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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 11
26.
In the circuit of figure
Va would always lag Vb
Va would always lead Vb
Va and Vb would always be in phase
Va may lag or lead Vb
Answer: Option
Explanation:

Voltage across inductance leads the current and voltage across resistance is in phase with the current.

27.
Two capacitors of 16 μF each are connected in series. Another capacitor of 16 μF is connected in parallel with this combination. The total capacitance will be
48 μF
32 μF
24 μF
Answer: Option
Explanation:

28.

Assertion (A): Operator has a value 1 ∠ - 90° or 1 ∠ 90°.

Reason (R): Operator 'a' has a value 1 ∠ 120°.

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:

j = 1∠90°.

29.
The maximum current and voltage ratings for a 0.5 W, 10 kW resistor are
7.07 mA and 70.7 V
70.7 mA and 70.7 V
0.707 mA and 70.7 V
7.07 mA and 70.7 x 103 V
Answer: Option
Explanation:

.

30.
Figure shows a pole zero plot of I(s). The likely current response in time domain is
i (t) = e-1 - e-3t
i (t) = e-1 - 2e-2t
i (t) = e-1 - e-2t
i (t) = e-1 - e-4t
Answer: Option
Explanation:

Therefore , i(t) = -e-t + 2e-2t

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