_______are the materials having electrical conductivity much less than most of the metals but much greater...

_______are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
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Semi-conductors are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.

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Materials having electrical conductivity much less than most of the metals but much greater than that of...

Description : Materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators, are known as A. Thermistors B. Varistors C. Semi-conductors D. Variable resistors. 

Last Answer : Materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators, are known as Semi-conductors.

The voltages across various discs of suspension insulators having identical discs are different due to:

Description : The voltages across various discs of suspension insulators having identical discs are different due to:  (A) Surface leakage currents  (B) Series capacitance of lines  (C) Shunt capacitance to ground  (D) Series and shunt capacitances

Last Answer : The voltages across various discs of suspension insulators having identical discs are different due to: Shunt capacitance to ground 

List the properties of line insulators in brief

Description : List the properties of line insulators in brief

Last Answer : Following are the properties of line insulators:  A) Electrical Properties of insulating material:- 1. It should have high resistance. 2. It should have high breakdown voltage. 3. It should have high ... of insulating material:- 1. It should have longer life. 2. It should have low cost

Compare pin type and suspension insulators on given points: (i) Position of insulator on cross arm. (ii) Position of conductor on insulator. (iii) Reaction on cross arm. (iv) Possibility of flash over due to large birds (v) Maintenance/Replacement cost (vi) Maximum voltage level (vii) Effect on height of supporting structure. (viii) Life

Description : Compare pin type and suspension insulators on given points: (i) Position of insulator on cross arm. (ii) Position of conductor on insulator. (iii) Reaction on cross arm. (iv) Possibility of ... Replacement cost (vi) Maximum voltage level (vii) Effect on height of supporting structure. (viii) Life 

Last Answer : S.No  Points Pin Type insulator Suspension or Disc Type insulator 1 Position of insulator on cross arm It is fixed on top of cross arm by using galvanized steel pin. So it is ... so to maintain minimum ground clearance height of pole increase.  8 Life Less More

Which have more free electrons: conductors or insulators?

Description : Which have more free electrons: conductors or insulators? 

Last Answer : Conductors have many free electrons whereas insulators have very few or none at all.

Name two good conductors, two good insulators, and two semiconductors.

Description : Name two good conductors, two good insulators, and two semiconductors.

Last Answer : In general all metals are good conductors, with silver the best and copper second.

Pick out the wrong statement. (A) Copper is the metal having the highest electronic conductivity (B) Hardenability & Weldability of metals are inversely related (C) Covalent bonding formed by sharing of electrons is present in all semiconductor materials (D) Glass transition temperature applies to 'polymers' but not to 'glasses'

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Last Answer : Option A

What is the high electrical conductivity of metals is primarily due to?

Description : What is the high electrical conductivity of metals is primarily due to?

Last Answer : In metals electrons are in a free movement.

(3) reflection of light due to the presence of free electrons Explanation: Lustre (or luster) is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the latin lux, meaning "light", and generally implies radiance, gloss, or brilliance. Metals in general have high electrical conductivity, high thermal conductivity, and high density. Typically they are malleable and ductile, deforming -under stress without cleaving.

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Last Answer : Cloud is a colloidal dispersion of – (1) Air in a dispersion medium of water (2) Fog in a dispersion medium of water (3) Mist in a dispersion medium of air (4) Water drops in a dispersion medium of air

The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K) (A) T (B) 1/T (C) T2 (D) 1/T2

Description : The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K) (A) T (B) 1/T (C) T2 (D) 1/T2

Last Answer : A) T

Which of the following materials has the poorest electrical conductivity? (A) Carbon (B) Aluminium (C) Silver (D) Stainless steel

Description : Which of the following materials has the poorest electrical conductivity? (A) Carbon (B) Aluminium (C) Silver (D) Stainless steel

Last Answer : (A) Carbon

Which of the following physical properties is TRUE of most dense ceramic materials? w) high tensile strength x) good ductility y) high compressive strength z) high electrical conductivity

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Last Answer : ANSWER: Y -- HIGH COMPRESSIVE STRENGTH

The _______are members of the_____________ a. Green Algae; Protozoa b. Radiolarians; Apicomplexans c. Dinoflagellates; Phytoplankton d. Radiolarians; Fungus-Like Protists

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Last Answer : c. Dinoflagellates; Phytoplankton

_______are financial contracts that derive their value from an underlying assets. a. Future b. Forward c. Derivatives

Description : _______are financial contracts that derive their value from an underlying assets. a. Future b. Forward c. Derivatives

Last Answer : c. Derivatives

A metallic alloy in general as compared to their pure metal components is (A) More corrosion resistant (B) Having higher melting point (C) Having lower hardness, reactivity and fusibility (D) Having lower electrical conductivity

Description : A metallic alloy in general as compared to their pure metal components is (A) More corrosion resistant (B) Having higher melting point (C) Having lower hardness, reactivity and fusibility (D) Having lower electrical conductivity

Last Answer : (A) More corrosion resistant

Which of the following criterion is used for any metal to be used as a cooking material? (1) More specific heat (2) More thermal conductivity (3) Less thermal conductivity (4) Less electrical conductivity

Description : Which of the following criterion is used for any metal to be used as a cooking material? (1) More specific heat (2) More thermal conductivity (3) Less thermal conductivity (4) Less electrical conductivity

Last Answer : (3) Less thermal conductivity Explanation: A metal to be used as a cooking material should have less thermal conductivity.

