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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 2
6.
In the given circuit, viewed from AB, the circuit can be reduced to an equivalent circuit as
5 volts source in series with 10 Ω resistor
7 volts source in series with 2.4 Ω resistor
15 volts source in series with 2.4 Ω resistor
1 volt source in series with 10 Ω resistor
Answer: Option
Explanation:

For RTh, Voltage source will be short circuited RTh = 2.4 Ω,

VAB = 10 - 6 I 7 V.

7.
For the network of figure KVL for first loop is
Answer: Option
Explanation:

M term is negative because i1, is entering the dotted terminal and i2, is leaving the dotted terminal.

8.
An RC series circuit is charged by a voltage E. After a long time the battery is removed and a short circuit is placed across R-C. Then
the polarity of voltage across R is same during discharge and during charge
the polarity of voltage across R during discharging is opposite to that during charging
the polarity of voltage across R depends on time constant RC
none of the above
Answer: Option
Explanation:

Direction of current during discharging is opposite to that during charging.

9.
Two coils having self inductances of 10 mH and 40 mH are mutually coupled. The maximum possible mutual inductance is
40 mH
20 mH
10 mH
5 mH
Answer: Option
Explanation:

Maximum mutual inductance = L1L2 = 20 mH.

10.
In the circuit shown in figure the current I of sinusoidal source is
25 A
4 A
20 A
Not determinable from given data
Answer: Option
Explanation:

Currents in resistance and inductance are out of phase by 90°. Hence I = 122 + 162 = 20 A.

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