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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 3
41.

Assertion (A): The function is not positive real.

Reason (R): The degrees of numerator and denominator differ by 2

Both A and R are true and R is correct explanation of A
Both A and R are true and R is not the correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:

If degrees of numerator and denominator differ by more than 1, the function is not positive real.

42.
Two sinusoidal voltage sources v1 = 50 sin (100t) and v1 = 50 sin (100t + p) are connected in parallel and fed an inductance XL = 2Ω. The cuirent through XL is
25 A
about 17.5 A
zero
50 A
Answer: Option
Explanation:

Since voltages have a phase difference of 180°, current is zero.

43.
In figure, the current after a long time after closing of switch is
1 A
2 A
0
infinity
Answer: Option
Explanation:

At t = ∞ the circuit has effectively two 6Ω resistances in parallel.

44.
A system function , the system is at rest for t < 0. For i(t) = u(t), then v(t) is given by
1 - e-4t
e-4t
e4t
1 + e-4t
Answer: Option
Explanation:

.

45.
Two voltages 50 V each have a phase difference of 45°. The rms value of resultant sum of the two voltages is
70.7 V
80.4 V
92.4 V
100 V
Answer: Option
Explanation:

RMS value = (50 + 50 x 0.707)2 + (50 x .707)2.

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