MCQOPTIONS
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MCQOPTIONS
This section includes 135 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. |
By which law, the direction of induced emf will be identified |
| A. | Faraday’s first law of electromagnetic induction |
| B. | Faraday’s second law of electromagnetic induction |
| C. | Lenz’s law |
| D. | Fleming’s left hand rule |
| Answer» D. Fleming’s left hand rule | |
| 2. |
Flemings left hand rule does not indicate |
| A. | The direction of current flow in the conductor |
| B. | The voltage in the conductor |
| C. | The direction of the magnetic flux |
| D. | The direction motion of the conductor |
| Answer» C. The direction of the magnetic flux | |
| 3. |
An element which stores energy in the form of a magnetic field is |
| A. | Nichrome Varistor |
| B. | Tungsten Resistor |
| C. | Carbon Inductor |
| D. | Eureka Capacitor |
| Answer» D. Eureka Capacitor | |
| 4. |
Hysteresis is the phenomenon of ________ in a magnetic circuit |
| A. | Lagging B behind H |
| B. | Lagging H behind B |
| C. | Setting up constant flux |
| D. | None of these |
| Answer» B. Lagging H behind B | |
| 5. |
________ are loops of electric current induced within conductors by changing magnetic field. |
| A. | Electric currents |
| B. | Eddy currents |
| C. | Berry currents |
| D. | Faulty currents |
| Answer» C. Berry currents | |
| 6. |
In a B-H curve, H represents: |
| A. | Magnetic flux |
| B. | Magnetic field strength |
| C. | Reluctance |
| D. | Magnetic flux density |
| Answer» C. Reluctance | |
| 7. |
The relation between the direction of magnetic flux and the direction of motion of the conductor is _______ |
| A. | Parallel |
| B. | Equal |
| C. | Not related |
| D. | Perpendicular |
| Answer» E. | |
| 8. |
What is the consequence of motor effect? |
| A. | Current |
| B. | Voltage |
| C. | Electromagnetic induction |
| D. | EMF |
| Answer» D. EMF | |
| 9. |
Direction of induced emf is determined by __________ |
| A. | Fleming’s left hand rule |
| B. | Fleming’s right hand rule |
| C. | Faraday’s law |
| D. | Right hand thumb rule |
| Answer» C. Faraday’s law | |
| 10. |
According to Faraday’s laws of electromagnetic induction, an emf is induced in a conductor whenever? |
| A. | The conductor is perpendicular to the magnetic field |
| B. | Lies in the magnetic field |
| C. | Cuts magnetic lines of flux |
| D. | Moves parallel to the magnetic field |
| Answer» D. Moves parallel to the magnetic field | |
| 11. |
The emf induced in a coil having N turns is? |
| A. | e=ϕ/t |
| B. | e=N*ϕ/t |
| C. | e=N*ϕ*t |
| D. | e=N²*ϕ*t |
| Answer» C. e=N*ϕ*t | |
| 12. |
If the intensity of the magnetic field is 100T, the length of the conductor is 10m and the magnitude of force perpendicular to the magnetic field is 10kN, calculate the current in the conductor. |
| A. | 100 A |
| B. | 100 mA |
| C. | 10 A |
| D. | 10 mA |
| Answer» D. 10 mA | |
| 13. |
When the length of the conductor in the current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 14. |
What is the principle of the transformer? |
| A. | Gauss law |
| B. | Coulomb’s law |
| C. | Electromagnetic induction |
| D. | Ampere’s law |
| Answer» D. Ampere’s law | |
| 15. |
The unit for force in a current carrying conductor is _________ |
| A. | Tesla*Ampere*metre |
| B. | Tesla |
| C. | Ampere/metre |
| D. | Ampere*metre |
| Answer» B. Tesla | |
| 16. |
What happens to the current in a coil while accelerating a magnet inside it? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Reverses |
| Answer» B. Decreases | |
| 17. |
If the flow of electric current is parallel to the magnetic field, the force will be? |
| A. | Zero |
| B. | Infinity |
| C. | Maximum |
| D. | Half the original value |
| Answer» B. Infinity | |
| 18. |
The relation between the direction of induced emf and the direction of magnetic flux is _______ |
| A. | Parallel |
| B. | Equal |
| C. | Not related |
| D. | Perpendicular |
| Answer» E. | |
| 19. |
The relation between the direction of induced emf and the direction of motion of the conductor is? |
| A. | Parallel |
| B. | Equal |
| C. | Not related |
| D. | Perpendicular |
| Answer» E. | |
| 20. |
How can a magnetic field be produced? |
| A. | Using a permanent magnet |
| B. | Electric current |
| C. | Using a temporary magnet |
| D. | Using a permanent magnet or electric current |
| Answer» E. | |
| 21. |
North pole induces __________ |
| A. | Clockwise current |
| B. | Anti-clockwise current |
| C. | Zero current |
| D. | Infinite current |
| Answer» C. Zero current | |
| 22. |
According to ____________________ induced emf oppose the cause due to which they are produced. |
| A. | Newton’s law |
| B. | Lenz law |
| C. | Faraday’s law |
| D. | Coulomb’s law |
| Answer» C. Faraday’s law | |
| 23. |
The total number of magnetic field lines passing through an area is termed as? |
| A. | Voltage |
| B. | EMF |
| C. | Magnetic flux |
| D. | Magnetic flux density |
| Answer» D. Magnetic flux density | |
| 24. |
Can we see magnetic flux lines? |
| A. | Yes |
| B. | No |
| C. | Depends on the strength of the field |
| D. | Only when the field strength is very large |
| Answer» C. Depends on the strength of the field | |
| 25. |
What is the expression for force in a current carrying conductor? |
