MCQOPTIONS
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MCQOPTIONS
This section includes 36 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A 240 H inductor is equivalent to a |
| A. | 0.240 mH inductor |
| B. | 0.000240 mH inductor |
| C. | 240 mH inductor |
| D. | 240 H inductor |
| Answer» B. 0.000240 mH inductor | |
| 2. |
The voltage across a coil when = 20 mA/s and = 8 H is |
| A. | 16 mV |
| B. | 160 mV |
| C. | 1.6 mV |
| D. | 2.5 mV |
| Answer» C. 1.6 mV | |
| 3. |
An inductance of 0.08 H is larger than |
| A. | 0.0000008 H |
| B. | 0.000000008 H |
| C. | 0.000008 H |
| D. | 0.00008 mH |
| Answer» C. 0.000008 H | |
| 4. |
Two inductors, and , are in parallel. has a value of 25 H and a value of 50 H. The parallel combination is in series with , a 20 H coil. The entire combination is across an ac source of 60 V at 300 kHz. The total rms current is |
| A. | 87 mA |
| B. | 870 mA |
| C. | 87 A |
| D. | 337 mA |
| Answer» C. 87 A | |
| 5. |
An inductor, a 1 k resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is |
| A. | 0 V |
| B. | 6 V |
| C. | 12 V |
| D. | 4 V |
| Answer» C. 12 V | |
| 6. |
An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is |
| A. | 1 mA |
| B. | 10 mA |
| C. | 100 mA |
| D. | 1 A |
| Answer» D. 1 A | |
| 7. |
A switch, a 220 resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed? |
| A. | 91 mA |
| B. | 78 mA |
| C. | 57 mA |
| D. | 400 mA |
| Answer» C. 57 mA | |
| 8. |
A 320 H coil is in series with a 3.3 k resistor. How long does it take for current to build up to its full value? |
| A. | 0.48 s |
| B. | 0.48 ms |
| C. | 0.48 |
| D. | s |
| E. | 48 s |
| Answer» D. s | |
| 9. |
Five inductors are connected in series. The lowest value is 8 μH. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is |
| A. | 8 H |
| B. | 32 μH |
| C. | 64 μH |
| D. | 248 μH |
| Answer» E. | |
| 10. |
is directly proportional to frequency and inductance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
An induced voltage is produced as a result of a dc voltage. |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
Inductance is the property of an inductor that produces an opposition to any change in current. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core. |
| A. | True |
| B. | False |
| Answer» C. | |
| 14. |
Inductors add in parallel. |
| A. | True |
| B. | False |
| Answer» C. | |
| 15. |
Energy is stored by an inductor in an electrostatic field. |
| A. | True |
| B. | False |
| Answer» C. | |
| 16. |
The term is more commonly used in connection with an inductor used to block off high frequencies. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 17. |
All coil cores are made of iron. |
| A. | True |
| B. | False |
| Answer» C. | |
| 18. |
Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals? |
| A. | 219 k |
| B. | 66 k |
| C. | 660 k |
| D. | 1.3 M |
| Answer» D. 1.3 M | |
| 19. |
When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field |
| A. | is quartered |
| B. | quadruples |
| C. | doubles |
| D. | does not change |
| Answer» B. quadruples | |
| 20. |
An inductance of 0.43 mH is smaller than |
| A. | 43 H |
| B. | 430 H |
| C. | 0.05 H |
| D. | 0.00043 H |
| Answer» D. 0.00043 H | |
| 21. |
The following coils are in parallel: 75 H, 40 H, 25 H, and 15 H. The total inductance is approximately |
| A. | 6.9 H |
| B. | 14 H |
| C. | 2.2 H |
| D. | 155 H |
| Answer» B. 14 H | |
| 22. |
An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then |
| A. | VR ‚â• VL |
| B. | VL < VR |
| C. | VL = VR |
| D. | VL > VR |
| Answer» E. | |
| 23. |
When the current through an inductor decreases, the amount of energy stored in the electromagnetic field |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | doubles |
| Answer» C. remains the same | |
| 24. |
Faraday's law states that relative motion between a magnetic field and a coil induces a voltage across the coil. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 25. |
Five inductors are connected in series. The lowest value is 8 μH. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is |
| A. | 8 H |
| B. | 32 μH |
| C. | 64 μH |
| D. | 248 μH |
| Answer» E. | |
| 26. |
A switch, a 220 resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed? |
| A. | 91 mA |
| B. | 78 mA |
| C. | 57 mA |
| D. | 400 mA |
| Answer» C. 57 mA | |
| 27. |
The inductance of an iron-core coil decreases if |
| A. | the number of turns is decreased |
| B. | the iron core is removed |
| C. | the length of the coil decreases |
| D. | none of the above |
| Answer» B. the iron core is removed | |
| 28. |
Three 15 mH inductors are in series. The total inductance is |
| A. | 15 mH |
| B. | 30 mH |
| C. | 45 mH |
| D. | 5 mH |
| Answer» D. 5 mH | |
| 29. |
A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is |
| A. | 9.9 mH |
| B. | greater than 5 mH |
| C. | 9.9 mH or greater than 5 mH |
| D. | less than 0.6 mH |
| Answer» E. | |
| 30. |
The winding resistance of a coil can be increased by |
| A. | increasing the number of turns |
| B. | using a thinner wire |
| C. | changing the core material |
| D. | increasing the number of turns or using thinner wire |
| Answer» E. | |
| 31. |
The voltage across a coil when di/dt = 20 mA/s and L = 8 H is |
| A. | 16 mV |
| B. | 160 mV |
| C. | 1.6 mV |
| D. | 2.5 mV |
| Answer» C. 1.6 mV | |
| 32. |
The permeability of a core material is an indication of the ability of the material to establish a magnetic field. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 33. |
A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is |
| A. | 55 mH |
| B. | less than 0.2 mH |
| C. | less than 5.5 mH |
| D. | 5.5 mH |
| Answer» E. | |
| 34. |
A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current |
| A. | is increased |
| B. | is decreased |
| C. | does not change |
| D. | momentarily goes to zero |
| Answer» B. is decreased | |
| 35. |
A 240 H inductor is equivalent to a |
| A. | 0.240 mH inductor |
| B. | 0.000240 mH inductor |
| C. | 240 mH inductor |
| D. | 240 H inductor |
| Answer» B. 0.000240 mH inductor | |
| 36. |
An inductance of 0.08 H is larger than |
| A. | 0.0000008 H |
| B. | 0.000000008 H |
| C. | 0.000008 H |
| D. | 0.00008 mH |
| Answer» C. 0.000008 H | |