs. It is manufactured by using

The tests which is not performed under power frequency tests is