Which of the following materials is a good electrical insulator? A. wood B. silver C. copper D. gold

Which of the following materials is a good electrical insulator? A. wood B. silver C. copper D. gold
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Answer: A
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is universally used for windings of electrical machines because it is easily workable without any possibility of fracture. (a) Silver (b) Steel (c) Aluminium (d) Copper

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The metal whose electrical conductivity is more, is (1) copper (2) aluminium (3) silver (4) lead

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Which of the following materials is not used for transmission and distribution of electrical power ? (a) Copper (b) Aluminium (c) Steel (d) Tungsten

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Which of the following materials is not used for transmission and distribution of electrical power ? (a) Copper (b) Aluminium (c) Steel (d) Tungsten

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Last Answer : (d) Tungsten

Is a silver a conductor or insulator?

Description : Is a silver a conductor or insulator?

Last Answer : is copper a conductor or insuilator

Is wood a conductor or a insulator?

Description : Is wood a conductor or a insulator?

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Which is a better insulator, steel or wood garage doors?

Description : Which is a better insulator, steel or wood garage doors?

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A common type of protective covering used on electrical conductors is _____________. A. plain paper B. fibrous braid C. silver sheathing D. babbitt sheathing

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Which of the following statements represents the main difference between a relay and a contactor? A. Contactors control current and relays control voltage. B. A relay is series connected and a contactor is parallel connected. C. Contactors can handle heavier loads than relays. D. Contactors are made from silver and relays are made from copper.

Description : Which of the following statements represents the main difference between a relay and a contactor? A. Contactors control current and relays control voltage. B. A relay is series connected and a contactor ... loads than relays. D. Contactors are made from silver and relays are made from copper.

Last Answer : Answer: C

Both silver and copper oxidise in air. Then why copper contacts are silver-plated?

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Materials having resistivity ranging from 1 to 100 ohm. cm is termed as (A) Conductor (B) Insulator (C) Semi-conductor (D) None of these

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Last Answer : (A) Permanent magnets.

Czochralski method is widely used for the growth of crystal of -------------materials. a) Conductors b) semiconductors c) insulator d) conductors & insulators

Description : Czochralski method is widely used for the growth of crystal of -------------materials. a) Conductors b) semiconductors c) insulator d) conductors & insulators

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If electrical conductivity increases with the increase of temperature of a substance, then it is a: (1) Conductor (2) Semiconductor (3) Insulator (4) Carborator

Description : If electrical conductivity increases with the increase of temperature of a substance, then it is a: (1) Conductor (2) Semiconductor (3) Insulator (4) Carborator

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If electrical conductivity increases with the increase of temperature of a substance, then it is a (1) Conductor (2) Semiconductor (3) Insulator (4) Carborator

Description : If electrical conductivity increases with the increase of temperature of a substance, then it is a (1) Conductor (2) Semiconductor (3) Insulator (4) Carborator

Last Answer : (2) Semiconductor Explanation: A solid substance that has conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects.

Diamond is a good thermal conductor. But it is an excellent electrical insulator. How?

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Last Answer : (D) Both (B) & (C)

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Last Answer : (B) Cracking of rubber products