# Electronic Devices and Circuits Questions and Answers – Network Theroms

This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Network Theroms”.

1. Find the value of Vth from the below circuit.

a) 1 V
b) 2 V
c) 3 V
d) 4 V

Explanation: Vth = (6)(6)/(6 + 3) or 4 V.

2. Find the value of Rth (in Ohm) from the below circuit.

a) 2
b) 3
c) 4
d) 5

Explanation: Rth = (3||6) + 2 or 4 ohm.

3. A battery has a short-circuit current of 30 A and an open circuit voltage of 24 V. If the battery is connected to an electric bulb of resistance 2 ohm-1, the power dissipated by the bulb is
a) 80 W
b) 1800 W
c) 112.5 W
d) 228 W

Explanation: r = Voc/Isc = 1.2 ohm
Power used by bulb = (24 x 24) x 2/(1.2 + 2) x (1.2 + 2) or 11.5 Watt.

4. In = ?

a) 1.5 A
b) 3 A
c) 6 A
d) 10 A

Explanation: V1 = (15/2)/(1/4 + 1/2 + 1/2)
In = Isc = V1/2 = 3 A.

5. Rn = ? (in ohm)

a) 10/3
b) 4
c) 6
d) 10

Explanation: Rn = (2||4) + 2.
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6. Vth = ?

a) -2 V
b) -1 V
c) 1 v
d) 2 V

Explanation: Vth = (2)(3)(1)/3+3 = 1V.

7. Rth = ? (in ohm)

a) 5/6
b) 6/5
c) 5/3
d) 3/5

Explanation: Rth = 1||5 or 5/6 ohm.

8. The equivalent to the given circuit is

a)

b)

c)

d)

Explanation: After killing all source equivalent resistance is R. Open circuit voltage is v1.

9. V1 = ?

a) 6 V
b) 7 V
c) 8 V
d) 10 V

Explanation:

10. i1 = ?

a) 3 A
b) 0.75 mA
c) 2 mA
d) 1.75 mA

Explanation:

Sanfoundry Global Education & Learning Series – Electronic Devices and Circuits.

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