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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 8
21.
The time constant of the network shown in figure is
2 RC
5/3 RC
RC/2
None of these
Answer: Option
Explanation:

Req = (R || 2R) + R

.

22.
For the 8085 assembly language program given below, the content of the accumulator after the execution of the program is
00H
45H
67H
E7H
Answer: Option
Explanation:

A → 0100 0101

B → 0100 0101

Carry flag → 0

RAR will A → 0010 0010

XRA B 0110 0111

67.

23.
Consider the following BJT circuit:
hie = 2 k ohm
hfe = 100
hre = 2.5 x 10-4

The value of Ri is :
2.46 kΩ
2.88 kΩ
200 Ω
18.48 Ω
Answer: Option
Explanation:

Ri = 7 || 4.3 || (2 + (1 + 100)330) = 2.88 kΩ.

24.
One of a loss-less transmission line having the characteristic impedance of 75 Ω and length of 1cm is short-circuit. At 3 GHz, the input impedance at the other end of the transmission line is
0
resistive
capacitance
inductive
Answer: Option
Explanation:

X = 10 cm, ZL = 0, βl =

Thus Zin is Z0which is inductive.

25.
. The signal is __________ .
periodic for t > 0
non-periodic
periodic for t < 0
depends on t
Answer: Option
Explanation:

for

∴ for periodicity should be a rational number.

But our case not a rational number.

Hence non periodic.

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