Which of the following criterion is used for any metal to be used as a cooking material ? (1) More specific heat (2) More thermal conductivity (3) Less thermal conductivity (4) Less electrical conductivity

Description : Which of the following criterion is used for any metal to be used as a cooking material ? (1) More specific heat (2) More thermal conductivity (3) Less thermal conductivity (4) Less electrical conductivity

Last Answer : Less thermal conductivity 

With rise in temperature the resistance of pure metals?

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

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

On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because – (1) metals have higher thermal capacity than plastics (2) plastics have a lower density than metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals

Description : On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because - (1) metals ... metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals

Last Answer : (3) metals are good conductors of heat Explanation: On a chilly day, the room temperature is lower than our body temperature. Since metals have a higher coefficient of thermal conductivity than plastic, they ... from our fingers will flow to the metal cap much more quickly than to the plastic body.

On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because : (1) metals have higher thermal capacity than plastics (2) plastics have a lower density than metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals

Description : On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because : (1) metals ... metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals

Last Answer : metals are good conductors of heat

When placed close together, two positively charged materials will?

Description : When placed close together, two positively charged materials will? A.attract B.become neutral C.become negative D.repel

Last Answer : When placed close together, two positively charged materials will? A.attract B.become neutral C.become negative D.repel

Materials with lots of free electrons are called?

Description : Materials with lots of free electrons are called? A.conductors B.insulators C.semiconductors D.filters

Last Answer : Materials with lots of free electrons are called? A.conductors B.insulators C.semiconductors D.filters

Insulating materials have the function of?

Description : Insulating materials have the function of?

Last Answer : Insulating materials have the function of preventing an open circuit between the voltage source and the load.

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

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.

The property by virtue of which metals can be beaten into thin sheets is known as: A. Density B. Malleability C. Conductivity D. Ductility

Description : The property by virtue of which metals can be beaten into thin sheets is known as: A. Density B. Malleability C. Conductivity D. Ductility

Last Answer : ANSWER: B

Superconductors are those elements – (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperature (3) Which conduct electricity only at super-high temperature (4) Which conduct electricity only, at super-high temperatures

Description : Superconductors are those elements – (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperature (3) Which conduct electricity only at super-high temperature (4) Which conduct electricity only, at super-high temperatures

Last Answer : (2) Whose resistance falls almost to zero at very low temperature Explanation: Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in ... lines from the interior of the superconductor as it transitions into the superconducting state.

Which °fine metals has the maximum thermal conductivity? (1) Iron (2) Aluminium (3) Silver (4) Copper

Description : Which °fine metals has the maximum thermal conductivity? (1) Iron (2) Aluminium (3) Silver (4) Copper

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Which of the following properties is generally found, in non-metals?' (1) Brittleness (2) Conductivity (3) Ductility (4) Malleability

Description : Which of the following properties is generally found, in non-metals?' (1) Brittleness (2) Conductivity (3) Ductility (4) Malleability

Last Answer : (1) Brittleness Explanation: An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on nonmetals, they shatter into pieces.

Dittus-Boelter equation cannot be used for molten metals mainly due to its very low (A) Prandtl number (B) Grashoff number (C) Thermal conductivity (D) Viscosity

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Last Answer : (A) Prandtl number

For metals, the conductivity will be a) 0 b) 1 c) -1 d) Infinity

Description : For metals, the conductivity will be a) 0 b) 1 c) -1 d) Infinity

Last Answer : d) Infinity

Which of the following liquid metals has the highest thermal conductivity? (A) Molten sodium (B) Molten lead (C) Mercury (D) Molten potassium

Description : Which of the following liquid metals has the highest thermal conductivity? (A) Molten sodium (B) Molten lead (C) Mercury (D) Molten potassium

Last Answer : (A) Molten sodium

Refractory metals are known for which of the following properties: w) lack of chemical reactivity x) low density y) high melting point z) high thermal conductivity

Description : Refractory metals are known for which of the following properties: w) lack of chemical reactivity x) low density y) high melting point z) high thermal conductivity

Last Answer : ANSWER: Y -- HIGH MELTING POINT

A bimetallic strip commonly found in home furnace thermostats works because of the difference in this property of the two metals. Is it: w) thermal shock x) thermal conductivity y) thermal expansion z) thermal diffusivity

Description : A bimetallic strip commonly found in home furnace thermostats works because of the difference in this property of the two metals. Is it: w) thermal shock x) thermal conductivity y) thermal expansion z) thermal diffusivity

Last Answer : ANSWER: Y -- THERMAL EXPANSION

Which of the metals has the maximum thermal conductivity? (1) Iron (2) Aluminium (3) Silver (4) Copper

Description : Which of the metals has the maximum thermal conductivity? (1) Iron (2) Aluminium (3) Silver (4) Copper

Last Answer : Silver

Superconductors are those elements (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperatures (3) which turn into insulators at very low temperatures (4) which conduct electricity only at super-high temperatures

Description : Superconductors are those elements (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperatures (3) which turn into insulators at very low temperatures (4) which conduct electricity only at super-high temperatures

Last Answer : Whose resistance falls almost to zero at very low temperatures

Describe the effects of temperature on conductivity of metals.

