Electronics and Communication Engineering - Exam Questions Papers

26. 

What will be equipotential surfaces for a pair of equal and opposite line charges?

A. Spheres
B. Concentric cylinders
C. Non-concentric cylinders
D. None of the above

Answer: Option C

Explanation:

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27. 

With respect to the differential amplifier configuration shown below, the differential gain Ad will be

Rc = 4.7 KΩ
RE = 2.7 KΩ
hfe = 100
hie = 1 KΩ
RS = 100 Ω

A. 273.63
B. 213.63
C. 113.63
D. 233.63

Answer: Option B

Explanation:


28. 

A memory system of size 16 K bytes is required to be designed using memory chips having 12 address lines and 4 data lines-each. The number of such chips required to design and the memory system is :

A. 2
B. 4
C. 8
D. 16

Answer: Option C

Explanation:

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29. 

The measured transconductance gm of an NMOS transistor operating in the linear region is plotted against the gate voltage VG at constant drain voltage VD. Which of the following figures represents the expected dependance of gm on VG?

A.
B.
C.
D.

Answer: Option C

Explanation:

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30. 

In the graph shown in the figure, for the tree with branches b, d and f the fundamental loops would include c

A. abf, def, bdea
B. bdc, def, fba
C. abde, def, cdb
D. cea, bdea, abbf

Answer: Option B

Explanation:

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