Electronics and Communication Engineering - Electronic Devices and Circuits

31. 

When a ferromagnetic substance is magnetised, there are small changes in its dimensions. This phenomenon is called

A. hysteresis
B. magnetostriction
C. diamagnetism
D. bipolar relaxation

Answer: Option B

Explanation:

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32. 

Gold is often diffused into silicon PN junction devices to

A. increase the recombination rate
B. reduce the recombination rate
C. make silicon a direct gap semiconductor
D. make silicon semimetal

Answer: Option C

Explanation:

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33. 

In the figure shows the circuits symbol of

A. FET
B. PMOSFET
C. CMOSFET
D. NMOSFET

Answer: Option D

Explanation:

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34. 

Assertion (A): FET is a unipolar device.

Reason (R): BJT is bipolar device.

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option B

Explanation:

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35. 

Ferrites are

A. ferromagnetic materials
B. ferrimagnetic materials
C. ferroelectric materials
D. ferri-ferromagnetic materials

Answer: Option A

Explanation:

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