The ratio of intensity of magnetisation to magnetising force is called:

Which from below is that property which opposes the production of magnetic flux in it:

The magnetic force demand is :

Small magnets are made by:

Ferrites are:

Which of the following materials have maximum magnetic permeability:

Curie point temperature:

For ferromagnetic materials, the susceptibility:

Curie temperature is the temperature above which a ferro-magnetic material becomes:

The Relative permeability of mild steel (iron) iron is around:

The spontaneous magnetisation is the most important characteristic of --------- materials:

Practically, all Organic substances are:

In Carbon steel, if the percentage of carbon is increased, it has which of following effects?:

High frequency transformer cores are generally made from:

The relative magnetism under a given field - ----, as temperature approaches the Curie point:

The Eddy current produce a magnetic field of their own which --------- the main field:

The change in dimensions during the process of magnetisation is called:

Which of the following factors cause magnetic ageing?:

Which of the following materials can be used in cable shields:

Variable resistors are:

we have two copper wires of 14 gauge and 20 gauge. Which of the following will be lower for 14 gauge:

The material with lowest resistivity is:

The material with highest resistivity is:

The heating elements of electric irons are made of:

In conductors, conduction of electricity takes place due to movement of:

Copper is completely miscible with:

A Platinum wire senses temperature because of its:

On which of the following factors does the resistivity of a material depend:

The metal having the lowest temperature coefficient of resistance is:

Commonly used Conducting materials are:

Which of the following materials is preferred for transmitting electrical energy over a long distance:

High resistivity materials are used in:

Mercury as an electric contact material is:

The coils of DC Motor starter are wound with wire of :

By increasing impurity content in the metal alloy, the residual resistivity always:

Constantan contains:

Which of the following is the Poorest conductor of electricity:

In thermocouples which of the following pair is commonly used:

Solder is an alloy of:

-------- is most commonly used for making magnetic recording tape.'Choose the corrrect answer'!

A good electric contact material should have all of the following properties except:

Carbon resistors contain:

Which of the following material is not a Semiconductor:

Which of the following material is not a Semiconductor:

Platinum is used in:

Due to which of the following reasons, Copper and Aluminium are not used for heating elements:

Copper, even though costly find uses in the windings of electrical machines, because:

Substances whose specific resistances decreases abruptly at low temperature are called:

Due to which of the following fact, in India, Aluminium is replacing Copper:

If a resistance of a conductor does not vary in accordance with OHM's law, it is known as:

Reluctivity is analogous to:

Hysteresis loss depends on:

Eddy current in a core will be reduced considerably by:

Insulators have:

Resistivity of electrical conductors is most affected by:

Application of paper in insulating material is restricted to temperature upto:

Spark plug makes use of which of the following materials for insulation:

Effect of moisture on the insulating materials is to:

Insulators are the materials in which valence electrons are bounded:

A good insulating material should possess which of the following characteristic:

The dielectric strength of mica varies from:

Porcelain insulators are employed for insulating terminals of:

The dielectric strength of paper is:

Which of the following insulating material is in common use for Overhead Power lines:

The function of insulating liquid is:

Which of the following tests is carried out on Transformer oil:

Presence of even a trace of water in transformer oil -------- its insulation strength considerably:

Insulating gases entail which of the following major problems:

Insulation resistance --------- with increase in temperature:

Dielectrics have:

Dielectric materials are essentially:

An ideal insulating material should have low insulation resistance and dielectric strength.

Fibre glass insulation can be used up to temperature of:

Dielectric strength of PVC is around:

What is the main cause for the failure of overhead line insulators?

Asbestos has:

Asbestos can bear a temperature up to __________ without losing its insulating properties.

Which of the following insulations is used in cables?

In Transmission and Distribution sector, where should the insulators be placed?

Dielectric strength is expressed in:

Gaseous insulating material:

What is the main drawback of using paper as the insulating material?

What is the dielectric strength of impregnated paper?

Which is having higher breakdown strength?

The dielectric strength of transformer oil should be:

Which of the following kind of break-down is possible in solid dielectrics?

Loss in dielectric may occur due to:

Dielectric strength in case of mica can be expected to be more than:

The impurity in liquid dielectric which has significant effect in reducing the breakdown strength, is:

A good dielectric should have all the following properties EXCEPT:

The breakdown voltage in gases depends on:

Electrolytic capacitors are:

Piezo-electric effect converts:

Capacitors that use vacuum, air or other gases as dielectric have:

Photo diode is:

High dielectric constant material is must for:

Example for piezo-electric material:

A solar still is a device used for:

All transducers act as:

10 nm = _____ m

The size of nanoparticles is between _____ nm.

Carbon atoms make ____ type of bond with other carbon atoms.

Who coined the word 'nanotechnology'?

1 micrometer (micron) = ______ m.

The full form of STM is...

The applications of nanotechnologies are expected to bring everyday benefits for consumers through:

Which ratio decides the efficiency of nanosubstances?

The two important properties of nanosubstances are...

The electrical conductivity of a nanotube is ____ times that of copper.

The width of a carbon nanotube is ____ nm.

The hardest material found in nature is ______.

The tensile strength of a carbon nanotube is _____ times that of steel.

What is the general name for the class of structures made of rolled up carbon lattices?

What are the advantages of nano composite packages?