| A. | F=K/r² |
| B. | F=Kq/r² |
| C. | F=Kq₁q₂/r² |
| D. | F=Kq₁q₂/r |
| Answer» D. F=Kq₁q₂/r | |
| 26. |
Force in a conductor is__________ to the product of the charges. |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Not related |
| D. | Cannot be determined |
| Answer» B. Inversely proportional | |
| 27. |
The current in a solenoid is 30A, the number of turns per unit length is 500 turns per metre. Calculate the magnetic field if the core is air. |
| A. | 18.84T |
| B. | 18.84mT |
| C. | 1.84T |
| D. | 1.84mT |
| Answer» C. 1.84T | |
| 28. |
The magnetic field of the solenoid is 18.84mT, the number of turns per unit length is 500 turns per metre. Calculate the current if the core is air. |
| A. | 300A |
| B. | 30A |
| C. | 3A |
| D. | 300mA |
| Answer» C. 3A | |
| 29. |
What happens to the magnetic field in the solenoid when the length of the solenoid increases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» C. Remains constant | |
| 30. |
What is the formula for the magnetic field due to a solenoid? |
| A. | μnI |
| B. | μn² |
| C. | μNI |
| D. | μN²I² |
| Answer» B. μn² | |
| 31. |
If the radius of the current carrying conductor increases, what is the effect on the force? |
| A. | increases |
| B. | decreases |
| C. | remain same |
| D. | become zero |
| Answer» D. become zero | |
| 32. |
The magnetic field strength of a solenoid can be increased by inserting which of the following materials as the core? |
| A. | Copper |
| B. | Silver |
| C. | Iron |
| D. | Aluminium |
| Answer» D. Aluminium | |
| 33. |
According to Flemming’s left hand rule, the thumb denotes? |
| A. | Direction of magnetic field |
| B. | Direction of current |
| C. | Direction of force |
| D. | Direction of force as well as current |
| Answer» D. Direction of force as well as current | |
| 34. |
According to Flemming’s left hand rule, the middle finger denotes? |
| A. | Direction of magnetic field |
| B. | Direction of current |
| C. | Direction of force |
| D. | Direction of force as well as current |
| Answer» C. Direction of force | |
| 35. |
Inside the magnet, field lines travel from? |
| A. | North to south |
| B. | South to north |
| C. | West to east |
| D. | East to west |
| Answer» C. West to east | |
| 36. |
Lines of magnetic flux which are parallel and in the same direction __________ each other. |
| A. | Attract |
| B. | Repel |
| C. | Intersect |
| D. | Cancel |
| Answer» C. Intersect | |
| 37. |
Do magnetic flux lines intersect? |
| A. | Yes |
| B. | No |
| C. | Depends on the situation |
| D. | Cannot be determined |
| Answer» C. Depends on the situation | |
| 38. |
Magnetic field lines seek the path of __________ resistance. |
| A. | Maximum |
| B. | Minimum |
| C. | Infinite |
| D. | Zero |
| Answer» C. Infinite | |
| 39. |
According to _________________ induced emf is equal to rate of change of magnetic flux. |
| A. | Newton’s law |
| B. | Lenz law |
| C. | Faraday’s law |
| D. | Coulomb’s law |
| Answer» D. Coulomb’s law | |
| 40. |
What does emf stand for? |
| A. | Electronic magnetic force |
| B. | Electromotive force |
| C. | Electromagnetic force |
| D. | Electromated force |
| Answer» C. Electromagnetic force | |
| 41. |
Calculate the force between two charges having magnitude 3nC and 2nC separated by a distance of 2micro m. |
| A. | 13.5N |
| B. | 13.5kN |
| C. | 1.35N |
| D. | 1.35kN |
| Answer» C. 1.35N | |
| 42. |
Magnetic field lines form _________ loops from pole to pole. |
| A. | Open |
| B. | Closed |
| C. | Branched |
| D. | Either closed or branched |
| Answer» C. Branched | |
| 43. |
Weakest force in nature is __________ |
| A. | Electric force |
| B. | Gravitational force |
| C. | Weak force |
| D. | Magnetic force |
| Answer» B. Gravitational force | |
| 44. |
When the distance of operation between the two conductors increases, what happens to the force between the two conductors? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» C. Remains the same | |
| 45. |
What happens to the magnetic field in the solenoid when the number of turns increases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 46. |
Which of the following is used to determine the direction of magnetic field in a current carrying conductor? |
| A. | Left hand thumb rule |
| B. | Right hand thumb rule |
| C. | Right hand palm rule |
| D. | Left hand palm rule |
| Answer» C. Right hand palm rule | |
| 47. |
Magnetic field lines ___________ at the north pole. |
| A. | Emerge |
| B. | Converge |
| C. | Neither emerge nor converge |
| D. | Either emerge or converge |
| Answer» B. Converge | |
| 48. |
Field lines move from __________ |
| A. | North to south |
| B. | South to north |
| C. | West to east |
| D. | East to west |
| Answer» B. South to north | |
| 49. |
According to Flemming’s left hand rule, the index finger denotes? |
| A. | Direction of magnetic field |
| B. | Direction of current |
| C. | Direction of force |
| D. | Direction of force as well as current |
| Answer» B. Direction of current | |
| 50. |
An E.M.F. can be induced by _________ |
| A. | Change in the magnetic field only |
| B. | Change in the area of cross section only |
| C. | Change in angle between magnetic field and area only |
| D. | Change in the magnetic field, area or angle between them |
| Answer» E. | |