Circuit Theorems and Conversions MCQs

Question 1

A 470 Ω RL is connected across a voltage source, VS, of 120 V. The source's internal resistance, RS, is 12 Ω. What is the output voltage across the load?

Accepted Answer

117 V

Answer

120 V

Answer

0 V

Answer

12 V

Question 2

Conversions between delta-type and wye-type circuit arrangements are useful in certain specialized applications.

Accepted Answer

True

Answer

False

Question 3

Find the Norton circuit, that is, IIN and RN, for the circuit given below.

Accepted Answer

478 mA, 12.8 Ω

Answer

750 mA, 12.8 Ω

Answer

478 mA, 6.8 Ω

Answer

750 mA, 6.8 Ω

Question 4

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

Accepted Answer

41.67 V, 70 Ω

Answer

4.16 V, 120 Ω

Answer

41.6 V, 120 Ω

Answer

4.16 V, 70 Ω

Question 5

Referring to circuit given, if R1 is changed to a 68 Ω resistor, what will be the current through it?

Accepted Answer

0.16 A

Answer

0.24 A

Answer

0.2 A

Answer

0.04 A

Question 6

A 120 Ω load is connected across an ideal voltage source with VS = 12 V. The voltage across the load is

Accepted Answer

12 V

Answer

0 V

Answer

120 V

Answer

Cannot be determined

Question 7

A 120 Ω load is connected across a voltage source with VS = 12 V and RS = 8 Ω. The voltage across the load is

Accepted Answer

11.25 V

Answer

0 V

Answer

12 V

Answer

1.13 V

Question 8

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

Accepted Answer

238 mW

Answer

2.38 mW

Answer

2.38 W

Answer

23.8 W

Question 9

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

Accepted Answer

1 W

Answer

0 W

Answer

175 mW

Answer

18 mW