# Resistance of a material always decreases if?

Resistance of a material always decreases if?

Resistance of a material always decreases if number of free electrons available become more.

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Last Answer :  The size of a synchronous motor decreases with the increase in flux density.

Description : Resistance

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Description : Temperature co-efficient of resistance is expressed in terms of?

Description : International ohm is defined in terms of the resistance of?

Last Answer : International ohm is defined in terms of the resistance of a column of mercury.

Description : When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will?

Last Answer : When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will increase.

Description : Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as?

Last Answer : Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as 2 : 5.

Description : The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is?

Last Answer : This  is  because  resistance  of  a  conductor  increases  with  increase  in  temperature .

Description : A closed switch has a resistance of?

Last Answer : A closed switch has a resistance of zero.

Description : If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes?

Last Answer : If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes 0.4 ohm.

Description : The resistance of a few meters of wire conductor in closed electrical circuit is?

Last Answer : The resistance of a few meters of wire conductor in closed electrical circuit is practically zero.

Description : With rise in temperature the resistance of semi-conductors?

Last Answer : With rise in temperature the resistance of semi-conductors decreases.

Description : With rise in temperature the resistance of pure metals?

Last Answer : With rise in temperature the resistance of pure metals increases.

Description : The resistance of a conductor varies inversely as?

Last Answer : The resistance of a conductor varies inversely as area of cross-section.

Description : evergreen decking material

Last Answer : To do away from the problems associated with wood, such as high costs and decaying, alternative materials were introduced to the deck-builder market. Composite materials are the most popular among these ... driver can damage the groove edge of the board; aregular decking screw can be used instead.

Description : boat decking material

Last Answer : You love staying in the upper deck of your boat while going on a cruise. It serves as your shelter from rain or direct sunlight, at the same time, it treats you to a great view of vast ... When the outer shell is surfaced with a weatherproof material, metal and wood as frames are not much different.

Description : The Guide to Decking Material

Last Answer : Let's face it. The worst enemy of our home's interior are our kids and pets. All that's required to maintain the inside of our home is a little dusting, vacuuming and cleaning. For the ... of them come in various solid colors, which may work to your advantage when trying to cut painting costs.

Description : wood decking material

Last Answer : Most builders choose wood as the main material for decks for several reasons. With proper treatment, wood is expected to last for years without needing any kind of repair. It is also ... for their expensive prices, all people should be encouraged to purchase natural wood decking materials only.

Description : plastic decking material

Last Answer : Modern times call for modern solutions. If before, wood was the only material used to make decks, innovative alternatives are now available to avoid the problems associated with wood. Alternative materials ... with plastic decking materials; you don't need special tools to install them in your home.

Description : decking material prices

Last Answer : Adding a deck to your house provides you with a new place to lounge around and host parties and improve the look of your home. Various materials may be used to build the deck. Naturally, prices also ... tend to have a trade-off in aesthetic quality, if not on the caliber of the very structure.

Description : composite decking material

Last Answer : If you plan to add a new deck to your home, you're probably thinking about what material to use. Most people would look no further and will instantly get hardwood like Cedar and Redwood. ... against innovations, such a type of material is a very welcome development in the world of deck building.

Description : best decking material

Last Answer : Today, homeowners are not only limited to choosing wood as the main material for their new deck. More modern materials such as composites and plastic are also available. The obvious question is ... decking material still depends on what you need and which among the factors above is your priority.

Description : alternative decking material

Last Answer : Wood is the most popular decking material. It has the perfect fusion of beauty and firmness, so we need not ask why it is still the main choice of deck builders. Wood can also be ... your neighbors, consider using alternative decking materials, such as Veranda boards, when building your own deck.

Description : Overalls. Which material is better?

Last Answer : Material is the most important factor to look out for when choosing workwear. Usually cotton, polyester or blended fabrics are chosen for the manufacture of workwear. Each option has ... , operating conditions and personal preferences. Work clothes should provide employees with comfort and safety.

Description : What material should children's furniture be made of?

Last Answer : The most ideal option is furniture made from natural wood. Such material is environmentally friendly, however, many varieties of valuable species are quite expensive. In view of the limited family ... your liking, because, despite its versatility and safety, it should please and bring pleasure.

Description : Suggest the diode material suitable to rectify 0.5V AC signal.

Last Answer : The diode material suitable to rectify 0.5V AC signal is silicon

Description : State two applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material.

Last Answer :  (i) Application of PVC paper : 1. It is used in slot lining or motor winding insulation purpose 2. For Insulation of Transformer winding (ii) Application of Porcelain : 1. Mainly used for manufacturing ... on withstand temperature : * H' & C' Class of insulation i e. 180° and above 180°C

Description : State gaseous and liquid insulating material.

Last Answer : i) Gaseous insulating material : 1. Air 2. Nitrogen 3. Hydrogen 4. SF6 ii) liquid insulating material: 1. Transformer oil 2. Capacitor oil 3. Cable oil 4. Pyranol 5. Savotal 6. Savol 7. Vegetable oil 8. Silicon liquids

Description : State the material used for making (1) Magnetic Core (2) Fuse element

Last Answer : The material used for making of:  (1) Magnetic Core : Iron, cobalt, Nickel, CRGO, HRGO , silicon steel  (2) Fuse Element: Tin- lead wire, Tinned copper wire

Description : State properties of conductor material used for overhead conductor.

