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Materials and Components

Materials and Components
The materials which become polarized on the application of mechanical stress are called piezoelectric.

False
True

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Materials and Components
Which inductor is used at high frequencies?

Iron alloy cored
Ceramic cored
Cast iron cored
Sheet steel cored

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Materials and Components
As the atoms of rare gases become larger, electronic polarizability

May increase or decrease
Increases
Remains the same
Decreases

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Materials and Components
Which of the following are true for relative dielectric constant?1. It is dimensionless.2. It is equal to 1 for vacuum.3. It is equal to 1 for all substances.

2 and 3 only
1, 2 and 3
1 and 2 only
1 and 3 only

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Materials and Components
A vacant electronic state moves in the same direction as would a positive charge carrier.

True
False

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Materials and Components
The most important set of specifications of transformer oil include

flash point and viscosity
viscosity and flash point
dielectric strength and flash point
dielectric strength and viscosity

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