MCQOPTIONS
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MCQOPTIONS
This section includes 45 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. |
Find the time taken for the current in an inductor to change to 2A from 0A if the power in the inductor is 5W. The value of inductance is 10H. |
| A. | 1s |
| B. | 2s |
| C. | 3s |
| D. | 4s |
| Answer» E. | |
| 2. |
If the current in one coil becomes steady, the current in neighbouring coil is? |
| A. | Zero |
| B. | Infinity |
| C. | Doubles |
| D. | Halves |
| Answer» B. Infinity | |
| 3. |
Calculate the value of emf in an inductor if the value of inductance is 15H and an average current of 5A flows through it in 10s. |
| A. | 15V |
| B. | 7.5V |
| C. | 10V |
| D. | 5.5V |
| Answer» C. 10V | |
| 4. |
Calculate the current in an inductor if the energy stored is 160J and the inductance is 20H. |
| A. | 1A |
| B. | 2A |
| C. | 3A |
| D. | 4A |
| Answer» E. | |
| 5. |
Practical application of mutual inductance is ____________ |
| A. | DC generator |
| B. | AC generator |
| C. | Transformer |
| D. | Capacitor |
| Answer» D. Capacitor | |
| 6. |
The flux linkage in coil 1 is 3Wb and it has x turns and the current in coil 2 is 2A, calculate the value of x if the mutual inductance is 750H. |
| A. | 300 |
| B. | 400 |
| C. | 500 |
| D. | 700 |
| Answer» D. 700 | |
| 7. |
If the flux linkage in coil 1 is 3Wb and it has 500 turns and the current in coil 2 is 2A, calculate the mutual inductance. |
| A. | 750H |
| B. | 500H |
| C. | 450H |
| D. | 900H |
| Answer» B. 500H | |
| 8. |
The flux linkage in coil 1 is x and it has 500 turns and the current in coil 2 is 2A, calculate the value of x if the mutual inductance is 750H. |
| A. | 1Wb |
| B. | 2Wb |
| C. | 3Wb |
| D. | 4Wb |
| Answer» D. 4Wb | |
| 9. |
The flux linkage in coil 1 is 3 Wb and it has 500 turns and the current in coil 2 is xA, calculate the value of x if the mutual inductance is 750H. |
| A. | 1A |
| B. | 2A |
| C. | 3A |
| D. | 4A |
| Answer» C. 3A | |
| 10. |
The types of inductors are ____________ |
| A. | Fixed and variable |
| B. | Only fixed |
| C. | Only variable |
| D. | Neither fixed nor variable |
| Answer» B. Only fixed | |
| 11. |
A coil has a resistance of 4 ohms and an inductance of 2H. It is connected to a 20V dc supply. Calculate the initial value of the current in the circuit. |
| A. | 5A |
| B. | 10A |
| C. | 0 A |
| D. | 20A |
| Answer» D. 20A | |
| 12. |
A coil has a resistance of 4 ohms and an inductance of 2H. It is connected to a 20V dc supply. Calculate the value of voltage 1s after the switch is closed. |
| A. | 5.4V |
| B. | 10.8V |
| C. | 0 V |
| D. | 2.7V |
| Answer» E. | |
| 13. |
The charging time constant of a circuit consisting of an inductor is the time taken for the current in the inductor to become __________% of the initial current. |
| A. | 33 |
| B. | 63 |
| C. | 37 |
| D. | 36 |
| Answer» C. 37 | |
| 14. |
A coil has a resistance of 4 ohms and an inductance of 2H. It is connected to a 20V dc supply. Calculate the initial value of the voltage across the inductor. |
| A. | 5V |
| B. | 10V |
| C. | 0 V |
| D. | 20V |
| Answer» E. | |
| 15. |
What is the energy stored in the magnetic field if the current in a coil has a constant inductance of L henrys grows at a uniform rate? |
| A. | LI/2 |
| B. | LI2/2 |
| C. | L/2I |
| D. | L/2I2 |
| Answer» C. L/2I | |
| 16. |
A coil has a resistance of 4 ohms and an inductance of 2H. It is connected to a 20V dc supply. Calculate the final value of the voltage across the inductor. |
| A. | 5V |
| B. | 10V |
| C. | 0 V |
| D. | 20V |
| Answer» D. 20V | |
| 17. |
Initially, when the switch in a series RL circuit is closed, the current in the inductor is? |
| A. | Maximum |
| B. | Minimum |
| C. | Zero |
| D. | Infinity |
| Answer» D. Infinity | |
| 18. |
Calculate the number of turns in an inductor with a ferromagnetic core when the inductance is 4000 H, the current changes from 5A to 7A and the flux changes from 760 to 800 Wb. |
| A. | 100 |
| B. | 200 |
| C. | 300 |
| D. | 400 |
| Answer» C. 300 | |
| 19. |
Calculate the change in current in an inductor having inductance 4000H, number of turns is 200 and the flux changes from 760 to 800 Wb. |
| A. | 2A |
| B. | 4A |
| C. | 6A |
| D. | 8A |
| Answer» B. 4A | |
| 20. |
When a ferromagnetic core is inserted into an inductor, what happens to the flux linkage? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 21. |
If tan ? = 10 and the resistance is 2 ohm, calculate the inductive reactance. |
| A. | 10 ohm |
| B. | 20 ohm |
| C. | 30 ohm |
| D. | 40 ohm |
| Answer» C. 30 ohm | |
| 22. |
A laminated steel ring is wound with 200 turns. When the magnetizing current varies between 5 and 7 A, the magnetic flux varies between 760 and 800 Wb. Calculate the inductance of the coil. |
