MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 124 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If a 1 k and a 2 k resistor are parallel-connected across a 12 V supply, how much current is received by the 2 k resistor? |
| A. | 4 mA |
| B. | 6 mA |
| C. | 8 mA |
| D. | 12 mA |
| Answer» C. 8 mA | |
| 2. |
What is R for fifteen 2 M resistors all connected in parallel? |
| A. | 133 k |
| B. | 300 k |
| C. | 750 k |
| D. | 30 M |
| Answer» B. 300 k | |
| 3. |
What is R for a 12 k, a 4 k, and a 3 k resistor in parallel? |
| A. | 1.5 k |
| B. | 2 k |
| C. | 6.3 k |
| D. | 19 k |
| Answer» B. 2 k | |
| 4. |
What is the total resistance of four 1 k parallel-connected resistors? |
| A. | 200 ohms |
| B. | 250 ohms |
| C. | 400 ohms |
| D. | 4 kilohms |
| Answer» C. 400 ohms | |
| 5. |
When a parallel 5 k resistor and a 25 k resistor have a 10 V supply, what is the total power loss? |
| A. | 2.4 mW |
| B. | 3.3 mW |
| C. | 24 mW |
| D. | 33 mW |
| Answer» D. 33 mW | |
| 6. |
What are the individual values of two parallel resistors whose R is 8 ohms, when one has double the resistance of the other? |
| A. | 2.7 ohms and 5.3 ohms |
| B. | 8 ohms and 16 ohms |
| C. | 10 ohms and 20 ohms |
| D. | 12 ohms and 24 ohms |
| Answer» E. | |
| 7. |
The total resistance is 480 . |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
If R opens in the given circuit, the total current equals ___. |
| A. | 86 mA |
| B. | 170 mA |
| C. | 42 mA |
| D. | 128 mA |
| Answer» E. | |
| 9. |
Determine the phase angle in the circuit shown below. |
| A. | 56⁰ |
| B. | 56.5⁰ |
| C. | 57.5⁰ |
| D. | 57⁰ |
| Answer» D. 57⁰ | |
| 10. |
Find the impedance in the circuit shown below. |
| A. | 25 |
| B. | 26 |
| C. | 27 |
| D. | 28 |
| Answer» D. 28 | |
| 11. |
Find the phase angle θ in the circuit shown below. |
| A. | 20.5⁰ |
| B. | 20⁰ |
| C. | 19.5⁰ |
| D. | 19⁰ |
| Answer» B. 20⁰ | |
| 12. |
Find IT in the figure shown below. |
| A. | 0.66∠-20.5⁰ |
| B. | 0.66∠20.5⁰ |
| C. | 0.77∠20.5⁰ |
| D. | 0.77∠-20.5⁰ |
| Answer» E. | |
| 13. |
Determine Z in the figure shown below. |
| A. | 26∠-20.5⁰ |
| B. | 26∠20.5⁰ |
| C. | 25∠-20.5⁰ |
| D. | 25∠20.5⁰ |
| Answer» C. 25∠-20.5⁰ | |
| 14. |
Determine total impedance in the circuit shown below. |
| A. | 25∠-58.8⁰ |
| B. | 25∠-58.8⁰. |
| C. | 26∠-58.8⁰. |
| D. | 26∠58.8⁰. |
| Answer» D. 26∠58.8⁰. | |
| 15. |
A 50Ω resistor is connected in parallel with an inductive reactance of 30Ω. A 20V signal is applied to the circuit. Find the line current in the circuit. |
| A. | 0.77∠-58.8⁰ |
| B. | 0.77∠58.8⁰ |
| C. | 0.88∠-58.8⁰ |
| D. | 0.88∠58.8⁰ |
| Answer» B. 0.77∠58.8⁰ | |
| 16. |
Determine the total impedance in the circuit. |
| A. | 73.3∠33⁰ |
| B. | 83.3∠-33⁰ |
| C. | 83.3∠33⁰ |
| D. | 73.3∠-33⁰ |
| Answer» C. 83.3∠33⁰ | |
| 17. |
Find the phase angle in the circuit shown below. |
| A. | 31⁰ |
| B. | 32⁰ |
| C. | 33⁰ |
| D. | 34⁰ |
| Answer» D. 34⁰ | |
| 18. |
A signal generator supplies a sine wave of 20V, 5 kHz to the circuit as shown. Determine total current IT. |
| A. | 0.21∠33⁰ |
| B. | 0.22∠33⁰ |
| C. | 0.23∠33⁰ |
| D. | 0.24∠33⁰ |
| Answer» E. | |
| 19. |
The sum of the currents into a junction is equal to the sum of the currents out of that junction. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 20. |
A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 k. The current through each bulb is approximately |
| A. | 610 mA |
| B. | 18 mA |
| C. | 110 mA |
| D. | 61 mA |
| Answer» E. | |
| 21. |
Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately |
| A. | 2.2 A |
| B. | 137 mA |
| C. | 1.8 A |
| D. | 9.09 A |
| Answer» D. 9.09 A | |
| 22. |
A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 kΩ. The current through each bulb is approximately |
| A. | 610 mA |
| B. | 18 mA |
| C. | 110 mA |
| D. | 61 mA |
| Answer» E. | |
| 23. |
The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω resistor that makes up part of the parallel circuit is approximately |
| A. | 22 mA |
| B. | 120 mA |
| C. | 220 mA |
| D. | 50 mA |
| Answer» B. 120 mA | |
| 24. |
Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistance |
| A. | Is less than 6 kΩ |
| B. | Is greater than 1.2 kΩ |
| C. | Is less than 1.2 kΩ |
| D. | Is less than 600 Ω |
| Answer» E. | |
| 25. |
If one of the resistors in a parallel circuit is removed, the total resistance |
| A. | Decreases |
| B. | Increases |
| C. | Remains the same |
| D. | Doubles |
| Answer» C. Remains the same | |
| 26. |
