MCQOPTIONS
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MCQOPTIONS
This section includes 34 Mcqs, each offering curated multiple-choice questions to sharpen your Alternating Current and Voltage knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Five 100 ohm resistors are connected in parallel. If one resistor is removed, the total resistance is |
| A. | 500 ohm |
| B. | 25 ohm |
| C. | 100 ohm |
| D. | 20 ohm |
| Answer» C. 100 ohm | |
| 2. |
What is the total resistance of a 45 ohm and a 36 ohm resistor inparallel? |
| A. | 20 ohms |
| B. | 9 ohms |
| C. | 81 ohms |
| D. | 40 .5 ohms |
| Answer» B. 9 ohms | |
| 3. |
What is the total voltage available when :-three 12-vc1t,2-amp batteriesare connected in parallel? |
| A. | 12 volts |
| B. | 4 volts |
| C. | 36 volts |
| D. | 24 volts |
| Answer» B. 4 volts | |
| 4. |
If three 4 k ohm resistors were connected in parallel with four parallel3 k ohm resistors, what would be the total resistance? |
| A. | 480 ohms |
| B. | 240 ohms |
| C. | 24 k ohms |
| D. | 6 k ohms |
| Answer» B. 240 ohms | |
| 5. |
If a resistor is added in parallel to a working circuit, the totalresistance will : |
| A. | decrease |
| B. | increase |
| C. | cannot tell |
| D. | remain the same |
| Answer» B. increase | |
| 6. |
Which is considered as the common reference for a parallel circuit, |
| A. | power |
| B. | current |
| C. | voltage |
| D. | resistance |
| Answer» D. resistance | |
| 7. |
What is the total resistance of a 154 ohm resistor and a 42 ohm resistorconnected in parallel? |
| A. | 38 ohms |
| B. | 33 ohms |
| C. | 198 ohms |
| D. | 96 ohms |
| Answer» C. 198 ohms | |
| 8. |
Parallel connected components form : |
| A. | open circuits |
| B. | branches |
| C. | a voltage divider |
| D. | short circuits |
| Answer» C. a voltage divider | |
| 9. |
What is Rt for parallel connected 1 .8 k ohm, 2 .1 k ohm, and 2 .8 k ohmresistors? |
| A. | 720 ohms |
| B. | 670 ohms |
| C. | 6 .7 k ohms |
| D. | 2 .23 k ohms |
| Answer» B. 670 ohms | |
| 10. |
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 tha |
| A. | R1 is open |
| B. | R3 is open |
| C. | the circuit is operating properly |
| D. | R2 is open |
| Answer» C. the circuit is operating properly | |
| 11. |
Which formula is correct for a circuit with two resistors, R.1 and R2,in parallel? |
| A. | Rt = R1 R2 |
| B. | It = Il 12 |
| C. | Vt = 1/V1 1/V2 |
| D. | Vt = V1 V2 |
| Answer» C. Vt = 1/V1 1/V2 | |
| 12. |
The total resistance of a parallel circuit is 50 ohm . If the total current is 120 mA, the current through the 270 ohm resistor that makes up part of the parallel circuit is approximately |
| A. | 120 mA |
| B. | 22 mA |
| C. | 50 mA |
| D. | 220 mA |
| Answer» C. 50 mA | |
| 13. |
A parallel circuit differs from a series circuit in that a parallelcircuit has : |
| A. | fewer paths for current flow |
| B. | no path for current flow |
| C. | more than one path for current flow |
| D. | one path for current flow |
| Answer» D. one path for current flow | |
| 14. |
What is the power loss of a 100 ohm resistor that develops 5 V acrossit? |
| A. | 250 mW |
| B. | 5 0 mW |
| C. | 500 W |
| D. | 500 mW |
| Answer» B. 5 0 mW | |
| 15. |
What is R T 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 | |
| 16. |
What is R T 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 | |
| 17. |
What are the individual values of two parallel resistors whose R T 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. | |
| 18. |
What is the total power loss if 2 k and 1 k parallel-connected resistors have an I T of 3 mA? |
| A. | 6 W |
| B. | 36 W |
| C. | 6 mW |
| D. | 36 mW |
| Answer» D. 36 mW | |
| 19. |
Six resistors are in parallel. The two lowest-value resistors are both 1.2 k . The total resistance |
| A. | is less than 6 k |
| B. | is greater than 1.2 k |
| C. | is less than 1.2 k |
| D. | is less than 600 |
| Answer» E. | |
| 20. |
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 | |
| 21. |
Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2 R , the third resistor 3 R , and the fourth resistor 4 R , the total current in the circuit is |
| A. | 60 mA |
| B. | 15 mA |
| C. | 135 mA |
| D. | 31.25 mA |
| Answer» E. | |
| 22. |
Three 47 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. | |
| 23. |
In a certain three-branch parallel circuit, R 1 has 12 mA through it, R 2 has 15 mA through it, and R 3 has 25 mA through it. After measuring a total of 27 mA, you can say that |
| A. | R 3 is open |
| B. | R 1 is open |
| C. | R 2 is open |
| D. | the circuit is operating properly |
| Answer» B. R 1 is open | |
| 24. |
Five 100 resistors are connected in parallel. If one resistor is removed, the total resistance is |
| A. | 25 |
| B. | 500 |
| C. | 100 |
| D. | 20 |
| Answer» B. 500 | |
| 25. |
Four 8 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. | |
| 26. |
A 470 resistor, a 220 resistor, and a 100 resistor are all in parallel. The total resistance is approximately |
| A. | 790 |
| B. | 470 |
| C. | 60 |
| D. | 30 |
| Answer» D. 30 | |
| 27. |
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 | |
| 28. |
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. | |
| 29. |
Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is |
| A. | 12.5 |
| B. | 200 |
| C. | 20 K |
| D. | 50 |
| Answer» D. 50 | |
| 30. |
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. | |
| 31. |
When a 1.6 k resistor and a 120 resistor are connected in parallel, the total resistance is |
| A. | greater than 1.6 k |
| B. | greater than 120 but less than 1.6 k |
| C. | less than 120 but greater than 100 |
| D. | less than 100 |
| Answer» D. less than 100 | |
| 32. |
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 | |
| 33. |
The total resistance of a parallel circuit is 50 . If the total current is 120 mA, the current through the 270 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 | |
| 34. |
An ammeter has an internal resistance of 50 . The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, R SH1 , is approximately |
| A. | 55 |
| B. | 5.5 |
| C. | 50 |
| D. | 9 |
| Answer» C. 50 | |