# Practice Test: Question Set - 03

**1. Referring to the given circuit, determine**

*V*_{TH}and*R*_{TH}if a 68 Ω resistor is connected in parallel across*R*_{2}and*R*_{3}.- (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**

*V*_{S}= 30 V and*R*_{S}= 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 (**

*V*_{TH}and*R*_{TH}) 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,**

*P*, is_{L}- (A) 2.38 mW

- (B) 2.38 W

- (C) 238 mW

- (D) 23.8 W

**7. Find**

*R*_{N}for the circuit given.- (A) 34 Ω

- (B) 68 Ω

- (C) 120 Ω

- (D) 154 Ω

**8. A 680 Ω load resistor,**

*R*, is connected across a constant current source of 1.2 A. The internal source resistance,_{L}*R*_{S}, is 12 kΩ. The load current,*R*, is_{L}- (A) 0 A

- (B) 1.2 A

- (C) 114 mA

- (D) 1.14 A

**9. What is the Thevenin equivalent (**

*V*_{TH}and*R*_{TH}) 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,**

*P*, is_{L}- (A) 0 W

- (B) 1 W

- (C) 175
mW

- (D) 18
mW

**11. Find the total current through**

*R*_{3}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**

*R*_{2}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,**

*R*_{S}, 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**

*R*_{1}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**

*V*_{S}= 12 V and*R*_{S}= 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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