# Electronics and Communication Engineering - Electronic Devices and Circuits

21.

Which rectifier has the best ratio of rectification?

 A. Half wave rectifier B. Full wave rectifier C. Bridge rectifier D. Three phase full wave rectifier

Explanation:

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22.

Assertion (A): A p-n junction is used as rectifier.

Reason (R): A p-n junction has low resistance in forward direction and high resistance in reverse direction.

 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

Explanation:

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23.

In an integrated circuit the SiO2 layers provide

 A. electrical connection to external Ckt. B. physical strength C. isolation D. conducting path.

Explanation:

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24.

For a n-channel JFET with r0 = 10 kW, (VGs= 0 V, VP = - 6 V)the drain resistance rd at VGS= - 3 V is given by

 A. 40 kΩ B. 2.5 kΩ C. 4.44 kW D. 120 kW

Explanation:

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25.

Which of the following are voltage controlled devices?

 A. Vacum triode B. FET C. SCR D. Both (a) and (b)