| A. | 40H |
| B. | 4 H |
| C. | 4000H |
| D. | 0.004 H |
| Answer» D. 0.004 H | |
| 23. |
Among the following, which is the right formula for inductance of N turns? |
| A. | L=et/Ni |
| B. | L=N*i *e*t |
| C. | L=Ni/et |
| D. | L=N/iet |
| Answer» B. L=N*i *e*t | |
| 24. |
For a coil having a magnetic circuit of constant reluctance, the flux is ___________ to the current. |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Not related |
| D. | Very large compared to |
| Answer» B. Inversely proportional | |
| 25. |
An induced emf is said to be ________ |
| A. | Inductive |
| B. | Capacitive |
| C. | Resistive |
| D. | Cannot be determined |
| Answer» B. Capacitive | |
| 26. |
What is the unit for inductive reactance? |
| A. | Henry |
| B. | Ohm |
| C. | Farad |
| D. | Volts |
| Answer» C. Farad | |
| 27. |
If the resistance in a circuit is 2 ohm and the impedance is 20 ohm, calculate the power factor. |
| A. | 1/10 |
| B. | 1/20 |
| C. | 1/30 |
| D. | 1/40 |
| Answer» B. 1/20 | |
| 28. |
If the power factor is 1/10 and the value of impedance is 20 ohm, calculate the resistance in the circuit. |
| A. | 1 ohm |
| B. | 2 ohm |
| C. | 3 ohm |
| D. | 4 ohm |
| Answer» C. 3 ohm | |
| 29. |
Among the following, which is the right formula for inductance? |
| A. | L=emf*t/I |
| B. | L=emf/t*I |
| C. | L=emf*I/t |
| D. | L=emf*t*I |
| Answer» B. L=emf/t*I | |
| 30. |
Calculate the resistance in an inductive circuit whose time constant is 2s and the inductance is 10H. |
| A. | 7ohm |
| B. | 10ohm |
| C. | 2ohm |
| D. | 5ohm |
| Answer» E. | |
| 31. |
Calculate the change in flux of an inductor having inductance 4000 H, number of turns is 200 and the current changes from 5A to 7A. |
| A. | 20 Wb |
| B. | 40 Wb |
| C. | 60 Wb |
| D. | 80 Wb |
| Answer» C. 60 Wb | |
| 32. |
The charging time constant of a circuit consisting of an inductor is the time taken for the voltage in the inductor to become __________ % of the initial voltage. |
| A. | 33 |
| B. | 63 |
| C. | 37 |
| D. | 36 |
| Answer» D. 36 | |
| 33. |
Calculate the initial current in an inductor having inductance 4000 H, number of turns is 200 and the flux changes from 760 to 800 Wb. Current changes to 7A. |
| A. | 10A |
| B. | 2A |
| C. | 3A |
| D. | 5A |
| Answer» E. | |
| 34. |
Calculate the final flux in an inductor having inductance 4000 H, number of turns is 200 and the current changes from 5A to 7A. The initial flux is 760 Wb. |
| A. | 200 Wb |
| B. | 400 Wb |
| C. | 600 Wb |
| D. | 800 Wb |
| Answer» E. | |
| 35. |
The unit for inductance is ___________ |
| A. | Ohm |
| B. | Henry |
| C. | A/m |
| D. | A/s |
| Answer» C. A/m | |
| 36. |
If the current changes from 5A to 3A in 2 seconds and the inductance is 10H, calculate the emf. |
| A. | 5V |
| B. | 10V |
| C. | 15V |
| D. | 20V |
| Answer» C. 15V | |
| 37. |
If either the inductance or the rate of change of current is doubled, the induced e.m.f? |
| A. | Remains constant |
| B. | Becomes zero |
| C. | Doubles |
| D. | Becomes half |
| Answer» D. Becomes half | |
| 38. |
For a coil having a magnetic circuit of constant reluctance, if the flux increases, what happens to the current? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 39. |
As the number of turns in the coil increases, what happens to the inductance of the coil? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 40. |
If the current changes from 3A to 5A in 2s and the emf is 10V. Calculate the inductance. |
| A. | 10H |
| B. | 20H |
| C. | 30H |
| D. | 40H |
| Answer» B. 20H | |
| 41. |
If the current changes from 5A to 3A in x sec and inductance is 10H. The emf is 10V, calculate the value of x. |
| A. | 2s |
| B. | 3s |
| C. | 4s |
| D. | 5s |
| Answer» B. 3s | |
| 42. |
Find the value of x if the Mutual inductance is 20H, the inductance of coil 1 is xH and the inductance of coil 2 is 8H. The coupling coefficient is 5. |
| A. | 2H |
| B. | 4H |
| C. | 6H |
| D. | 8H |
| Answer» B. 4H | |
| 43. |
Find the value of x if the Mutual inductance is x H, the inductance of coil 1 is 2H and the inductance of coil 2 is 8H. The coupling coefficient is 5. |
| A. | 10H |
| B. | 20H |
| C. | 16H |
| D. | 15H |
| Answer» C. 16H | |
| 44. |
Find the coupling coefficient if the Mutual inductance is 20H, the inductance of coil 1 is 2H and the inductance of coil 2 is 8H. |
| A. | 5 |
| B. | 20 |
| C. | 2 |
| D. | 8 |
| Answer» B. 20 | |
| 45. |
In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor, inductor etc? |
| A. | Voltage |
| B. | Current |
| C. | Both voltage and current |
| D. | Neither voltage nor current |
| Answer» C. Both voltage and current | |