Circuit Theorems and Conversions Objective Questions - ObjectiveBooks

# Practice Test: Question Set - 03

1. Referring to the given circuit, determine VTH and RTH if a 68 Ω resistor is connected in parallel across R2 and R3.

(A) 3.3 V, 148 Ω
(B) 330 mV, 148 Ω
(C) 3.3 V, 68 Ω
(D) 330 mV, 68 Ω

2. A certain voltage source has the values VS = 30 V and RS = 6 Ω. The values for an equivalent current source are
(A) 5 A, 6 Ω
(B) 30 A, 6 Ω
(C) 5 A, 30 Ω
(D) 30 A, 5 Ω

3. Transistors act basically as voltage sources.
(A) True
(B) False

4. Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given below.

(A) 4.16 V, 120 Ω
(B) 41.6 V, 120 Ω
(C) 4.16 V, 70 Ω
(D) 41.67 V, 70 Ω

5. A practical current source has a finite internal resistance.
(A) True
(B) False

6. A 12 V source has an internal resistance of 90 Ω. If a load resistance of 20 Ω is connected to the voltage source, the load power, PL, is
(A) 2.38 mW
(B) 2.38 W
(C) 238 mW
(D) 23.8 W

7. Find RN for the circuit given.

(A) 34 Ω
(B) 68 Ω
(C) 120 Ω
(D) 154 Ω

8. A 680 Ω load resistor, RL, is connected across a constant current source of 1.2 A. The internal source resistance, RS, is 12 kΩ. The load current, RL, is
(A) 0 A
(B) 1.2 A
(C) 114 mA
(D) 1.14 A

9. What is the Thevenin equivalent (VTH and RTH) for the circuit given?

(A) 6.4 V, 422 Ω
(B) 6.4 V, 560 Ω
(C) 6.4 V, 680 Ω
(D) 30 V, 422 Ω

10. An 18 V source has an internal resistance of 70 Ω. If a load resistance of 33 Ω is connected to the voltage source, the load power, PL, is
(A) 0 W
(B) 1 W
(C) 175 mW
(D) 18 mW

11. Find the total current through R3 in the given circuit.

(A) 7.3 mA
(B) 5.5 mA
(C) 12.8 mA
(D) 1.8 mA

12. Find the current through R2 of the given circuit.

(A) 30.7 mA
(B) 104 mA
(C) 74 mA
(D) 134 mA

13. A 120 V voltage source has a source resistance, RS, of 60 Ω. The equivalent current source is
(A) 2 A
(B) 4 A
(C) 200 mA
(D) 400 mA

14. Find the current through R1 in the given circuit.

(A) 0.16 A
(B) 0.24 A
(C) 0.2 A
(D) 0.04 A

15. A 120 Ω load is connected across a voltage source with VS = 12 V and RS = 8 Ω. The voltage across the load is
(A) 11.25 V
(B) 0 V
(C) 12 V
(D) 1.13 V

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