When an additional resistor is connected across an existing parallel circuit, the total resistance |
| A. | Remains the same |
| B. | Decreases by the value of the added resistor |
| C. | Increases by the value of the added resistor |
| D. | Decreases |
| Answer» E. | |
| 27. |
Parallel resistors are connected between the same two points. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 28. |
The following resistors are in parallel across a voltage source: 220 Ω, 470 Ω, and 560 Ω. The resistor with the least current is |
| A. | 220 Ω |
| B. | 470 Ω |
| C. | 560 Ω |
| D. | Impossible to determine without knowing the voltage |
| Answer» D. Impossible to determine without knowing the voltage | |
| 29. |
The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is |
| A. | 1 A |
| B. | 7 A |
| C. | Unknown |
| D. | The larger of the two |
| Answer» C. Unknown | |
| 30. |
The number of current paths equals the number of resistors in parallel. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 31. |
A parallel circuit acts as a current divider. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 32. |
If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is |
| A. | 50 mA |
| B. | 70 mA |
| C. | 120 mA |
| D. | 40 mA |
| Answer» C. 120 mA | |
| 33. |
Three 47 Ω resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately |
| A. | 2.3 A |
| B. | 780 mA |
| C. | 47 mA |
| D. | 7.06 A |
| Answer» E. | |
| 34. |
The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is |
| A. | 1.2 W |
| B. | 4.8 W |
| C. | 0.3 W |
| D. | 12 W |
| Answer» C. 0.3 W | |
| 35. |
Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 Ω, the current through each parallel resistor is |
| A. | 25 mA |
| B. | 100 mA |
| C. | 6.25 mA |
| D. | 200 mA |
| Answer» D. 200 mA | |
| 36. |
Three lights are connected in parallel across a 120 volt source. If one light burns out, |
| A. | The remaining two will glow dimmer |
| B. | The remaining two will glow brighter |
| C. | The remaining two will not light |
| D. | The remaining two will glow with the same brightness as before |
| Answer» E. | |
| 37. |
The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is |
| A. | 200 mA |
| B. | 540 mA |
| C. | 1.24 A |
| D. | 900 mA |
| Answer» D. 900 mA | |
| 38. |
Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is |
| A. | 60 mA |
| B. | 15 mA |
| C. | 135 mA |
| D. | 31.25 mA |
| Answer» E. | |
| 39. |
Total power in a parallel circuit is found by adding up the power of all the individual resistors. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 40. |
A 470 Ω resistor, a 220 Ω resistor, and a 100 Ω resistor are all in parallel. The total resistance is approximately |
| A. | 790 Ω |
| B. | 470 Ω |
| C. | 60 Ω |
| D. | 30 Ω |
| Answer» D. 30 Ω | |
| 41. |
In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that |
| A. | R3 is open |
| B. | R1 is open |
| C. | R2 is open |
| D. | The circuit is operating properly |
| Answer» B. R1 is open | |
| 42. |
Four 8 Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers |
| A. | 18 W |
| B. | 1.5 W |
| C. | 48 W |
| D. | 72 W |
| Answer» E. | |
| 43. |
In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is |
| A. | 48 mA |
| B. | 12 mA |
| C. | 0 A |
| D. | 3 mA |
| Answer» C. 0 A | |
| 44. |
An ammeter has an internal resistance of 50 Ω. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately |
| A. | 55 Ω |
| B. | 5.5 Ω |
| C. | 50 Ω |
| D. | 9 Ω |
| Answer» C. 50 Ω | |
| 45. |
The total resistance for two resistors in parallel is equal to the sum of the two resistors. |
| A. | True |
| B. | False |
| Answer» C. | |
| 46. |
When an open circuit occurs in a parallel branch, the total resistance decreases. |
| A. | True |
| B. | False |
| Answer» C. | |
| 47. |
Addition of resistors in parallel increases total resistance and decreases total current. |
| A. | True |
| B. | False |
| Answer» C. | |
| 48. |
The total current divides among parallel resistors in a manner directly proportional to the resistance values. |
| A. | True |
| B. | False |
| Answer» C. | |
| 49. |
There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is |
| A. | 490 mA |
| B. | 800 mA |
| C. | 310 mA |
| D. | 0 A |
| Answer» B. 800 mA | |
| 50. |
A sudden increase in the total current into a parallel circuit may indicate |
| A. | A drop in source voltage |
| B. | An open resistor |
| C. | An increase in source voltage |
| D. | Either a drop in source voltage or an open resistor |
| Answer» D. Either a drop in source voltage or an open resistor | |