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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 6
1.
The three sides of an admittance triangle denote
G, B, Y
R, X, Y
G, B, Z
(R, Y, Z) or (R, X, Z)
Answer: Option
Explanation:

Admittance triangle depicts admittance Y and its components G and B.

2.
A step voltage E is applied to an R-L series circuit. At t = 0, the current in the circuit is
E/R
E/L
infinity
zero
Answer: Option
Explanation:

Inductance does not allow the current to increase instantaneously.

3.
To find current in a resistance connected in a network, Thevenin's theorem is used VTH = 20 V and RTH = 5 Ω. The current through the resistance
is 4 A
is 4 A or less
is less than 4 A
may be 4 A or less or more than 4 A
Answer: Option
Explanation:

4.
In figure, the magnitude of V
must be more than that of Va
must be more than that of Vb
must be more than that of Va or Vb
can be equal to or less than or more than that of Va or Vb
Answer: Option
Explanation:

V depends on magnitudes and phase angles of Va and Vb.

5.
A step voltage E is applied to a series R-L circuit. The rate of change of current is maximum at t =
zero
infinity
L/R
R/L
Answer: Option
Explanation:

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