Last Answer : Following are the properties of conductor material:-   1. High conductivity :- Material should have high conductivity 2. High mechanical strength:- Material should have sufficiently high mechanical strength ... available & less costly. 9. Scrap Value: - Material should have high scrap value.

Description : (i) Explain the process of diffusion in semiconductor material. (ii) Explain Hall effect.

Last Answer : (i) Diffusion: In a semi conductor bar a concentration gradient exist when either number of electrons or holes is greater in one region of a semi conductor as compared to other region. When ... to determine whether a semiconductor is N type or P type, and to find carrier concentration

Description : Write one application for the give dielectric material. (i) Polyvinyl Carbide(PVC) (ii) Glass (iii) Mica (iv) Cotton and Silk

Last Answer : (i) Polyvinyl Carbide(PVC):it is used in insulation of wires and cables in domestic wiring as well as in aircraft and factory wiring (any one)  (ii) Glass: 1) Alkaline glasses are used for ... with wax or varnishes are used in windings of magnet coils and small medium sized mechanics (any one)

Description : State function of Busbar and which material is used for busbar?

Last Answer : Function of Busbar Bus-bar: - Distribute the load on 3-phase four wire systems. To provide number of connection of incoming line and to provide easy way to connect number of sub circuit. ... to the element. This element means busbar Material is used for busbar: 1. Copper 2. Alluminium

Description : What is piezoelectric effect? Name two piezoelectric material.

Last Answer : piezoelectric effect: Piezoelectric effect can be stated as follows: when a pressure or force or vibration is applied to crystalline material like quartz crystal or crystalline substances, then ... crystal: Quartz crystal ,Rochelle salt 2) Synthetic crystals : Barium Titanate, Lithium sulphate

Description : Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.

Last Answer : (i) Material used for Moving coil: Copper, Aluminum( some times)  (ii) Permanent magnets are made of special alloys such as :  Aluminum-Nickel-Cobalt (Alnicos)  Strontium-Iron  Neodymium-Iron-Boron  Samarium-Cobalt.

Description : State the material used for moving coil and former for PMMC instruments.

Last Answer : Material Used for Moving Coil and Former for PMMC Instruments:  Material used for moving coil: Copper  Material used for Former: Aluminium

Description : Based on temperature withstanding ability, classify insulating material.

Last Answer : class Temperature withstanding ability in 0C Materials Y 90 Cotton, silk paper and similar organic materials neither impregnated nor immersed in any oil, rubber, PVC. A 105 ... rubber compounds C Above 180  Mica, ceramics, glass, Teflon, quartz, etc.

Description : List four examples of insulating material and explain any two.

Last Answer : Examples of insulating materials:  i) Solid: Ceramic, Porcelain, Mica, Glass, Rubber, Resinous, Fibers  ii) Liquid: Synthetic, Mineral etc.  iii) Gaseous: Hydrogen, Air, ... and low hygroscopicity.  Uses: Insulation in electric field, transformer stampings, armature, pole stampings

Description : What is amorphous metal material? Give any three properties of amorphous metal.

Last Answer : Amorphous metal: The amorphous is metal alloy which differ in crystalline structure. The atoms are arranged in random configuration.  Properties of amorphous metal: 1) Thermal conductivity of ... . 6) The alloy does not undergo shrinkage on solidification, which helps in bones attachments.

Description : What is dielectric strength of an insulating material? What is its unit?

Last Answer : Dielectric Strength: The dielectric strength of an insulating material is the maximum voltage which the insulating medium can withstand without breakdown. Unit is volts per millimeter (V/mm), or kV/mm or kV/cm

Description : What are insulating material?

Last Answer : Insulating material: Insulating material is that which offers very high resistance to the flow of current through it.

Description : The magnetic susceptibility of paramagnetic material is: A) Less than zero B) Less than one but positive C) Greater than one D) Equal to zero

Last Answer : The magnetic susceptibility of paramagnetic material is: Less than one but positive

Description : The desirable properties of transformer core material are  (1) low permeability and low hysteresis loss. (2) high permeability and high hysteresis loss. (3) high permeability and low hysteresis loss. (4) low permeability and hysteresis loss.

Last Answer : The desirable properties of transformer core material are high permeability and low hysteresis loss.

Description : The material used in liquid fuses is  (1) SF6 (3) carbon tetra chloride (2) distilled water (4) transformer oil

Last Answer : The material used in liquid fuses is  carbon tetra chloride

Description : The property of a material which opposes the creation of magnetic flux in it is known as?

Last Answer : The property of a material which opposes the creation of magnetic flux in it is known as reluctance.

Description : If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be?

Last Answer : If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be large.

Description : In a magnetic material hysteresis loss takes place primarily due to?

Last Answer : In a magnetic material hysteresis loss takes place primarily due to it high retentivity.

Description : A material for good magnetic memory should have?

Last Answer : A material for good magnetic memory should have high retentivity.

Description : The relative permeability of a ferromagnetic material is?

Last Answer : The relative permeability of a ferromagnetic material is more than 100 or 1000.

Last Answer : The insulating material used between the commutator segments is normally mica.

Last Answer : The material for commutator brushes is generally carbon.