Circuit Theorems and Conversions Objective Questions

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.
ob-ele-ct-05


    (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.
ob-ele-ct-06


    (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. 
ob-ele-ct-04


    (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. 
ob-ele-ct-02


    (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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Item Reviewed: Circuit Theorems and Conversions Objective Questions Rating: 5 Reviewed By: Pranab Debnath
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