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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 7
31.
Magnetic effect of current is used in generators but not in motors.
True
False
Answer: Option
Explanation:

Magnetic effect of current is used in both generators and motors.

32.
For a nonlinear resistance
v-i plot is not a straight line
resistance increases as current increases
resistance decreases as current increases
current decreases as voltage increases
Answer: Option
Explanation:

In a non-linear resistance v-i graph is a curve.

33.
The Z parameters Z11 and Z21 for the 2-port network in the figure.
Z11 = - 6/11Ω; Z21 = 16/11Ω
Z11 = 6/11Ω; Z21 = 4/11Ω
Z11 = 6/11Ω; Z21 = - 16/11Ω
Z11 = 4/11Ω; Z21 = 4/11Ω
Answer: Option
Explanation:

Apply mesh analysis in both loop

11E1 = 6I1 + 4I2, E2 + 10 E1 = 4 (I1 + I2)

Z21 .

34.
For the wave shown in figure, the average value is
7.07 A
5 A
2.5 A
0.5 A
Answer: Option
Explanation:

Since area of triangle is half of the rectangle enclosing it, average value = 0.5 x peak value.

35.

Assertion (A): For a physically realisable driving point function, the degree of numerator and denominator should be equal.

Reason (R): The sum of positive real functions is real.

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:

The degrees can differ by a maximum of 1.

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