Electronics and Communication Engineering - Electronic Devices and Circuits

21. 

For generating 1 MHz frequency signal, the most suitable circuit is

A. phase shift oscillator
B. weinbridge oscillator
C. colpitt's oscillator
D. clapp oscillator

Answer: Option C

Explanation:

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22. 

A doped semi-conductor is called

A. impure semi-conductor
B. dipole semi-conductor
C. bipolar semi-conductor
D. extrinsic semi-conductor

Answer: Option D

Explanation:

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23. 

In n type MOSFET, the substrate

A. is p type
B. is n type
C. is metallic
D. may be p or n type

Answer: Option A

Explanation:

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24. 

The first and the last critical frequency of an RC driving point impedance function must respectively by

A. a zero and a pole
B. a zero and a zero
C. a pole and a pole
D. a pole and a zero

Answer: Option A

Explanation:

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25. 

The diffusion current is proportional to

A. applied electric field
B. concentration gradient of charge carrier
C. square of the electric field
D. cube of the applied electric field

Answer: Option B

Explanation:

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