Description : Describe the effects of temperature on conductivity of metals.

Last Answer : For metallic conductors, the resistance of all pure materials increases linearly with temperature over a limited range of temperature hence conductivity decreases. For metallic conductors, ... vibrating ions collide with the moving electrons. Hence resistance increases with increasing temperature.

Dental caries occur due to (A) Drinking water containing less than 0.2 ppm of fluorine (B) Drinking water containing greater than 1.2 ppm of fluorine (C) Drinking water containing high calcium (D) Drinking water containing heavy metals

Description : Dental caries occur due to (A) Drinking water containing less than 0.2 ppm of fluorine (B) Drinking water containing greater than 1.2 ppm of fluorine (C) Drinking water containing high calcium (D) Drinking water containing heavy metals

Last Answer : Answer : A

Fluorosis occurs due to (A) Drinking water containing less than 0.2 ppm of fluorine (B) Drinking water containing high calcium (C) Drinking water containing greater than 1.2 ppm of fluroine (D) Drinking water containing heavy metals

Description : Fluorosis occurs due to (A) Drinking water containing less than 0.2 ppm of fluorine (B) Drinking water containing high calcium (C) Drinking water containing greater than 1.2 ppm of fluroine (D) Drinking water containing heavy metals

Last Answer : Answer : C

Highly porous refractory bricks are (A) Less susceptible to chemical attack by molten fluxes and gases etc (B) Very strong (C) Having very high thermal conductivity (D) None of these

Description : Highly porous refractory bricks are (A) Less susceptible to chemical attack by molten fluxes and gases etc (B) Very strong (C) Having very high thermal conductivity (D) None of these

Last Answer : (D) None of these

Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower (A) Price (B) Corrosion resistance (C) Thermal conductivity (D) Abundant availability

Description : Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower (A) Price (B) Corrosion resistance (C) Thermal conductivity (D) Abundant availability

Last Answer : (D) Abundant availability

Low thermal conductivity of heat insulating materials is due to its (A) Dense structure (B) High proportion of air space (C) High specific heat (D) None of these

Description : Low thermal conductivity of heat insulating materials is due to its (A) Dense structure (B) High proportion of air space (C) High specific heat (D) None of these

Last Answer : (B) High proportion of air space

A composite flat wall of a furnace is made of two materials 'A' and 'B'. The thermal conductivity of 'A' is twice of that of material 'B', while the thickness of layer of 'A' is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material 'A' is (A) 125 (B) 133 (C) 150 (D) 160

Description : A composite flat wall of a furnace is made of two materials 'A' and 'B'. The thermal conductivity of 'A' is twice of that of material 'B', while the thickness of layer of 'A' is half that of B. If the temperature ... drop (in °K) across the layer of material 'A' is (A) 125 (B) 133 (C) 150 (D) 160

Last Answer : (D) 160

A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is __________ °C. (A) 6 (B) 12 (C) 18 (D) 24

Description : A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature ... difference across the layer A is __________ °C. (A) 6 (B) 12 (C) 18 (D) 24

Last Answer : (B) 12

Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of __________ °C. (A) 40 (B) 95 (C) 70 (D) 50

Description : Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface ... C will be at a temperature of __________ °C. (A) 40 (B) 95 (C) 70 (D) 50

Last Answer : (C) 70

In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the (A) Rate of firing and emissivity of flame (B) Thermal conductivity of the charge & structural materials of furnace (C) Nature of process; whether batch, continuous or intermittent (D) All (A), (B) and (C)

Description : In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the (A) Rate of firing and emissivity of flame (B) Thermal conductivity of the charge & ... (C) Nature of process; whether batch, continuous or intermittent (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Which of the following commonly used condenser tube materials has the lowest thermal conductivity? (A) Admiralty brass (B) Stainless steel (C) Aluminium brass (D) Titanium

Description : Which of the following commonly used condenser tube materials has the lowest thermal conductivity? (A) Admiralty brass (B) Stainless steel (C) Aluminium brass (D) Titanium

Last Answer : (B) Stainless steel

Which of the following building materials has the HIGHEST thermal conductivity? w) Southern pine wood x) common brick y) aluminum z) gypsum board or drywall

Description : Which of the following building materials has the HIGHEST thermal conductivity? w) Southern pine wood x) common brick y) aluminum z) gypsum board or drywall

Last Answer : ANSWER: Y -- ALUMINUM  

Which element is with the highest electrical conductivity? -Do You Know?

Description : Which element is with the highest electrical conductivity? -Do You Know?

Last Answer : answer:

Depending on the electrical conductivity, matter can be divided into how many parts ?

Description : Depending on the electrical conductivity, matter can be divided into how many parts ?

Last Answer : Depending on the electrical conduction capacity, the material can be divided into 3 main categories- 1. Conductor 2. Misconducting 3. Non-conductive