The crystal of alpha iron is

The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is

A

770°C

B

910°C

C

1050°C

D

Below recrystallization temperature

Paramagnetic alpha iron changes to gamma iron at

A

770°C

B

912°C

C

1440°C

D

1539°C

Quartz crystal is most commonly used in crystal oscillators because ___________

A

It has superior electrical properties

B

It is easily available

C

It is quite inexpensive

D

None of the above

The crystal oscillator frequency is very stable due to ___________ of the crystal

A

Rigidity

B

Vibrations

C

Low Q

D

High Q

If the crystal frequency changes with temperature, we say that crystal has ___________ temperature coefficient

A

Positive

B

Zero

C

Negative

D

None of the above

Ferromagnetic alpha iron exists in temperature range of

A

Below 723°C

B

770 to 910°C

C

910 to 1440°C

D

1400 to 1539°C

Alpha iron is stable __________ °C.

A

Above 1403

B

Upto 910

C

Above 1800

D

Between 910 & 1403

The type of space lattice found in alpha-iron is

A

Face centered cubic space lattice

B

Body centered cubic space lattice

C

Close packed hexagonal space lattice

D

None of these

The crystal structure of gamma iron is

A

Body centered cubic

B

Face centered cubic

C

Hexagonal close packed

D

Cubic structure

Iron is a useful metal. Here iron is

A

an adjective

B

a noun

C

an adverb

D

a verb

The crystal of alpha iron is

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